Patrick McAlee is a dedicated and highly-skilled, aerobatic pilot who mixes his intense personality with his hardcore passion to produce a unique and entertaining product unlike any other. During his routine, Patrick executes his maneuvers to a choreographed music playlist all while practicing precision, professionalism and safety. Since its first inception, Pat’s dream has led him to fly shows all across the nation. He has logged over 1,000 aerobatic hours and over 10,000 hours in over thirty different aircraft. Before making the transition to airshows, Patrick flew in aerobatic competitions for 5 years; he has been performing shows for the past three. Currently Patrick strives to the best entertainer and performer for past and future generations.
In this age of flight directors, flight management computers and autopilots, it's easy to get into the mode of letting the automation do all the work. And that's good if it enhances safety.
But it's really important to keep your basic stick-and-rudder skills current, and that includes flying an ILS approach without any of the bells and whistles.
So let's discuss a hand-flown ILS flown WITHOUT a flight director or autopilot.
The key to successfully, easily flying a manual ILS is preparation. First, study the approach chart, so you have a complete understanding of all the facilities involved. Take a look at the distance from the glide slope intercept point and the outer marker (if it's part of the approach) to the runway. Examine the glide slope angle, and note if it is OTHER than the standard 3-degrees.
Now, as close to your ETE as possible, get the destination weather. Ideally, this will be right before you prepare for your approach. Now, take out your E6B computer and calculate your groundspeed and wind correction for the approach. If you can't remember how to do this, listen to episode RFT 146 and PRACTICE with your E6B until you can solve a wind problem in under 30 seconds. The only thing that makes this calculation different from what you do with the E6B for your cross-country planning planning is that you will be using only MAGNETIC winds (from ATIS), rather than winds oriented to true north.
When entering your true airspeed into your E6B, you need to know your true airspeed (TAS), based on your indicated airspeed (IAS). You can use the calculator side of your E6B to determine TAS (RFT 148), but, as a guide, TAS increases 2 percent for every 1000 feet above sea level. So, if you are flying your approach at 120 KIAS at an average elevation of 6000 feet MSL, your TAS is [120 + 120(.02X6)] = 120 + 14 = 134. THAT's the number you use for TAS in your E6B.
Once you have calculated your GS and WCA, calculate your descent rate and heading to keep yourself on the localizer and glide slope. Now that you have your groundspeed, you can calculate your 3-degree descent rate by multiplying HALF your groundspeed times 10. In the example above, our descent rate will be 670 feet per minute (FPM).
All of this, of course is simply a guide to get you into the ballpark for an easy, stabilized approach. But if you start out with these values, you will only need minimal corrections to keep your LOC and GS centered.
The only thing left to do when you get to approach minimums and visually acquire the runway is DON'T CHANGE ANYTHING. If you have a crosswind, the runway will not be DIRECTLY in front of you, it will be offset by your WCA.
From the Fighter Sweep website: Michael Rutledge is a 30 active duty year veteran with almost 12 years enlisted including a 3-year assignment as a Helicopter Rescue Swimmer, followed by 8 years as a Navy SEAL. While at SEAL Team One, he served as an M-60 gunner, Air Operations Specialist, Advanced Training Instructor and Platoon Leading Petty Officer. In 2002, Mike transferred to the U.S. Army to become a Warrant Officer Aviator. Upon graduation from flight school, he was directly assigned to the "Night Stalkers" of the 160th Special Operations Aviation Regiment (Airborne) where he served for 13 years as an MH-47G pilot. His current assignment is the Commander of the West Point Flight Detachment at the United States Military Academy. Mike is also an accomplished aviation author, consultant, speaker, and airshow pilot specializing in vintage WWII aircraft, as well as spending his summers flying crop dusters in the Midwest.
The Doolittle Raid, also known as the Tokyo Raid, on Saturday, April 18, 1942, was an air raid by the United States on the Japanese capital Tokyo and other places on the island of Honshu during World War II, the first air operation to strike the Japanese Home Islands. It demonstrated that the Japanese mainland was vulnerable to American air attack, served as retaliation for the attack on Pearl Harbor, and provided an important boost to American morale. The raid was planned and led by Lieutenant Colonel James Doolittle of the United States Army Air Forces.
Sixteen B-25B Mitchell medium bombers were launched without fighter escort from the U.S. Navy's aircraft carrierUSS Hornet (CV-8) deep in the Western Pacific Ocean, each with a crew of five men. The plan called for them to bomb military targets in Japan, and to continue westward to land in China—landing a medium bomber on Hornet was impossible. The bombing raid killed about 50 people, including civilians, and injured 400. Fifteen aircraft reached China, but all crashed, while the 16th landed at Vladivostok in the Soviet Union. Of the 80 crew members, 77 initially survived the mission. Eight airmen were captured by the Japanese Army in China; three of those were later executed. The B-25 that landed in the Soviet Union was confiscated, with its crew interned for more than a year before being allowed to "escape" via Soviet-occupied Iran. Fourteen complete crews of five, except for one crewman who was killed in action, returned either to the United States, or to American forces.[
After the raid, the Japanese Army conducted a massive sweep through the eastern coastal provinces of China, in an operation now known as the Zhejiang-Jiangxi campaign, searching for the surviving American airmen and inflicting retribution on the Chinese who aided them, in an effort to prevent this part of China from being used again for an attack on Japan.
The raid caused negligible material damage to Japan, but its consequences had major psychological effects. In the United States, it raised morale. In Japan, it raised doubt about the ability of military leaders to defend the home islands, but the bombing and strafing of civilians also steeled the resolve of many to gain retribution and was exploited for propaganda purposes.[ It also contributed to Admiral Isoroku Yamamoto's decision to attack Midway Island in the Central Pacific—an attack that turned into a decisive strategic defeat of the Imperial Japanese Navy (IJN) by the U.S. Navy in the Battle of Midway. The consequences were most severely felt in China, where Japanese reprisals cost an estimated 250,000 lives.[
Doolittle, who initially believed that the loss of all his aircraft would lead to his court-martial, received the Medal of Honor and was promoted two ranks to brigadier general.
Doolittle and Hornet skipper Captain Marc Mitscher decided to launch the B-25s immediately—10 hours early and 170 nautical miles (310 km; 200 mi) farther from Japan than planned. After re-spotting to allow for engine start and run-ups, Doolittle's aircraft had 467 feet (142 m) of takeoff distance. Although none of the B-25 pilots, including Doolittle, had ever taken off from a carrier before, all 16 aircraft launched safely between 08:20 and 09:19. The B-25s then flew toward Japan, most in groups of two to four aircraft, before flying singly at wave-top level to avoid detection.[
The aircraft began arriving over Japan about noon Tokyo time, six hours after launch, climbed to 1,500 feet (460 m) and bombed 10 military and industrial targets in Tokyo, two in Yokohama, and one each in Yokosuka, Nagoya, Kobe, and Osaka. Although some B-25s encountered light antiaircraft fire and a few enemy fighters (made up of Ki-45s and prototype Ki-61s, the latter being mistaken for Bf 109s) over Japan, no bomber was shot down. Only the B-25 of 1st Lt. Richard O. Joyce received any battle damage, minor hits from antiaircraft fire. B-25 No. 4, piloted by 1st Lt. Everett W. Holstrom, jettisoned its bombs before reaching its target when it came under attack by fighters after its gun turret malfunctioned.[
The Americans claimed to have shot down three Japanese fighters – one by the gunners of the Whirling Dervish, piloted by 1st Lt. Harold Watson, and two by the gunners of the Hari Kari-er, piloted by 1st Lt. Ross Greening. Many targets were strafed by the bombers' nose gunners. The subterfuge of the simulated gun barrels mounted in the tail cones was described afterwards by Doolittle as effective, in that no airplane was attacked from directly behind.[
Fifteen of the 16 aircraft then proceeded southwest off the southeastern coast of Japan and across the East China Sea toward eastern China. One B-25, piloted by Captain Edward J. York, was extremely low on fuel, and headed instead for the Soviet Union rather than be forced to ditch in the middle of the East China Sea. Several fields in Zhejiang province were supposed to be ready to guide them in using homing beacons, then recover and refuel them for continuing on to Chongqing, the wartime Kuomintang capital. The primary base was at Zhuzhou, toward which all the aircraft navigated, but Halsey never sent the planned signal to alert them, apparently because of a possible threat to the task force.[
The raiders faced several unforeseen challenges during their flight to China: night was approaching, the aircraft were running low on fuel, and the weather was rapidly deteriorating. None would have reached China if not for a tail wind as they came off the target, which increased their ground speed by 25 kn (46 km/h; 29 mph) for seven hours. The crews realized they would probably not be able to reach their intended bases in China, leaving them the option of either bailing out over eastern China or crash-landing along the Chinese coast.[
All 15 aircraft reached the Chinese coast after 13 hours of flight and crash-landed or the crews bailed out. One crewman, 20-year-old Corporal Leland D. Faktor, flight engineer/gunner with 1st Lt. Robert M. Gray, was killed during his bailout attempt over China, the only man in that crew to be lost. Two crews (10 men) were missing. The 16th aircraft, commanded by Capt. Edward York (eighth off—AC #40-2242) flew to the Soviet Union and landed 40 miles (65 km) beyond Vladivostok at Vozdvizhenka, where their B-25 was confiscated and the crew interned.
Although York and his crew were treated well, diplomatic attempts to return them to the United States ultimately failed, as the Soviet Union was not at war with Japan and therefore obligated under international law to intern any combatants found on its soil. Eventually, they were relocated to Ashkhabad, 20 miles (32 km) from the Iranian border, and York managed to "bribe" a smuggler, who helped them cross the border into Iran, which at the time was under British-Soviet occupation. From there, the Americans were able to reach a nearby British consulate on 11 May 1943.[ The smuggling was actually staged by the NKVD, according to declassified Soviet archives, because the Soviet government was unable to repatriate them legally in the face of the neutrality pact with Japan and unwilling to openly flout its treaty obligations with Japan in light of the fact that Vladivostok and the rest of the Soviet Far East were essentially defenseless in the face of any potential Japanese retaliation. Nevertheless, by the time of the American aircrew's "escape" from Soviet internment, Japan's armed forces were clearly on the defensive and drawing down their strength in Manchuria in order to reinforce other fronts. Meanwhile, Soviet forces had gained the strategic initiative in Europe. Even if the Americans' "escape" managed to gain significant attention in Tokyo, it was by then thought extremely unlikely that Japan would respond with any sort of military retaliation.
Doolittle and his crew, after parachuting into China, received assistance from Chinese soldiers and civilians, as well as John Birch, an American missionary in China. As did the others who participated in the mission, Doolittle had to bail out, but he landed in a heap of dung (saving a previously injured ankle from breaking) in a paddy in China near Quzhou. The mission was the longest ever flown in combat by the B-25 Mitchell medium bomber, averaging about 2,250 nautical miles (4,170 km).
The Doolittle Raiders held an annual reunion almost every year from the late 1940s to 2013. The high point of each reunion was a solemn, private ceremony in which the surviving Raiders performed a roll call, then toasted their fellow Raiders who had died during the previous year. Specially engraved silver goblets, one for each of the 80 Raiders, were used for this toast; the goblets of those who had died were inverted. Each Raider's name was engraved on his goblet both right side up and upside down. The Raiders drank a toast using a bottle of cognac that accompanied the goblets to each Raider reunion.[ In 2013, the remaining Raiders decided to hold their last public reunion at Fort Walton Beach, Florida, not far from Eglin Air Force Base, where they trained for the original mission. The bottle and the goblets had been maintained by the United States Air Force Academy on display in Arnold Hall, the cadet social center, until 2006. On 19 April 2006, these memorabilia were transferred to the National Museum of the United States Air Force at Wright-Patterson AFB, Ohio.[
On 18 April 2013, a final reunion for the surviving Raiders was held at Eglin Air Force Base, with Robert Hite the only survivor unable to attend.[
The "final toast to fallen comrades" by the surviving raiders took place at the NMUSAF on 9 November 2013, preceded by a B-25 flyover, and was attended by Richard Cole, Edward Saylor, and David Thatcher.
There are those who take uncertain steps on IED-ridden battlefields, take to contested waterways, and fly unguarded skies as dangerous threats lurk below. Protecting freedom is how over a million active-duty military men and women support their families.
These Brothers in Arms fight and die, for each other, and for those who can’t fight for themselves.
Since the Global War on Terror began on September 11, 2001, America’s warriors have faced evil on a heightened scale and risked life and limb to quell a hate-filled enemy who does not respect human life.
It was the remarkable esprit de corps, the history and its intimacy as an organization that drew Lt. Col. Stephen Mount to the Marine Corps in 1996. Mount, severely wounded in Iraq, 2004, was given command June 30th, 2016, of Wounded Warrior Battalion-West (WWBn-W), located at Camp Pendleton Calif., now in its tenth year of operation.
SAN DIEGO, 2017. Lt. Col. Stephen Mount at Wounded Warrior Battalion-West Headquarters Complex, Camp Pendleton, Calif. Photo by Jeanne McKinney for CommDigiNews
There, he is committed to the successful recovery of each Marine assigned to his care.
“I try to be the kind of guy who absorbs the blows and then just figures it out,” said Mount. He chooses to not make drastic decisions right away and let things kind of simmer. “Let’s just figure this out together and go forward,” he tells his Marines.
Absorbing the blows of active-duty service prefaced Mount’s first historic experiences as a UH-1N (Huey) pilot with Helicopter Marine Light Attack Squadron (HMLA)-169. His first deployment in 2001, as part of the Aviation Combat Element (ACE) with the 15th Marine Expeditionary Unit (MEU), took him to Darwin, training with the Australians.
After the twin towers and the Pentagon were hit and hijacked Flight 93 crashed into a Pennsylvania field, the 15th MEU was redirected to the Arabian Sea.
“It was a very anxious and excitable kind of feeling that we were out in the Arabian Sea and the country had been attacked and more than likely we were going to do something about it.”
He was on the flight deck of his ship, watching the first U.S. missile strikes launched in the first round of attacks.
The guided-missile destroyer USS Porter (DDG 78) conducts strike operations against Syria while in the Mediterranean Sea, April 7, 2017. U.S. Navy Photo
Mount’s squadron was flown into the Afghanistan desert and had to scrape out a “pseudo desert airstrip”, that Mount said, “[had] some old abandoned buildings they probably used to run drugs out of.”
By end of November 2001, that pseudo desert airstrip had a name: Camp Rhino, the first U.S. Forward Operating Base (FOB) established in Afghanistan during Operation Enduring Freedom. They went in there with 1st Battalion, 1st Marines under Colonel Brett Bourne.
“It wasn’t a Forward Operating Base in the traditional sense. They dug holes in the sand—that was our perimeter. Then we built ourselves fueling points.”
Mount called flying into the middle of the desert in a foreign country and doing good things “fun times.” The first night he slept by the skid of his aircraft.
“None of our aircraft have any gas. We don’t know what is going to happen. You’re a young man—that’s what you do … it was exciting.”
A sense of finality prevailed. “I can’t get back to the ship until someone lands and gives me more gas,” said Mount.
There was already fighting in the North which had fallen to the Taliban. Gas arrived on C-130’s and U.S. troops followed Hamid Karzai and his boys into Kandahar and then Lashkar Gah, Helmand Province, establishing an airfield at Kandahar.
Mount explains, “The big offensive against the Taliban hadn’t started yet; not until we got there and Karzai could have some assurances that America is here to help you.”
A future home for wounded warriors would come into play as the Global War on Terrorism kicked off.
Operation Iraqi Freedom I, the initial invasion of Iraq, saw U.S. and Coalition Forces quickly defeat Suddam Hussein’s Army. Upheaval and more harrowing times ensued. During Operation Iraqi Freedom II, 2004, the U.S. sent troops in to support the newly-established Provisional Iraqi Government, trying to stabilize the country and protect Iraqi citizens, threatened by growing violence and complexity.
The unpreparedness for the number of casualties and pace of operations going forward took a toll on the military healthcare system. For Mount and others deployed to Iraq and Afghanistan, there was no centralized operation to care for the numbers of wounded warriors too well to be kept in-patient, but not well enough to go back to their units or deploy.
A charismatic yet disenchanted Shiite Muslim cleric, Muqtada al Sadr, spread insurrection around Iraq, in opposition to the new government. His die-hard followers formed heavily-armed militias or al-Sadr’s Mahdi Army, who rained bullets and shrapnel on U.S. and Coalition forces.
Al-Sadr’s militia was battered. A conditional truce was made with him for An Najaf and al-Kufa (his home territory) that restricted Coalition forces entry. Al-Sadr used fear and oppression to reinforce control and conducted assassinations, kidnappings, and torture of police and government officials.
The militia would then hide where Coalition forces could not pursue them.
Mount and his flight crew deployed with Colonel Anthony M. Haslam’s 11th MEU and Lt. Col. John L. Mayer’s Landing Team, 1st Battalion, 4th Marines (1/4) in the summer of ‘04.
The MEU took over the battlespace in and around An Najaf by August, in soaring desert temperatures and volatile instability.
“There was an old holy cemetery [Wadi al-Salam],” said Mount, then a Captain. “They [al-Sadr’s militia] would use the crypts and catacombs to build smuggled weapons and launch attacks out to the Iraqi police forces.”
Mount and his crew couldn’t fly over or attack the holy burial grounds or the Imam Ali Mosque.
“There was a police station in Revolutionary Circle…they would lob mortars and shoot at us [every night]. By the time we’d get to our birds and fly over there, they’d [retreat] back to the cemetery,” said Mount.
The night of August 3rd, enough was enough for MEU commanders. A Quick Reaction Force (QRF) and Combined Anti-Armor-Team (CAAT) were summoned to reinforce the police station. American forces came under attack on the main highway that runs by the cemetery, from where al-Sadr’s militia was positioned. Mount’s aircraft section suppressed the threat, allowing our forces to run through.
Again, they were called out.
“We spun up one Huey and two Cobras,” said Mount, who piloted the lead Huey with Co-pilot Drew Turner, Crew Chief Pat Burgess, and Gunner Lance Corporal Teodro Naranjo. Mount’s section circled, seeking to take out a mortar pit that an ‘observer’ had seen by an old gas station near the cemetery.
He missed seeing it on the first “poke your head out, shoot, and get back,” attempt, but on a second circle, further out, the Huey’s number one engine and Mount got a fiery hit.
“I clenched and reflexed, bringing our nose way up and lost all our air speed,” remembered Mount, crediting Turner for landing the battered helicopter right-side up instead of upside down, which would have killed them.
A rifle round entered Mount’s left temple and went behind the bridge of his nose, in front of an eye through the socket and exited the right temple.
“I remember Pat Burgess…dragging me off the skid behind some bricks – waiting there for the guys – a Corpsman ran up and jabbed with morphine.”
“Captain Andrew Turner, ran into the [nearby medical] clinic and came out with an Iraqi physician. Mount had been holding a compress to his wound while trying to chamber a round in his pistol with his teeth. His crew chief, Staff Sergeant Patrick O. Burgess, finally gave him a needed hand in loading.”
There have been numerous air carrier accidents in which the crew attempted takeoff without the leading and trailing edge flaps extended to the takeoff position. Unlike many general aviation airplanes, large turbojet aircraft require high-lift devices (leading and trailing edge flaps and slats) for the airplane to safely get airborne. In some of these accidents, the Takeoff Warning System (TOWS) was intentionally disabled, preventing the crew from receiving a warning of incorrect airplane configuration.
Here are notable accidents resulting in 746 fatalities:
1974 Lufthansa flight 540, B747, 59 fatalities
1987 Northwest 255, MD 82, 150 fatalities
1988 Delta 1411, B727-200, 14 fatalities
1999 LAPA Flight 3142, B737-200, 65 fatalities
2005 Mandala Airlines 91, B737-200, 144 fatalities
2008 Spanair 5022 - MD 82, 154 fatalities
In every case, if the flight crews had performed their normal pre-takeoff checks, the accidents would have been averted. It is essential that all crew members actually confirm every item on the appropriate checklist.
As an additional mnemonic, many pilots will perform a FEATS check before every takeoff: Flaps, EPRs, Airspeed bugs, Trim, Speed brake.
Scott A. Huesing is a proven combat leader. He is a retired United States Marine Corps Infantry Major with 24 years of honorable service, both enlisted and as a commissioned officer. His career spanned 10 deployments to over 60 countries worldwide. Throughout his numerous deployments to Iraq, Afghanistan, and the Horn of Africa he planned, led, and conducted hundreds of combat missions under some of the most austere and challenging conditions.
Scott is a published author since 2005. His bestselling book, Echo in Ramadi, (Regnery, 2018) is a snapshot in time that changed the face of operations on the battlefield; a captivating story of Echo Company, 2d Battalion, 4th Marines during the Second Battle of Ramadi in support of the Multi National Forces Surge Strategy in 2006. His true-life account provides keen insights into what may be an unfamiliar world to readers, but very familiar to those, like Scott, who lived it and endured this historic fight. Echo in Ramadi was written to honor the sacrifices and spirit of his Marines and the families they supported. It not simply a war story—it is about the people and the power of human connection that speaks about leadership, team-building, and overcoming adversity under the toughest conditions.
Scott is an expert contributor and has written articles, editorials, and scholarly pieces for USA Today, Fox News Channel, Entercom, The Marine Corps Gazette, Military Times, Townhall, and The Daily Signal. He has been an author for the U.S. Marine Corps doctrine shaping the future of training within the world’s most elite branch of service. He is the creative author for the standard operating procedures for Marine Expeditionary Units, America’s first response force, with The Lightning Press.
Scott is a formally trained public speaker with 25 years of experience in both the military and private sector. He has spoken to audiences as large as 2,000 conveying his thoughts, intent, and goals to motivate listeners. Scott’s natural, outgoing style allows him to connect with audiences to share his experience. Scott dedicates his time to travel to military bases, college programs, veteran organizations, non-profit organizations, corporate leadership conferences, Gold Star Family events, and a multitude of venues to share the story of his epic journey and struggles. He is continually sought out to speak on leadership and his combat experiences—and the importance of writing about them.
Scott is the Executive Director of Save the Brave, a certified non-profit that connects Veterans through outreach programs—their mission is staying proactive to the needs of the Veterans they serve. He is also the President of the 2d Battalion, 4th Marines Association, a non-profit that helps Veterans and active duty Marines.
On the night of 1 July 2002, Bashkirian Airlines Flight 2937, a Tupolev Tu-154 passenger jet, and DHL Flight 611, a Boeing 757 cargo jet, collided in mid-air over Überlingen, a southern German town on Lake Constance. All 69 passengers and crew aboard the Tupolev and the two crew members of the Boeing were killed.
The official investigation by the German Federal Bureau of Aircraft Accident Investigation (German: Bundesstelle für Flugunfalluntersuchung, (BFU)) identified as the main cause of the collision a number of shortcomings on the part of the Swiss air traffic control service in charge of the sector involved, and also ambiguities in the procedures regarding the use of TCAS, the on-board aircraft collision avoidance system.
A year and a half after the crash, on 24 February 2004, Peter Nielsen, the air traffic controller on duty at the time of the collision, was murdered in an apparent act of revenge by Vitaly Kaloyev, a Russian citizen who had lost his wife and two children in the accident.
Bashkirian Airlines Flight 2937 was a chartered flight from Moscow, Russia, to Barcelona, Spain, carrying sixty passengers and nine crew. Forty-five of the passengers were Russian schoolchildren from the city of Ufa in Bashkortostan on a school trip organised by the local UNESCO committee to the Costa Dorada area of Spain. Most of the parents of the children were high-ranking officials in Bashkortostan. One of the fathers was the head of the local UNESCO committee.
The aircraft, a Tupolev Tu-154M registered as RA-85816, was piloted by an experienced Russian crew: 52-year-old Captain Alexander Mihailovich Gross (Александр Михайлович Гросс) and 40-year-old First Officer Oleg Pavlovich Grigoriev (Олег Павлович Григорьев). The captain had more than 12,000 flight hours to his credit. Grigoriev, the chief pilot of Bashkirian Airlines, had 8,500 hours of flying experience and his task was to evaluate Captain Gross's performance throughout the flight. 41-year-old Murat Ahatovich Itkulov (Мурат Ахатович Иткулов), a seasoned pilot with close to 7,900 flight hours who was normally the first officer, did not officially serve on duty due to this being the captain's assessment flight. 50-year-old Sergei Gennadyevich Kharlov, a flight navigator with approximately 13,000 flight hours, and 37-year-old Flight Engineer Oleg Irikovich Valeev, who had almost 4,200 flight hours, joined the three pilots in the cockpit.
DHL Flight 611, a Boeing 757-23APF cargo aircraft registered as A9C-DHL, had originated in Bahrain and was being flown by two Bahrain-based pilots, 47-year-old British Captain Paul Phillips and 34-year-old Canadian First Officer Brant Campioni. Both pilots were very experienced — the captain had logged close to 12,000 flight hours and the first officer had accumulated more than 6,600 flight hours. At the time of the accident, the aircraft was en route from Bergamo, Italy, to Brussels, Belgium.
The two aircraft were flying at flight level 360 (36,000 feet, 10,973 m) on a collision course. Despite being just inside the German border, the airspace was controlled from Zürich, Switzerland, by the private Swiss airspace control company Skyguide. The only air traffic controller handling the airspace, Peter Nielsen, was working two workstations at the same time. Partly due to the added workload, and partly due to delayed radar data, he did not realize the problem in time and thus failed to keep the aircraft at a safe distance from each other. Less than a minute before the accident he realised the danger and contacted Flight 2937, instructing the pilot to descend by a thousand feet to avoid collision with crossing traffic (Flight 611). Seconds after the Russian crew initiated the descent, their traffic collision avoidance system (TCAS) instructed them to climb, while at about the same time the TCAS on Flight 611 instructed the pilots of that aircraft to descend. Had both aircraft followed those automated instructions, the collision would not have occurred.
Flight 611's pilots on the Boeing jet followed the TCAS instructions and initiated a descent, but could not immediately inform Nielsen because the controller was dealing with Flight 2937. About eight seconds before the collision, Flight 611's descent rate was about 2,400 feet per minute (12 m/s), not quite as rapid as the 2,500 to 3,000 ft/min (13 to 15 m/s) range advised by that jet's TCAS; as for the Tupolev, the pilot disregarded his jet's TCAS instruction to climb, having already commenced his descent as instructed by the controller. Thus, both planes were now descending.
Unaware of the TCAS-issued alerts, Nielsen repeated his instruction to Flight 2937 to descend, giving the Tupolev crew incorrect information as to the position of the DHL plane (telling them that the Boeing was to the right of the Tupolev when it was in fact to the left).
The aircraft collided at 23:35:32 local time, at almost a right angle at an altitude of 34,890 feet (10,630 m), with the Boeing's vertical stabilizer slicing completely through Flight 2937's fuselage just ahead of the Tupolev's wings. The Tupolev broke into several pieces, scattering wreckage over a wide area. The nose section of the aircraft fell vertically, while the tail section with the engines continued, stalled, and fell. The crippled Boeing, now with 80% of its vertical stabilizer lost, struggled for a further seven kilomters (four miles) before crashing into a wooded area close to the village of Taisersdorf at a 70-degree downward angle. Each engine ended up several hundred meters away from the main wreckage, and the tail section was torn from the fuselage by trees just before impact. All 69 people on the Tupolev, and the two on board the Boeing, died.
The stability of the atmosphere depends on its ability to
resist vertical motion. A stable atmosphere makes vertical
movement difficult, and small vertical disturbances dampen
out and disappear. In an unstable atmosphere, small vertical air
movements tend to become larger, resulting in turbulent airflow
and convective activity. Instability can lead to significant
turbulence, extensive vertical clouds, and severe weather.
Rising air expands and cools due to the decrease in air
pressure as altitude increases. The opposite is true of
descending air; as atmospheric pressure increases, the
temperature of descending air increases as it is compressed.
Adiabatic heating and adiabatic cooling are terms used to
describe this temperature change.
The adiabatic process takes place in all upward and
downward moving air. When air rises into an area of lower
pressure, it expands to a larger volume. As the molecules
of air expand, the temperature of the air lowers. As a result,
when a parcel of air rises, pressure decreases, volume
increases, and temperature decreases. When air descends,
the opposite is true. The rate at which temperature decreases
with an increase in altitude is referred to as its lapse rate.
As air ascends through the atmosphere, the average rate of
temperature change is 2 °C (3.5 °F) per 1,000 feet.
Since water vapor is lighter than air, moisture decreases air
density, causing it to rise. Conversely, as moisture decreases,
air becomes denser and tends to sink. Since moist air cools
at a slower rate, it is generally less stable than dry air since
the moist air must rise higher before its temperature cools
to that of the surrounding air. The dry adiabatic lapse rate
(unsaturated air) is 3 °C (5.4 °F) per 1,000 feet. The moist
adiabatic lapse rate varies from 1.1 °C to 2.8 °C (2 °F to
5 °F) per 1,000 feet.
The combination of moisture and temperature determine the
stability of the air and the resulting weather. Cool, dry air
is very stable and resists vertical movement, which leads to
good and generally clear weather. The greatest instability
occurs when the air is moist and warm, as it is in the tropical
regions in the summer. Typically, thunderstorms appear on
a daily basis in these regions due to the instability of the
As air rises and expands in the atmosphere, the temperature
decreases. There is an atmospheric anomaly that can occur;
however, that changes this typical pattern of atmospheric
behavior. When the temperature of the air rises with altitude, a
temperature inversion exists. Inversion layers are commonly
shallow layers of smooth, stable air close to the ground. The
temperature of the air increases with altitude to a certain
point, which is the top of the inversion. The air at the top
of the layer acts as a lid, keeping weather and pollutants
trapped below. If the relative humidity of the air is high, it
can contribute to the formation of clouds, fog, haze, or smoke
resulting in diminished visibility in the inversion layer.
Surface-based temperature inversions occur on clear, cool
nights when the air close to the ground is cooled by the
lowering temperature of the ground. The air within a few
hundred feet of the surface becomes cooler than the air above
it. Frontal inversions occur when warm air spreads over a
layer of cooler air, or cooler air is forced under a layer of
From AC 006B:
Vertical Motion Effects on an Unsaturated Air Parcel. As a bubble or parcel of air ascends (rises), it moves into an area of lower pressure (pressure decreases with height). As this occurs, the parcel expands. This requires energy, or work, which takes heat away from the parcel, so the air cools as it rises. This is called an adiabatic process. The term adiabatic means that no heat transfer occurs into, or out of, the parcel. Air has low thermal conductivity, so transfer of heat by conduction is negligibly small.
The rate at which the parcel cools as it is lifted is called the lapse rate. The lapse rate of a rising, unsaturated parcel (air with relative humidity less than 100 percent) is approximately 3 °C per 1,000 feet (9.8 °C per kilometer). This is called the dry adiabatic lapse rate. This means for each 1,000-foot increase in elevation, the parcel’s temperature decreases by 3 °C. Concurrently, the dewpoint decreases approximately 0.5 °C per 1,000 feet (1.8 °C per kilometer). The parcel’s temperature-dewpoint spread decreases, while its relative humidity increases.
This process is reversible if the parcel remains unsaturated and, thus, does not lose any water vapor. A descending (subsiding) air parcel compresses as it moves into an area of higher pressure. The atmosphere surrounding the parcel does work on the parcel, and energy is added to the compressed parcel, which warms it. Thus, the temperature of a descending air parcel increases approximately 3 °C per 1,000 feet (9.8 °C per kilometer). Concurrently, the dewpoint increases approximately 0.5 °C per 1,000 feet (1.8 °C per kilometer). The parcel’s temperature-dewpoint spread increases, while its relative humidity decreases.
The parcel and the surrounding environmental air temperatures are then compared. If the lifted parcel is colder than the surrounding air, it will be denser (heavier) and sink back to its original level. In this case, the parcel is stable because it resists upward displacement. If the lifted parcel is the same temperature as the surrounding air, it will be the same density and remain at the same level. In this case, the parcel is neutrally stable. If the lifted parcel is warmer and, therefore, less dense (lighter) than the surrounding air, it will continue to rise on its own until it reaches the same temperature as its environment. This final case is an example of an unstable parcel. Greater temperature differences result in greater rates of vertical motion.