United States of America

After landing at Fort Campbell AFB, the crew encountered technical problems and the aircraft was unable to stop within the remaining distance. It overran and came to rest few dozen yards further. Two crew members were seriously injured while three others were killed.

The crew attempted an ILS approach with indefinite ceiling and RVR down to zero due to fog. The copilot was at controls. During a missed approach, the aircraft contacted runway where glideslope intersects terrain with sufficient force to shear all three landing gear. The right engine spolled down during climbout. The crew diverted to Detroit-Metropolitan Airport and complete a gear up landing. Minor fire broke out during ground slide. Both altimeters bench checked within tolerances. All three crew escaped with minor injuries.

AeroMéxico flight AM498 was a scheduled passenger flight from Mexico City to Los Angeles with intermediate stops at Guadalajara, Loreto and Tijuana. The DC-9, named 'Hermosillo', departed Tijuana Airport at 11:20 and proceeded toward Los Angeles at FL100. At 11:44 Coast Approach Control cleared the flight to 7,000 feet. Just three minutes earlier Piper PA-28-181 Cherokee N4891F departed Torrance Airport, CA for a VFR flight to Big Bear, CA. On board were a pilot and two passengers. The Piper pilot turned to an easterly heading toward the Paradise VORTAC and entered the Terminal Control Area (TCA) without receiving clearance from ATC as required by FAR Part 91.90. At 11:47 the AeroMéxico pilot contacted LA Approach Control and reported level at 7,000 feet. The approach controller cleared flight 498 to depart Seal Beach on a heading of 320 degrees for the ILS runway "two five left final approach course...". At 11:51:04, the approach controller asked the flight to reduce its airspeed to 190 KIAS and cleared it to descend to 6,000 feet. At about 11:52:09, flight 498 and the Piper collided over Cerritos at an altitude of about 6,560 feet. The Piper struck the left hand side of the DC-9's horizontal and vertical stabilizer. The horizontal stabilizer sliced through the Piper's cabin following which it separated from the tailplane. Both planes tumbled down out of control. The wreckage and post impact fires destroyed five houses and damaged seven others. Fifteen persons on the ground were killed. The sky was clear, the reported visibility was 14 miles.

On 5/1/86, the pilot had an acoustic tumor removed from his right ear which included the removal of the 8th nerve (balance nerve). His attending physician suggested approximately 1 year period of recuperation due to equilibrium problems associated with this type of surgery. On 7/12/86, he had a 1st class medical exam and received a medical certificate which was valid for flight test only. On 8/28/86, while taking off at night, the aircraft collided with rising terrain approximately 1.5 mile from the end of the runway at an elevation of about 5,600 feet. The airport elevation was 5,586 feet. A witness stated that he saw the aircraft takeoff, but it did not climb after takeoff. An investigation revealed that the accident occurred in an area that was isolated from ground lights. A post crash examination revealed no evidence of a mechanical failure or malfunction of the aircraft structure, flight controls, engine or propellers. According to the pilot's log book, his last night flight was on 3/22/85. He had been on duty for approximately 14 hours when the accident occurred. All seven occupants were killed.

While approaching for a landing, the aircraft pitched up, rolled inverted and impacted the terrain to the left of the runway. No preimpact part failure/malfunction was found; however, an investigation revealed the aircraft had been loaded with the center-of-gravity (cg) well behind the aft limit. The aircraft had been weighed on 9/8/84. Later, on 1/2/86, weight and balance data had been recomputed after removal of a radar and an autopilot, but an error had been made during the weight and balance preparation. Subsequently, the aircraft was operated in a tail heavy condition. Whether using the existing or the correct data, calculations for this flight should have shown the cg was behind the aft limit. The elevator trim tab was found trimmed to a full nose down position; 200 lbs of ballast had been installed in the vicinity of the aft cargo door. Tests of lung tissue showed the pilot and copilot had alcohol levels of 0,44‰ and 1,71‰, respectively. The pilot's urine tested 0,35‰ for alcohol. Also, phenyltoloxamine, acetaminophen and chlorpheniramine (medications commonly used in decongestants/antihistamines) were detected in his urine. Both occupants were killed.

While en route, the pilot was cleared to deviate 20° left of course to avoid thunderstorm activity that ARTCC radar showed was right of course. The pilot reported turbulences, but demurred descending to a lower altitude despite a pirep of clear weather below. He then reported 'in a cell' with turbulences. Radar and radio contact with the aircraft were lost. Another pilot, who flew approximately 15 miles further south, reported no weather, but said there was extreme weather to the north with near constant lightning. Subsequently, N340MV impacted the ground in a steep nose-down, left wing low attitude, after a 14,000 feet descent. The landing gear was extended when the plane crashed. An exam of the wreckage revealed no preimpact structural failure or aircraft component malfunction. Also, the wreckage showed no evidence of weather damage from hail or lightning. However, weather info showed there was high altitude thunderstorm activity with turbulences in the area at the time of the mishap. Both occupants were killed.

Although low altitude flight within the gorge was not in accordance with the mission profile the pilot entered the canyon and proceeded upslope towards rising terrain. 87% of the pilot's extensive flight experience was in helicopter aircraft and he had acquired an estimated total of only 13 hours in make/model at the time of the accident. The aircraft was slightly over its gross weight at the time of the accident and high density altitude conditions existed. During the pilot's attempt to reverse direction at the end of the gorge the aircraft stalled and a loss of control followed. A stall/spin maneuver resulted placing the aircraft in an uncontrolled descent into the terrain. All six occupants were killed.

At 2232 edt, the aircraft was climbing to 15,000 feet when the pilot reported a low oil pressure light. ATC advised Jimmy Stewart Field is about eleven thirty and 15 miles. After the pilot asked, 'is that a Tower Field?', ATC advised he did not know, Westmoreland County is at two o'clock and about 15 miles, turn right 180°, descend and maintain 4,000 feet. At 2233 edt, ATC said that they believe Westmoreland County Tower is closed down. The pilot said that he was thinking of where he should go and ATC advised Pittsburgh's 35 miles away if you can make that. At 2234:35 edt, the aircraft was returning to Pittsburgh when the pilot reported zero oil pressure and an oil light. At 2237:27 edt, the pilot reported an emergency. Flight was cleared to Allegheny County Airport and advised Monroeville Airport 230 heading and 5 miles. The aircraft crashed at 2247 edt. The investigation showed a loose flange nut on left turbocharger feed line finger tight. Test produced a steady leak. At site oil covered bottom of fuselage and empennage. Two passengers were killed while two other occupants were injured.

The pilot was on a VFR flight from Montpelier, VT to Burlington, VT; a distance of about 80 miles. A mountain range is between the two location. Shortly after takeoff the pilot radioed Burlington approach control and requested an IFR clearance to land at Burlington. He reported that he was 10 miles northwest of Montpelier. The pilot was assigned a transponder code. The air traffic controller then noticed that the aircraft was near a mountain at a unverified altitude of 3,500 feet. The controller alerted the pilot that he was 2 miles south of a 4,393 feet high mountain. There was no response from the pilot. The aircraft collided with the east side of Mt Ethan Allen at a height of 3,580 feet. The aircraft was on a northwest heading at impact. VFR conditions of 3,800 feet broken and 4,000 feet scattered existed at the time. The pilot, sole on board, was killed.

The Lear 55 taxied out for takeoff and inadvertently attempted a takeoff on the wrong runway. When he realized his mistake, he aborted the takeoff because he knew the runway length was significantly less than his required field length. Insufficient runway also remained for the aborted takeoff and the aircraft ran off the end of the runway and hit a stone wall. The aircraft was destroyed by fire and the copilot received minor injuries while the pilot and the passenger were not injured.