ORAC
4th Jun 2002, 13:49
AWST 27th May:
JAL Captain Indicted
In Fatal Pitchup
EIICHIRO SEKIGAWA/TOKYO and
MICHAEL MECHAM/SAN FRANCISCO
The captain of a Japan Airlines MD-11 that experienced severe air turbulence leading to the death of a cabin attendant has been indicted on a charge of "professional negligence resulting in death."
Capt. Koichi Takamoto, 52, was indicted by the Nagoya District Prosecutor's Office on May 14 for making manual flight control inputs while the autopilot system was engaged. The incident occurred on June 8, 1997, as JAL Flight 706, was on a too-fast approach to Nagoya International Airport on a flight out of Hong Kong.
The indictment said he was flying the aircraft on autopilot as it descended at 4,500 ft./min. at 350 kt. The aircraft's airspeed increased to 368 kt., exceeding its maximum operating speed (Vmo) of 365 kt. The captain, intending to decelerate by pulling up the nose, tried overriding the autopilot system by pulling back on the yoke and deploying the speed brake.
The autopilot was disengaged but a moment later the aircraft began 15 sec. of violent bucking at an altitude of 16,700 ft. In all, the MD-11's nose pitched up and down five times. Its pitch angle changed from *3 deg. to +10 deg. and vertical acceleration changed from 2.8g to *0.5g. Four passengers and seven crewmembers were injured. A 34-year-old flight attendant, Atsuko Taniguchi, was walking the aisle to check seat belts. She was thrown against the ceiling, hit her head, entered a coma and later died.
When the pitching was brought under control, the aircraft landed 26 min. later without incident.
The indictment faulted Takamoto for attempting to manually override the autopilot before disengaging it. Had he disengaged it first and then pulled on the yoke to achieve a nose up, the aircraft would not have reacted so violently, prosecutors said, making him responsible for the death and injuries.
The prosecutor's action contradicts a report from Japan's Aircraft Accident Investigation Committee (AAIC) of the Ministry of Transport. It faulted Takamoto's actions with regard to the autopilot and speed brake, but is considered sympathetic to the captain because it focused on the longitudinal stability of the aircraft.
The indictment drew the ire of the Japan Pilot Assn., Japan Airlines and the Air Line Pilots Assn. Referring to Annex 13, which governs accident investigations under the Convention on International Civil Aviation, ALPA says investigators cannot expect full disclosure by everyone involved in an investigation if the threat of prosecution is present.
"Pilots have agreed to be honest in describing what actions they took, right or wrong," ALPA First Vice President Dennis Dolan said. "But when you lay the threat of criminal prosecution on, it's going to have a chilling effect."
In their report, the Transport Ministry's accident investigators said:
The smaller tailplane of the MD-11, when compared to the DC-10, decreases its longitudinal stability in high-altitude flight. Because longitudinal control at high altitude requires less power than at low altitude, it sometimes induces overcontrol in an MD-11.
In its own comment on the incident, the U.S. NTSB said pitch upsets in the MD-11 may be more severe than in other aircraft because control column forces needed for manual control in cruise flight can be much lighter than on other aircraft models. They are "considerably lighter than those normally used at lower speeds and altitudes," it said.
McDonnell Douglas' MD-11 Flight Crew Operating Manual said overpowering the autopilot with control forces can cause the autopilot to disengage with too much control input, which could result in over-control during recovery. But it does not mention severe pitchups.
The manual prohibits overriding the autopilot in severe turbulence. It warns pilots to drop power to minimum when flying under manual control in turbulence, but states nothing about overriding the autopilot and control power in calm air.
The pilot should have reduced power or let go of the column in a violent pitchup, but the MD-11 manual doesn't mention this. It also says nothing about recovery from an unusual attitude or what to do when the aircraft exceeds Vmo.
JAL's MD-11 simulator program does not include training for overriding or automatic disengagement of the autopilot.
The AAIC recommended that the FAA require Boeing (which bought out McDonnell Douglas) improve the MD-11 autopilot and review its flight simulation training program.
The flight control computer was later changed, as part of an effort to give a common type rating between the MD-11 and the FedEx "MD-11" DC-10 conversion program, according to a Boeing official.
The Nagoya action is the first prosecution of a Japanese pilot since 1971 when an air force captain was convicted of providing insufficient supervision of a wingman who collided with an All Nippon Airways 727 that killed all on board. The wingman bailed out and was acquitted; the pilot received three years in prison.
JAL Captain Indicted
In Fatal Pitchup
EIICHIRO SEKIGAWA/TOKYO and
MICHAEL MECHAM/SAN FRANCISCO
The captain of a Japan Airlines MD-11 that experienced severe air turbulence leading to the death of a cabin attendant has been indicted on a charge of "professional negligence resulting in death."
Capt. Koichi Takamoto, 52, was indicted by the Nagoya District Prosecutor's Office on May 14 for making manual flight control inputs while the autopilot system was engaged. The incident occurred on June 8, 1997, as JAL Flight 706, was on a too-fast approach to Nagoya International Airport on a flight out of Hong Kong.
The indictment said he was flying the aircraft on autopilot as it descended at 4,500 ft./min. at 350 kt. The aircraft's airspeed increased to 368 kt., exceeding its maximum operating speed (Vmo) of 365 kt. The captain, intending to decelerate by pulling up the nose, tried overriding the autopilot system by pulling back on the yoke and deploying the speed brake.
The autopilot was disengaged but a moment later the aircraft began 15 sec. of violent bucking at an altitude of 16,700 ft. In all, the MD-11's nose pitched up and down five times. Its pitch angle changed from *3 deg. to +10 deg. and vertical acceleration changed from 2.8g to *0.5g. Four passengers and seven crewmembers were injured. A 34-year-old flight attendant, Atsuko Taniguchi, was walking the aisle to check seat belts. She was thrown against the ceiling, hit her head, entered a coma and later died.
When the pitching was brought under control, the aircraft landed 26 min. later without incident.
The indictment faulted Takamoto for attempting to manually override the autopilot before disengaging it. Had he disengaged it first and then pulled on the yoke to achieve a nose up, the aircraft would not have reacted so violently, prosecutors said, making him responsible for the death and injuries.
The prosecutor's action contradicts a report from Japan's Aircraft Accident Investigation Committee (AAIC) of the Ministry of Transport. It faulted Takamoto's actions with regard to the autopilot and speed brake, but is considered sympathetic to the captain because it focused on the longitudinal stability of the aircraft.
The indictment drew the ire of the Japan Pilot Assn., Japan Airlines and the Air Line Pilots Assn. Referring to Annex 13, which governs accident investigations under the Convention on International Civil Aviation, ALPA says investigators cannot expect full disclosure by everyone involved in an investigation if the threat of prosecution is present.
"Pilots have agreed to be honest in describing what actions they took, right or wrong," ALPA First Vice President Dennis Dolan said. "But when you lay the threat of criminal prosecution on, it's going to have a chilling effect."
In their report, the Transport Ministry's accident investigators said:
The smaller tailplane of the MD-11, when compared to the DC-10, decreases its longitudinal stability in high-altitude flight. Because longitudinal control at high altitude requires less power than at low altitude, it sometimes induces overcontrol in an MD-11.
In its own comment on the incident, the U.S. NTSB said pitch upsets in the MD-11 may be more severe than in other aircraft because control column forces needed for manual control in cruise flight can be much lighter than on other aircraft models. They are "considerably lighter than those normally used at lower speeds and altitudes," it said.
McDonnell Douglas' MD-11 Flight Crew Operating Manual said overpowering the autopilot with control forces can cause the autopilot to disengage with too much control input, which could result in over-control during recovery. But it does not mention severe pitchups.
The manual prohibits overriding the autopilot in severe turbulence. It warns pilots to drop power to minimum when flying under manual control in turbulence, but states nothing about overriding the autopilot and control power in calm air.
The pilot should have reduced power or let go of the column in a violent pitchup, but the MD-11 manual doesn't mention this. It also says nothing about recovery from an unusual attitude or what to do when the aircraft exceeds Vmo.
JAL's MD-11 simulator program does not include training for overriding or automatic disengagement of the autopilot.
The AAIC recommended that the FAA require Boeing (which bought out McDonnell Douglas) improve the MD-11 autopilot and review its flight simulation training program.
The flight control computer was later changed, as part of an effort to give a common type rating between the MD-11 and the FedEx "MD-11" DC-10 conversion program, according to a Boeing official.
The Nagoya action is the first prosecution of a Japanese pilot since 1971 when an air force captain was convicted of providing insufficient supervision of a wingman who collided with an All Nippon Airways 727 that killed all on board. The wingman bailed out and was acquitted; the pilot received three years in prison.