

Détails:
The flight from Taipei to about 300 nmi northwest of San Francisco was uneventful and the airplane was flying at about 41,000 feet mean sea level when the No. 4 engine lost power. During the attempt to recover and restore normal power on the No. 4 engine, the airplane rolled to the right, nosed over, and entered an uncontrollable descent. The captain was unable to restore the airplane to stable flight until it had descended to 9,500 feet. After the captain stabilized the airplane, he elected to divert to San Francisco International Airport, where a safe landing was made. Although the airplane suffered major structural damage during the upset, descent, and subsequent recovery, only two persons among the 274 passengers and crew on board were injured seriously.
The maximum vertical acceleration forces recorded during the descent were 4.8Gs and 5.1Gs as the airplane descended through 30,552 feet and 19,083 feet, respectively.
PROBABLE CAUSE: "The captainÂ’s preoccupation with an inflight malfunction and his failure to monitor properly the airplaneÂ’s flight instruments which resulted in his losing control of the airplane. Contributing to the accident was the captainÂ’s over-reliance on the autopilot after the loss of thrust on the no. 4 engine."
accident date: 19-02-1985
type: Boeing 747SP-09
registration: N4522V
| Statuts: | Accident investigation report completed and information captured |
| Date: | mardi 19 février 1985 |
| Heure: | 10:16 PST |
| Type/Sous-type: |  Boeing 747SP-09 |
| Compagnie: | China Airlines |
| Immatriculation: | N4522V |
| Numéro de série: | 22805/564 |
| Année de Fabrication: | 1982-06-10 (2 years 9 months) |
| Heures de vol: | 10192 |
| Moteurs: | 4 Pratt & Whitney JT9D-7A |
| Equipage: | victimes: 0 / Ã bord: 23 |
| Passagers: | victimes: 0 / Ã bord: 251 |
| Total: | victimes: 0 / Ã bord: 274 |
| Dégats de l'appareil: | Substantiels |
| Conséquences: | Repaired |
| Lieu de l'accident: | 550 km (343.8 milles) NW de San Fransisco, CA, USA ( Océan Pacifique)
|
| Phase de vol: | En vol (ENR) |
| Nature: | Transport de Passagers Intern. |
| Aéroport de départ: | Taipei-Chiang Kai Shek International Airport (TPE/RCTP), Taïwan |
| Los Angeles International Airport, CA (LAX/KLAX), Etats-Unis d'Amérique | |
| Numéro de vol: | 006 |
The flight from Taipei to about 300 nmi northwest of San Francisco was uneventful and the airplane was flying at about 41,000 feet mean sea level when the No. 4 engine lost power. During the attempt to recover and restore normal power on the No. 4 engine, the airplane rolled to the right, nosed over, and entered an uncontrollable descent. The captain was unable to restore the airplane to stable flight until it had descended to 9,500 feet. After the captain stabilized the airplane, he elected to divert to San Francisco International Airport, where a safe landing was made. Although the airplane suffered major structural damage during the upset, descent, and subsequent recovery, only two persons among the 274 passengers and crew on board were injured seriously.
The maximum vertical acceleration forces recorded during the descent were 4.8Gs and 5.1Gs as the airplane descended through 30,552 feet and 19,083 feet, respectively.
Probable Cause:
PROBABLE CAUSE: "The captainÂ’s preoccupation with an inflight malfunction and his failure to monitor properly the airplaneÂ’s flight instruments which resulted in his losing control of the airplane. Contributing to the accident was the captainÂ’s over-reliance on the autopilot after the loss of thrust on the no. 4 engine."
Accident investigation:
 |
|
Sources:
» NTSB/AAR-86/03Photos
accident date: 19-02-1985
type: Boeing 747SP-09
registration: N4522V
Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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