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Last updated: 12 June 2021
Status:Schlussbericht
Datum:Dienstag 19 Februar 1985
Zeit:10:16 PST
Flugzeugtyp:Silhouette image of generic B74S model; specific model in this crash may look slightly different
Boeing 747SP-09
Fluggesellschaft:China Airlines
Kennzeichen: N4522V
Werknummer: 22805/564
Baujahr: 1982-06-10 (2 years 9 months)
Betriebsstunden:10192
Triebwerk: 4 Pratt & Whitney JT9D-7A
Besatzung:Todesopfer: 0 / Insassen: 23
Fluggäste:Todesopfer: 0 / Insassen: 251
Gesamt:Todesopfer: 0 / Insassen: 274
Sachschaden: schwer beschädigt
Konsequenzen: Repaired
Unfallort:550 km (343.8 Meilen) NW vom Land entfernt von San Fransisco, CA, USA (   Pacific Ocean)
Flugphase: Während des Fluges (ENR)
Betriebsart:Internationaler Linienflug
Flug von:Taipei-Chiang Kai Shek International Airport (TPE/RCTP), Taiwan
Flug nach:Los Angeles International Airport, CA (LAX/KLAX), USA
Flugnummer: 006
Unfallbericht:
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 captain’s preoccupation with an inflight malfunction and his failure to monitor properly the airplane’s flight instruments which resulted in his losing control of the airplane. Contributing to the accident was the captain’s over-reliance on the autopilot after the loss of thrust on the no. 4 engine."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 1 months
Accident number: NTSB/AAR-86/03
Download report: Final report

Informationsquelle:
» NTSB/AAR-86/03


Fotos

photo of Boeing-747SP-09-N4522V
accident date: 19-02-1985
type: Boeing 747SP-09
registration: N4522V
photo of Boeing-747SP-09-N4522V
 
This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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