Boeing 747-240 APBAK

Summary

On 7 December 1995 at about 02:50 local time, a Boeing 747-240 registered APBAK, operated by Pakistan International Airline, was involved in an incident near Jamaica, New York, United States. 255 people were on board and nobody was injured. The aircraft was slightly damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

7 December 1995 at 02:50

Classification

Incident

Location

Jamaica, New York, United States

Nearest airport

John F Kennedy Intl (JFK)

Coordinates

Not recorded

Aircraft

Boeing 747-240

Registration

APBAK

Category

Airplane

Engines

4

Operator

Pakistan International Airline

Operating rule

Part 129: Foreign

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

Unknown → Paris, France

Aircraft damage

Minor

Weather

VMC

Light

Night/Dark

NTSB number

NYC96IA036

Nobody was injured.

failure of the number two engine fan mid shaft, due a fatigue fracture caused by a previous bearing failure, and failure of the operator's maintenance personnel to detect the cracks during subsequent inspections.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

After takeoff, about 1,000 ft agl, the crew of the Boeing 747-240 heard a 'thudding noise,' followed by a loss of power in the number two engine. An engine shut down was completed, and an uneventful landing was made at the departure airport. The airplane was equipped with General Electric CF6-50E2 engines. Examination revealed that the low pressure turbine module, which included a portion of the fan mid shaft (FMS) and turbine rear frame, was missing. The airplane sustained damage to the left wing leading and tailing edge flaps, the left main wing landing gear doors, and the number one engine. Examination of the number two engine revealed a fracture face on the forward end of the FMS that showed multiple fatigue origins and circumferential cracks. There were also areas on the FMS that were heat affected. The FMS had previously been installed in a CF6-50 engine that had sustained a failure of the number 3 bearing inner race. The engine had been inspected by company personnel, and records did not reflect that they inspected the FMS for heat affected material. Fatigue cracks located in the heat-affected areas were found to have Sermetel paint and debris in the cracks.

Quoted verbatim from the NTSB record.