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Printed page 13. PDF page 21.
clearance when the CVR stopped. By synchronising the Shanwick tape and the CVR it was possible to establish that a loud sound was heard on the CVR cockpit area microphone (CAM) channel at 19.02:50 hrs +1 second. As the ShanwickOpen official document at PDF page 21AAIB Aircraft Accident Report 2/90: Boeing 747-121 N739PA, Lockerbie
Printed page label not indexed. PDF page 37.
number of loose items originating from within the cabin or baggage hold. It was not possible initially to determine whether any of the general damage to any of the engine fans or the ingestion noted in No 3 engine intakeOpen official document at PDF page 37AAIB Aircraft Accident Report 2/90: Boeing 747-121 N739PA, Lockerbie
Printed page label not indexed. PDF page 44.
discusses the technical aspects of the disintegration of the aircraft and considers possible ways of mitigating the effects of an explosion in the future. Explosive destruction of the aircraft The geographical position of the final secondary return at 19.02:46.9 hrsOpen official document at PDF page 44AAIB Aircraft Accident Report 2/90: Boeing 747-121 N739PA, Lockerbie
Printed page 37. PDF page 45.
Only 17 bits of data were not recoverable (less that 23 milliseconds) and it was not possible to establish with any certainty if this data was from the accident flight or was old data from a previous recording. The analysisOpen official document at PDF page 45AAIB Aircraft Accident Report 2/90: Boeing 747-121 N739PA, Lockerbie
Printed page label not indexed. PDF page 46.
2.3.2 2.3.3 possible to reduce some of the delays external to the recorder, it is possible to reduce any data loss due to buffering of data within the data acquisition unit. It is, therefore, recomOpen official document at PDF page 46AAIB Aircraft Accident Report 2/90: Boeing 747-121 N739PA, Lockerbie
Printed page 42. PDF page 50.
have experienced a large angle of sideslip. The loss of the fin would have made this possible and also subjected the structure to large side loads. It is possible that such side loading would have assisted the disintegration of theOpen official document at PDF page 50AAIB Aircraft Accident Report 2/90: Boeing 747-121 N739PA, Lockerbie