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Printed page 1. PDF page 9.
flight at flight level 310 (31,000 feet) for approximately seven minutes when the last secondary radar return was received just before 19.03 hrs. The radar then showed multiple primary returns fanning out downwind. Major portions of the wreckage of theOpen official document at PDF page 9AAIB Aircraft Accident Report 2/90: Boeing 747-121 N739PA, Lockerbie
Printed page 3. PDF page 11.
transmitted the aircraft's oceanic clearance but this transmission was not acknowledged. The secondary radar return from Flight PA103 disappeared from the radar screen during this transmission. Multiple primary radar returns were then seen fanning out downwind for a considerablOpen official document at PDF page 11AAIB Aircraft Accident Report 2/90: Boeing 747-121 N739PA, Lockerbie
Printed page label not indexed. PDF page 41.
screen from which it was clear that the flight had progressed in a normal manner until secondary surveillance radar (SSR) was lost. 33Open official document at PDF page 41AAIB Aircraft Accident Report 2/90: Boeing 747-121 N739PA, Lockerbie
Printed page label not indexed. PDF page 42.
so that an accurate time and position for the aircraft could be determined. The last secondary return from the aircraft was recorded at 19.02:46.9 hrs, identifying N739PA at Flight Level 310, and at the next radar return there is noOpen official document at PDF page 42AAIB Aircraft Accident Report 2/90: Boeing 747-121 N739PA, Lockerbie