B747 AirACT runway excursion HKG


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Pubblicato il Preliminary Report

Alcuni punti salienti:
  • The aircraft was dispatched with Minimum Equipment List (MEL) items which included:
  • Number 4 engine thrust reverser inoperative.
  • After touchdown the Speed Brake Lever extended with the appropriate crew call.
  • Reverse thrust of approximately 95% N1 was selected on Number 2 and Number 3 engines with Number 1 engine selected to idle reverse with a crew call 'Reversers Normal'.
  • The Autobrake disarmed and a crew call 'Manual Braking' was made.
  • The captain took control of the aircraft.
  • Subsequently, the following data is observed from the Flight Data Recorder:
  • Number 4 engine accelerated to 90% N1 forward thrust at 03:52:30 hours.
  • All selected thrust reversers were stowed at 03:52:35 hours.
  • Number 4 engine continued to accelerate to approximately 106% N1 forward thrust at 03:52:36 hours and ended up at 107% N1 at 03:52:42 hours.
  • Reverse thrust of approximately 92% N1 was again selected on Number 2 engine at 03:52:41 hours. Number 1 and Number 3 engine thrust reversers were also deployed reaching reverse thrust of approximately 83% N1 and 91% N1 respectively. Those thrust reverser selections occurred after the aircraft had veered off the runway.
 

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