Wrong
data inputs caused Jet 777 late take-off at London Heathrow
Jet Airways has amended its standard operating procedures for take-off
following a late take-off incident that occurred on 30 August 2016, involving
one of its Boeing 777-300ERs at London Heathrow airport.
The aircraft, registered VT-JEK, was departing from on a flight to Mumbai at
20:30UTC, when it crossed the airfield boundary at 13ft above ground level and
an adjacent road at 30ft above ground level. There were no reports of injuries
among the 15 crew and 231 passengers on board.
The UK Air Accidents Investigation Branch classified the case as a serious
incident, and delegated the investigation to India's Air Accident Investigation
Bureau.
In its final report, the Indian AAIB found that VT-JEK took off from runway
intersection S4 on runway 27L, but the used performance figures calculated for
intersection N1, which was the full length of the runway. Consequently,
regulatory take-off performance requirements were compromised.
The pilot-in-command calculated the aircraft take-off performance from the
first four intersections of the runway using the default On-Board Performance
Tool (OPT) output corresponding to the full length, whereas the co-pilot had
correctly calculated performance for a takeoff from intersection S4W.
The discrepancy was identified during the post-calculation crosscheck of the
OPT output. However, the co-pilot changed her OPT entry to match the
pilot-in-charge "probably due to the fact that commander was much senior
to the co-pilot".
Rotation was initiated with 556m of runway remaining and lift-off occurred with
97m remaining. As the aircraft passed the end of the runway, the three radio
altimeters recorded heights above the surface of 16.4ft, 16.6ft and 17ft
respectively.
"From a procedural perspective, there appeared to be no assurance that an
incorrect or invalid entry into the OPT made at the departure briefing would be
corrected before the performance calculation was made," says the AAIB.
The AAIB adds that a contributory factor to the incident include both pilots
flying out of the runway for the first time.
Jet now requires its crew to call out and resolve discrepancies between the
output of the pilot-in-command and co-pilots OPT before entering data into the
control and display unit.
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