A Nigeria investigator revealed that 85 % of the Alliance Air Boeing 737-400 cargo ships landed in the “flap 15” setting six weeks before the excursion of the Gear Collapse in Abuja and the runway excursion. did.
A survey on an accident on December 11 recommends that the fleet inspects the problem of landing gear and flaps.
Allied Air's Aircraft (5N-JRT) operated a positioning flight from Lagos to pick up the Nigerian Central Bank cargo. At that time, no cargo was on board.
However, when the crew selected “Flap 30” during the approach to the Avaja runway 22, the flap did not extend beyond the “flap 15” position.
The crew chose to continue the approach because the weight of the aircraft was within the limit. At this point, the jet was about 0.6 nm from the runway and was cleared up to land.
Flight-data recorder information indicates that the jet has landed at 157kt.
According to the Nigeria Safety Investigation Bureau, the crew testified that touchdown was smooth.
Shortly thereafter, they said they had “collapsed” to the right as the mainlanding gear on the right was separated, and the aircraft had “collapsed”.
The engine on the right was in contact with the runway and cut the surface nearly 1,200m before the aircraft changed to the right.
I started resting at the top of the 54m grass from the end of the runway.
All six residents evacuated the aircraft from the front exit without injury.
The Safety Research Bureau stated that the aircraft test did not reveal evidence of hardware landing.
However, analysis of flight data records showed that 85 of the 101 landing landed in the “flap 15” setting for six weeks from the day of the accident from November 1.
The other 16 landing used “Flap 25”.
The Safety Bureau has not yet reached a final conclusion on occurrence, but recommended for Allyed AIR to inspect all aircraft for “potential mechanical and structural vulnerability” including flaps and landing gear systems. It is issued.
Further analysis is performed on aircraft involved in accidents, including detailed inspections of the main gear semi -brew and flap -driven system component on the right.
