AT75, vicinity Nelson New Zealand, 2017

AT75, vicinity Nelson New Zealand, 2017

Summary

On 9 April 2017, an ATR 72-500 crew were unable to obtain a right main landing gear locked down indication during their approach to Nelson and diverted to Palmerston North where the gear did not collapse on landing. The Investigation found the indication had been consequent on failure of both right main gear locking springs due to corrosion and that existing preventative maintenance procedures would not have detected this. It was also noted that contrary to the applicable procedures, the crew had cycled the gear several times which might, but in the event did not, have had significant effects.

Description

On 9 April 2017, an ATR 72-500 (ZK-MCY) being operated by Mount Cook Airline on a scheduled domestic passenger flight from Auckland to Nelson was unable to obtain a right main landing gear locked-down status indication on approach to Nelson in day VMC and after declaring a ‘PAN’ diverted to the longer runway at Palmerston North where despite the same unsafe indication for the right gear, it did not collapse and the aircraft was stopped on the runway for disembarkation.

Investigation

An Investigation into the accident was carried out by the Transport Accident Investigation Commission (TAIC). The CVR was removed from the aircraft and the QAR was downloaded. When the CVR data were subsequently downloaded, it was found that although the crew had tripped the corresponding CB before leaving the aircraft, the first few minutes of relevant data had been overwritten because this CB had been reset when the aircraft was later removed from the runway.

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