Service difficulty report · Gearbox · Aerosp ATR42320

Difficulty date
February 18, 2015
Submitted
August 5, 2015
Operation
General aviation
Make and model
Aerosp ATR42320
Aircraft time
46,200 hours
Engine
Pwa PW121
Propeller
Hamstd 14SF5
Part
Gearbox
Condition
Failed
Location
Accessory
Stage of operation
CR
How discovered
O
Nature of condition
F
Precautionary procedure
E, A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) THE CREW EXPERIENCED A LOW OIL PRESSURE IN FLIGHT ON THE NR 2 ENGINE. THE CREW SHUT THE ENGINE DOWN. THE ACFT LANDED UNEVENTFULLY. AFTER LANDING, THE TEAM ON SITE DETERMINED THE CAUSE TO BE OIL LEAKING FROM THE SEAL BETWEEN THE GEARBOX AND THE OVERSPEED GOVERNOR HYDRAULIC PUMP. THE SEAL BETWEEN THE GEARBOX AND OVERSPEED GOVERNOR HYDRAULIC PUMP TO BE REPLACED. FURTHER INVESTIGATION HAS DETERMINED THAT THERE HAS BEEN A PREVIOUS BLEND OUT ON THE RGB GOVERNOR PAD AND THAT IT IS IN THIS AREA THAT THE GASKET LEAKED. A MRT WILL REPLACE THE RGB COVER.

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