SDR MTNA202008172101

Service difficulty report · O-Ring · Aerosp ATR42300

Difficulty date: July 14, 2020
Submitted: August 17, 2020
Operation: Air carrier
Aircraft: N918FX
Make and model: Aerosp ATR42300
Aircraft serial: 262
Aircraft time: 29,146 hours, 37,391 cycles
Propeller: Hamstd 14SF5
System (JASC): 6120 · Propeller Controlling System
Part: O-Ring
Part number: MS28775
Condition: Leaking
Location: Prop Control
Component: Prop Control · Hamstd
Component part number: 78249051
Stage of operation: CR
How discovered: O
Nature of condition: J
Precautionary procedure: E, A

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

What was found

DURING CRUIS, RIGHT UNCOMMANDED TORQUE INDICATED 120%, ACCOMPANIED BY AIRPLANE ASYMMETRY. REPLACED #2 PROPELLER CONTROL UNIT O-RINGS, OPERATIONALLY CHECKS GOOD. UPON FOQA DOWNLOAD FOUND OVERTORQUE TO HAVE BEEN 146%. REPLACED RH PROPELLER ASSEMBLY FOR INSPECTION, PERFORMED ENGINE REDUCTION GEAR BOX CHIP DETECTOR AND OIL FILTER CHECKS, NO DISCREPANCIES WERE DISCOVERED.

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