Service difficulty report · Gearbox · Bell 407

Difficulty date
November 8, 2022
Submitted
November 9, 2022
Operation
Air carrier
Aircraft
N434AM
Make and model
Bell 407
Aircraft serial
54407
Aircraft time
4,442 hours
Engine
Allsn 250C47B
Engine time
7,052 hours
Part
Gearbox
Condition
Making Metal
Location
Main Rotor
Stage of operation
LD
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

WHILE IN THE DECELERATION PHASE FOR LANDING, THE "XMSN CHIP" AND MASTER CAUTION LIGHTS ILLUMINATED. ALL OTHER INDICATIONS - TRANSMISSION PRESSURE, TEMP. WERE NORMAL. NO ABNORMAL NOISE OR VIBRATIONS NOTED. LANDING AND SHUTDOWN WERE NORMAL. INSPECTED CHIP DETECTORS, SMALL SILVER FLAKES LESS THAN 1 MM FOUND ON MGB SUMP. WHICH IS NORMAL FOR A TRANS WITH LESS THAN 100FH AS PER THE BELL MANUAL. CURRENT TRANSMISSION TIME SINCE OVERHAUL / INSTALLATION IS 78+23FH. RETAINED FLAKES FOR HISTORICAL USE. DRAINED AND RESERVICED, FILTER CHANGE, AND PERFORMED GROUND RUN.

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