Service difficulty report · Transmission · Bell 407

Difficulty date
November 8, 2017
Submitted
November 8, 2017
Operation
Air carrier
Aircraft
N408GA
Make and model
Bell 407
Aircraft serial
53392
Aircraft time
12,511 hours, 28,307 cycles
Part
Transmission
Part number
407040006115FM
Part serial
A599
Condition
Making Metal
Location
Main Rotor
Part time
6,916 hours
Stage of operation
CR
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

PILOT HAD A TRANSMISSION CHIP LIGHT DURING CRUISE AND LANDED. MAINTENANCE INVESTIGATED THE CHIP DETECTOR AND FOUND 3 TYPES OF PARTICLES. IAW MM 63-00-00, PAGE 29 THE FIRST TYPE OF PARTICLES WERE TINY WHISKER LIKE PARTICLES INSIGNIFICANT, THE SECOND WERE THE IRREGULAR SHAPED FERROUS METAL PARTICLES ONE ALSO INSIGNIFICANT. THE THIRD TYPE WERE THE NEARLY FLAT PIECES, THREE FLAKES , WHICH IS SIGNIFICANT DEBRIS IAW MM. THE MAINTENANCE INSTRUCTIONS FOR THE THIRD TYPE OF DEBRIS IS TO REPAIR OR REPLACE THE COMPONENT.

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