Service difficulty report · Bearing · Bell 407

Difficulty date
February 6, 2019
Submitted
February 11, 2019
Operation
Air carrier
Aircraft
N459AM
Make and model
Bell 407
Aircraft serial
54392
Aircraft time
2,287 hours
Part
Bearing
Condition
Damaged
Location
M/R Gearbox
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

PILOT STATES HE WAS CRUISING AT 78-80% TQ @ 2000FT. TRANSMISSION WAS IN THE GREEN. CHIP INDICATOR CAME ON AND IMMEDIATELY WENT OUT. THEN 30 SECONDS LATER IT CAME ON AGAIN AND STAYED ON. PILOT THEN DIVERTED. DURING LANDING HOVER, LIGHT WENT OFF AGAIN. THEN AS THE AIRCRAFT WAS GOING THROUGH COOLDOWN THE LIGHT CAME ON AGAIN AND STAYED ON. PILOT SHUT DOWN AIRCRAFT AND NOTIFIED MAINTENANCE. MAINTENANCE FOUND NUMEROUS SMALL SILVER FLAKES ON LOWER AND A FEW ON UPPER TRANSMISSION CHIP DETECTORS. SERVICIBILITY CHECKS WERE GOOD WITH NO FURTHER CHIPS FOUND. CHIP ANALISYS AND OIL SAMPLES WERE SENT OFF FOR ANALYSIS. RECIVED WORD FROM THE MANUFACTURER PSE THAT THE CHIPS MATCHED METALS FROM M50 BEARING OF TRANSMISSION AND HAVE RECOMMENDED CHANGE OF MAIN ROTOR GEABOX

More about the Bell 407