Service difficulty report · Caliper · Bell 407

Difficulty date
August 22, 2021
Submitted
August 22, 2021
Operation
Air carrier
Aircraft
N414UH
Make and model
Bell 407
Aircraft serial
54458
Aircraft time
2,318 hours, 6,776 cycles
Part
Caliper
Part number
407540304101FM
Part serial
1287
Condition
Broken
Location
Lt Rotor Brake
Part time
1,172 hours, 3,047 cycles
Stage of operation
NR
How discovered
9
Nature of condition
O
Precautionary procedure
O

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

What was found

THE LEFT ROTOR BRAKE CALIPER LOWER MOUNTING EAR BROKE IN ADDITION TO THE TURN BUCKLE ATTACHMENT AT THE CALIPER WAS COMPROMISED. THIS RESULTED IN CONTACT BETWEEN THE CALIPER, ROTOR BRAKE ROTOR DISC AND ENGINE DRIVE SHAFT. MINOR DAMAGE WAS SUSTAINED TO THE ROTOR DISC AND DRIVESHAFT, BOTH ROTOR BRAKE DISC P.N. 407-340-318-101 AND DRIVESHAFT P.N. 407-340-310-101 WERE REPLACED WITH SERVICEABLE PARTS. THE ASSOCIATED TURN BUCKLE END P.N. MM-4M-40, LOCKING DEVICE P.N. NAS1193E4CP WITH JAM NUT P.N, NAS 1423-4 WERE RECOVERED FROM DECK OF AIRCRAFT ALSO REPLACED WITH SERVICEABLE PARTS.

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