SDR 99ZZZX4047

Service difficulty report · Universal · Bell 407

Difficulty date: October 6, 1999
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N407P
Make and model: Bell 407
Aircraft serial: 53028
System (JASC): 6300 · Main Rotor Drive System
Part: Universal
Part number: 406310405101
Condition: Failed
Location: M/R Pitch Link
Part time: 238 hours
Component: 406010413117
Stage of operation: IN
Nature of condition: O
Precautionary procedure: K

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

What was found

THE MAIN ROTOR TRUNNION BEARNG HAS A LIFE LIMIT OF 5,000 HOURS. THREE OF THEM HAVE FAILED WITH LESS THAN 1,000 HOURS TT. ONE AT 789 HOURS, ONE AT 761 HOURS, AND ONE AT 238 HOURS TT. EACH TIME THE BEARING WAS REJECTED FOR AXIAL PLAY BEYOND .005 INCH.

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