SDR EVCA201603152

Service difficulty report · Shaft · Bell 206L4

Difficulty date: March 11, 2016
Submitted: March 15, 2016
Operation: Air carrier
Aircraft: N440AE
Make and model: Bell 206L4
Aircraft serial: 52453
Aircraft time: 1,380 hours, 3,644 cycles
System (JASC): 6340 · Rotor Drive Indicating System
Part: Shaft
Part number: 20546AA
Condition: Jammed
Location: Main Rotor
Component: Tach Generator · Bell
Component part number: 206375202101
Stage of operation: IN
How discovered: V
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

WHILE REPLACING A LEAKING HYD PUMP & LEAKING TRANSMISSION OIL PUMP, IT WAS DISCOVERED THAT THE ROTOR TACH GEN TO HYD PUMP DRIVE SPLINES, SHAFT PN 20546AA, WERE SEIZED IN THE ROTOR TACH GEN. APPARENT CAUSE WAS OIL & HYD FLUID WASHING OUT LUBRICATING GREASE.

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