SDR 96ZZZX2410

Service difficulty report · Shaft · Cessna 421C

Difficulty date: March 7, 1996
Submitted: March 26, 2000
Operation: General aviation
Aircraft: N215MP
Make and model: Cessna 421C
Aircraft serial: 421C1231
Engine: Cont GTSIO520H
System (JASC): 8540 · Reciprocating Engine Rear Section
Part: Shaft
Part number: 99101371
Condition: Sheared
Location: Rt Eng Hyd
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

FOUND DRIVE SHAFT ON AIR CONDITIONING, HYDRAULIC PUMP SHEARED. UPON REMOVAL, SYSTEM HYDRAULIC PUMP SHAFT SPLINES WERE FOUND WORN OUT AND RUSTED. SUBMITTER SUGGESTS SPLINES BE LUBED AT 200-HOUR INTERVALS TO PREVENT THIS PROBLEM FROM RECURRING.

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