SDR 95ZZZX1891

Service difficulty report · Crankshaft · Piper PA31P

Difficulty date: March 30, 1995
Submitted: March 26, 2000
Operation: Air carrier
Aircraft: N18MC
Make and model: Piper PA31P
Aircraft serial: 31P7300143
Engine: Lyc TIGO541E1A
System (JASC): 8520 · Reciprocating Engine Power Section
Part: Crankshaft
Part number: 75458
Condition: Ctweight Failed
Location: Nr 4
Part time: 2,200 hours
Stage of operation: CR
Nature of condition: R
Precautionary procedure: E, A

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

What was found

DURING CRUISE, LT ENGINE LOST POWER, OIL PRESSURE OKAY. ENGINE SHUT DOWN AND SAFE LANDING MADE. FOUND BOLTS BROKE ON NR 3 CYCLINDER CONNECTING ROD. ALSO, NR 4 COUNTERWEIGHT BROKE LOOSE FROM CRANKSHAFT DUE TO FAILURE OF ATTACH POINT ON CRANKSHAFT. NO PRIOR INDICATION OF FAILURE. SUSPECT COUNTERWEIGHT BROKE LOOSE CAUSING ROD TO FAIL.

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