SDR E81RJT2307930

Service difficulty report · Skin · Cessna 501

Difficulty date: July 21, 2011
Submitted: August 12, 2011
Operation: General aviation
Aircraft: N501NY
Make and model: Cessna 501
Aircraft serial: 5010038
Aircraft time: 7,751 hours, 7,355 cycles
Engine: Pwa JT15D1A
Engine time: 911 hours, 808 cycles
System (JASC): 7160 · Engine Air Intake System
Part: Skin
Condition: Damaged
Location: Inlet Duct
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

DURING SCHEDULED PHASE INSP OF ACFT PREVIOUSLY MODIFIED, STC ST09559AC, ENGINE INSTALLATION NOTED (2) MISSING RIVET HEADS IN LT ENGINE INLET DUCT SKIN. SUBSEQUENT INVESTIGATION REVEALED MINOR CRACK FROM RIVET HOLE. NO FOD DAMAGE NOTED TO ENGINE. INLET DUCT SKIN WAS REPAIRED. SRM SUPPLEMENT TEMPORARY REVISION 51-40-20. RECOMMEND STC HOLDER INVESTIGATE WHETHER INLET DUCT AND ATTACH RING LOOSE RIVETS AND CRACKING AT RELATIVELY LOW TIME IN SERVICE MAY REQUIRE DETAILED INSPECTION AND/OR MODIFICATION IAW SB ACTION.

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