ASN Wikibase Occurrence # 154267
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| Date: | Monday 18 March 2013 |
| Time: | 14:05 |
| Type: |  Piper PA-25-235 Pawnee B |
| Owner/operator: | Aerial Banners Inc |
| Registration: | N86AB |
| MSN: | 25-3409 |
| Year of manufacture: | 1965 |
| Total airframe hrs: | 8100 hours |
| Engine model: | Lycoming O-540-B2C5 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Near Northwest Florida Beaches Int\'l Airport - KECP, Panama City, FL -
 United States of America
|
| Phase: | En route |
| Nature: | Banner and glider towing |
| Departure airport: | Panama City, FL (ECP) |
| Panama City, FL (ECP) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot departed and picked up an aerial advertising banner for a local flight. About 6 minutes later, the airplane’s engine suddenly lost all power. The pilot unsuccessfully attempted to troubleshoot the loss of engine power, jettisoned the banner at an altitude of about 500 feet, and performed a forced landing to a pine forest below, which resulted in substantial damage to the airplane. Postaccident examination of the engine revealed that the crankshaft gear alignment dowel had sheared and that the gear had rotated from its normal position. The gear’s attaching hardware remained installed and undamaged. Detailed examination of the gear and alignment dowel showed that their hardness was consistent with that required by the design and that they were within or nearly within nominal dimensional tolerances described by the manufacturer. The counter-bored pilot hole at the aft of the crankshaft where the gear was seated was between 0.0008 and 0.0013-inch oversized. There were no discrepancies found with the retaining bolt, and it could be threaded into the crankshaft with minimal resistance. A definitive cause for the loss of preload to the crankshaft gear attaching bolt could not be determined during the engine examination.
Review of maintenance records showed that the engine had been installed onto the accident airplane following an overhaul, which was originally precipitated by a propeller strike. The records provided that documented the overhaul and returned the airplane/engine to service lacked language specifying compliance with a manufacturer service bulletin that provided explicit instructions for the installation of the crankshaft gear to the crankshaft; however, the provided records did document part numbers and torque values consistent with those specified by the service bulletin.
Probable Cause: A loss of preload to the crankshaft gear attachment bolt, resulting in rotation of the crankshaft gear and a subsequent total loss of engine power. The root cause for the loss of preload could not be determined during a postaccident examination of the components.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=86AB
History of this aircraft
Other occurrences involving this aircraft
| 18 December 2005 | N86AB | Aerial Banners, Inc. | 0 | Opa-Locka, Florida | |
sub |
| 12 March 2015 | N86AB | Aerial Banners Inc | 0 | Everglades west of North Perry Airport (KHWO) Hollywood, FL | |
unk |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Mar-2013 17:10 | Geno | Added |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 28-Nov-2017 14:14 | ASN Update Bot | Updated [Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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