ASN Wikibase Occurrence # 289544
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| Date: | Saturday 12 February 2011 |
| Time: | 11:50 LT |
| Type: |  Cessna 150L |
| Owner/operator: | Drake Aerial Enterprises LLC Dba |
| Registration: | N6622G |
| MSN: | 15072122 |
| Year of manufacture: | 1970 |
| Total airframe hrs: | 8201 hours |
| Engine model: | Lycoming O-360-A4A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Trenton, Michigan -
 United States of America
|
| Phase: | Standing |
| Nature: | Banner and glider towing |
| Departure airport: | Troy-Oakland Troy Airport, MI (KVLL) |
| Grosse Ile Municipal Airport, MI (KONZ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot had been conducting a banner towing operation for about 55 minutes when he felt a heavy vibration and heard a 'loud bang.†The airplane's engine subsequently lost power, and the pilot executed a forced landing. During the forced landing, the nose landing gear collapsed when it contacted "heavy snow and unimproved terrain," resulting in substantial damage to the firewall. A postaccident examination of the engine revealed that one of the connecting rods had separated from the crankshaft. Metallurgical examination determined that one of the two connecting rod bolts had failed in overstress. The second connecting rod bolt was deformed but otherwise intact; its associated nut had separated from the bolt and was undamaged. The lack of damage to one of the connecting rod nuts in conjunction with the overstress failure of the opposing bolt was consistent with a loss of installation torque on the intact nut. The engine had accumulated 2,836 hours since overhaul. The operator did not supply engine overhaul maintenance records but provided a statement indicating that the installed bolts and nuts were new at the engine cylinder's last maintenance (an engine manufacturer service bulletin instructs that connecting rod bolts and nuts be replaced any time they are removed). However, due to the lack of maintenance records and the number of hours since last overhaul, the investigation could not conclusively attribute the loss of preload torque to the overhaul operation.
Probable Cause: The loss of preload torque on a connecting rod nut and bolt, which precipitated a separation of the connecting rod from the engine's crankshaft and resulted in the total loss of engine power.
Accident investigation:
 |
|
Sources:
NTSB CEN11LA182
History of this aircraft
Other occurrences involving this aircraft
| 27 June 2016 | N6622G | Air America Aerial Ads | 0 | Coleman A Young Municipal Airport (KDET), Detroit, MI | |
sub |
| Collision with pole or wires | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Oct-2022 15:05 | ASN Update Bot | Added |
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