ASN Wikibase Occurrence # 141544
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| Date: | Tuesday 3 January 2012 |
| Time: | 21:45 |
| Type: |  Cessna 172P Skyhawk II |
| Owner/operator: | Civil Air Patrol |
| Registration: | N54872 |
| MSN: | 172-75074 |
| Total airframe hrs: | 4757 hours |
| Engine model: | Lycoming O-360-A4M |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Conroe, TX -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Houston-West Houston Airport, TX (IWS/KIWS) |
| Conroe-North Houston Regional Airport, TX (CXO/KCXO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airplane was at 1,600 feet mean sea level with the engine power set at 2,300 rpm. When the airplane was about 6 miles from the airport, the pilot heard a loud “boom” and the engine lost all power. The pilot did not have sufficient altitude to glide to the airport, so he landed the airplane on 6th Street. When the airplane was on final approach to land, it collided with power lines. The pilot was able to land the airplane, but was forced to swerve to the right to avoid oncoming traffic. The right wing struck a utility pole, which resulted in substantial damage.
A postaccident engine examination revealed that when the crankshaft was turned, there was no movement of the intake or exhaust valves or magneto gears. The rear crank gear bolt was loose and the gear dowel pin was sheared, which would cause the camshaft and rear accessory gears to stop turning. Metallurgical examination revealed beach markings at the aft end of the crankshaft approximately in plane with the aft face of the crankshaft where it mated to the crankshaft gear. There was fretting damage on the crankshaft gear, wear on the dowel pins, and wear on the lock washer, indicative of movement as a result of insufficient clamping force from the attachment bolt at the time of installation. The engine had accrued 752 hours since it was overhauled in August 2007.
Probable Cause: Failure of the rear crankshaft gear dowel pin due to improper installation, which resulted in a total loss of engine power.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Jan-2012 04:49 | gerard57 | Added |
| 04-Jan-2012 05:46 | gerard57 | Updated [Aircraft type] |
| 04-Jan-2012 05:46 | PC 12 | Updated [Aircraft type, Cn, Operator] |
| 04-Jan-2012 15:10 | Alpine Flight | Updated [Time, Aircraft type, Operator, Location, Departure airport] |
| 04-Jan-2012 22:53 | RobertMB | Updated [Source, Narrative] |
| 13-Jan-2012 13:56 | Dr. John Smith | Updated [Time, Location, Destination airport, Source, Narrative] |
| 13-Jan-2012 14:08 | Dr. John Smith | Updated [Location, Source, Narrative] |
| 22-May-2012 22:26 | Geno | Updated [Location, Source, Narrative] |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 17:53 | ASN Update Bot | Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
| 31-May-2023 13:50 | Ron Averes | Updated [[Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]] |
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