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ASN Wikibase Occurrence # 994
Last updated: 26 April 2019
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Date:05-JAN-2008
Time:15:45
Type:Silhouette image of generic C172 model; specific model in this crash may look slightly different
Cessna R172K
Owner/operator:Neil T. Wallace
Registration: N758FQ
C/n / msn: r1723064
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Category:Accident
Location:Nr. Spotsylvania, VA -   United States of America
Phase: En route
Nature:Private
Departure airport:Mannasas, VA (KHEF)
Destination airport:Newport News, VA (KPHF)
Investigating agency: NTSB
Narrative:
The pilot stated that he was on an IFR flight plan at 5,000 feet in VFR conditions, and in radio contact with approach control, when the engine started to run a little rough. A short time later, the pilot smelled fuel fumes and he was unable to determine the source. The pilot informed approach control that he needed to land, initiated a forced landing, and the engine stopped less than a minute later. The pilot stated that he elected not to make a traffic pattern. He used 10 degrees of flaps, the airplane touched down long about halfway down the field at about 90 knots, and collided with a fence and trees. Examination of the forced landing area revealed it was 1,050 feet long and other suitable forced landing areas were available in the immediate vicinity. The Pilot Operators Manual stated full flaps were recommended with an airspeed of 65 knots, and the landing distance required was 610 feet. Examination of the landing area revealed the airplane collided with a 3 to 4-foot tall fence pole 900 feet down the forced landing area before colliding with trees. The airplane traveled 1,100 feet before coming to a stop. The engine was transported to the manufacturer and disassembled. Examination of the engine revealed the No. 4 top spark plug insulator was cracked near the electrode. The No. 4 piston exhibited burn through erosion signatures consistent with a pre-ignition/detonation event allowing excessive crankcase pressure. The oil supply was evacuated through the crankcase breather resulting in the failure of the No. 2 connecting rod cap and loss of engine power.
Probable Cause: The pilot's failure to follow the checklist and failure to achieve the proper touchdown point during a forced landing. Contributing to the accident was a loss of engine power due to a cracked No. 4 top sparkplug insulator, resulting in pre-ignition/detonation and the failure of the No. 2 connecting rod cap due to evacuation of the oil supply.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20080115X00047&key=1


Revision history:

Date/timeContributorUpdates
25-Jan-2008 03:18 JINX Added
21-Dec-2016 19:13 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:14 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:16 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:20 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
03-Dec-2017 09:25 ASN Update Bot Updated [Cn, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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