ASN Wikibase Occurrence # 287557
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| Date: | Saturday 21 July 2012 |
| Time: | 07:30 LT |
| Type: |  Mooney M20E |
| Owner/operator: | |
| Registration: | N1310W |
| MSN: | 198 |
| Year of manufacture: | 1963 |
| Total airframe hrs: | 5138 hours |
| Engine model: | Lycoming IO-360-A1A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Marked Tree, Arkansas -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | West Memphis Municipal Airport, AR (AWM/KAWM) |
| Sullivan Regional Airport, MO (KUUV) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that about 5 minutes after reaching cruise altitude, the engine started to run rough with an accompanying partial loss of power. He noted that the engine exhaust temperatures had dropped but that other engine indications were normal. The pilot elected to divert to an intermediate airport; however, the engine continued to lose power, and the pilot was unable to maintain a proper glide path to the runway. The pilot was concerned about an inadvertent aerodynamic stall, so he made a forced landing to the bean field short of the runway.
Postaccident bench testing of the engine fuel injection servo revealed variations in fuel flow that were not consistent with normal servo operation. Further examination of the fuel servo revealed that the mixture control valve O-ring was damaged and that a fragment of the O-ring was located on the surface of the mixture control valve plate. This likely interfered with fuel flow through the servo and reduced the available engine power. The fuel servo was overhauled about 1 year before the accident and had accumulated about 113 hours in service since the overhaul.
Probable Cause: The loss of engine power during cruise flight due to a malfunction of the fuel injection servo due to a damaged O-ring.
Accident investigation:
 |
|
Sources:
NTSB CEN12FA463
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Oct-2022 12:05 | ASN Update Bot | Added |
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