ASN Wikibase Occurrence # 197082
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| Date: | Tuesday 1 August 2017 |
| Time: | 13:00 |
| Type: |  Grumman American AA-1B |
| Owner/operator: | Private |
| Registration: | N6216L |
| MSN: | AA1B-0016 |
| Year of manufacture: | 1972 |
| Total airframe hrs: | 4196 hours |
| Engine model: | Lycoming O320 A3A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Phoenix-Deer Valley Airport (KDVT), Phoenix, AZ -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Phoenix, AZ (DVT) |
| Sedona, AZ (SEZ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Shortly after the private pilot took off for the local flight, about 200 to 300 ft above ground level, the engine experienced a partial loss of power. The airport was bordered on the south, west, and north by buildings, and there were high-traffic arterial roads on both the west and south sides of the airport; the pilot turned the airplane back toward the departure runway to make an emergency landing to the east. During the turn, the pilot exceeded the airplane’s critical angle of attack, which resulted in an aerodynamic stall. The pilot was unable to regain control, and the airplane pitched nose down and subsequently impacted terrain and then collided with an airport perimeter fence and a tree before coming to rest.
Postaccident examination of the propeller blades revealed chordwise striations across the cambered surface, torsional twisting, and trailing edge “S” bending, consistent with the engine producing power at the time of impact. The engine teardown examination revealed that the No. 3 cylinder’s exhaust valve was stuck open, which would have degraded the engine power. Further, the exhaust valve stem and guide exhibited heavy combustion deposits, which likely led to the valve becoming stuck. No preaccident deficiencies were found with the cylinder.
Probable Cause: The partial loss of engine power during initial climb due to the No. 3 cylinder exhaust valve becoming stuck open due to deposit buildup in the exhaust valve stem and guide and the pilot’s exceedance of the airplane’s critical angle of attack while attempting to turn back to the airport, which resulted in an aerodynamic stall.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=6216L
Location
Media:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Aug-2017 22:45 | Geno | Added |
| 02-Aug-2017 05:43 | Iceman 29 | Updated [Time, Source, Embed code] |
| 02-Aug-2017 05:49 | Iceman 29 | Updated [Embed code] |
| 02-Aug-2017 07:40 | harro | Updated [Registration] |
| 22-Mar-2019 19:10 | ASN Update Bot | Updated [Time, Operator, Nature, Departure airport, Destination airport, Source, Embed code, Damage, Narrative, Accident report, ] |
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