ASN Wikibase Occurrence # 189128
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| Date: | Saturday 6 August 2016 |
| Time: | 11:45 |
| Type: |  Piper PA-28R-201 Arrow III |
| Owner/operator: | Northhampton Aeronautics |
| Registration: | N3783M |
| MSN: | 28R-7837137 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 10855 hours |
| Engine model: | Lycoming IO-360-C1C6 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Northampton Airport (7B2), Northampton, MA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Training |
| Departure airport: | Northampton, MA (7B2) |
| Northampton, MA (7B2) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight instructor indicated that, during a simulated soft-field takeoff on an instructional flight, the airplane's climb performance noticeably deteriorated. As the airplane reached about 150 ft above ground level, the engine started to lose power. The flight instructor chose to make an emergency off-airport landing, during which the right wing and firewall were substantially damaged. A postaccident examination of the airplane revealed that the alternate air valve plate was lodged in the air intake and blocked the fuel servo. Further examination revealed that the hinge pin that held the alternate air valve plate was worn completely through, which caused the plate assembly to separate from its mounting location and lodge in the fuel servo. This obstruction likely restricted the intake air to the engine and thus led to the loss of engine power on takeoff. Examination of the alternate air valve plate revealed that it had been altered from its original design, although there were no maintenance records documenting the alteration. The investigation could not determine whether this alteration contributed to the failure of the alternate air valve plate's mounting mechanism.
Probable Cause: The failure of the alternate air valve plate hinge pin, which caused the alternate air valve plate to lodge in the fuel servo assembly, which resulted in a restriction of air to the fuel servo assembly, a loss of engine power, and an off-airport emergency landing.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N3783M
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 06-Aug-2016 20:19 | Geno | Added |
| 07-Aug-2016 08:12 | bovine | Updated [Source] |
| 07-Aug-2016 08:12 | Anon. | Updated [Damage] |
| 09-Nov-2016 21:06 | Anon. | Updated [Total occupants, Phase] |
| 22-Apr-2020 17:01 | ASN Update Bot | Updated [Time, Operator, Departure airport, Destination airport, Source, Damage, Narrative, Accident report, ] |
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