ERA15LA276 · Grumman American AVN. CORP. AA1B
Grumman American AVN. CORP. AA1B · Accident: loss of engine power (partial) on approach
From Lancaster Airport (LNS) to Lancaster Airport (LNS)
Event
- NTSB case
- ERA15LA276
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- 0
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Grumman American AVN. CORP. AA1B
- Aircraft type
- Grumman American AA1
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N8969L
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Lancaster Airport (LNS), Lititz, PATo Lancaster Airport (LNS), Lititz, PA
- Aircraft age
- About 41 years (built 1974)
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Approach · VFR pattern base
- Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Loss of engine power (partial)
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Not determined › Not determined
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
The flight instructor reported that he and a student pilot were performing touch-and-go landings in the airport traffic pattern at night; the instructor was flying the airplane. While on the downwind leg for the third and final landing, he reduced the engine power and the engine subsequently experienced a partial loss of power. The instructor switched the fuel tank selector and attempted to restore power, but was unsuccessful. He then performed a forced landing to a cornfield, during which the airplane nosed over. The instructor's statement did not address whether he used carburetor heat during the accident flight, and the carburetor heat control was found in the full-forward (off) position.
An examination of the wreckage revealed no evidence of preimpact mechanical anomalies with the airframe or engine. The spark plugs were light gray in color and exhibited normal wear. The fuel quantity onboard the airplane at the time of the accident could not be determined. Although the weather conditions at the time of the accident were conducive to the accumulation of carburetor icing at glide power, the reason for the loss of engine power could not be determined.
Probable cause
A partial loss of engine power for reasons that could not be determined because postaccident examination of the engine found no mechanical malfunctions or failures that would have precluded normal operation.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ERA15LA276
- Event ID
- 20150722X24420
- Case number
- ERA15LA276
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: local date, investigation status, coordinates. Values present in the bulk record are kept.
- The date is the local date; the NTSB stores the UTC date 2015-07-19.
- API snapshot SHA-256: 0944b4196445a0750da23aad1adb29843adfe2d0a4a10618b4a6e954fbe52245; retrieved 2026-09-16T02:33:31.926Z.