# Incident 20150528007729I: Grumman American Avn. Corp. AA-5B, Springfield, KY, May 28, 2015

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: May 28, 2015, 14:09 local time
- Place: Springfield, KY
- Damage: No damage
- Phase of flight: Cruise/Level Flight
- Operating rules: General operating rules (Part 91)
- Location: 37.6947° N, 85.2178° W: Placed by OpenAirDocs: center of Springfield, KY, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.6947&lon=-85.2178&mi=10
- Aircraft: N28314, registered now (https://openairdocs.org/aircraft/N28314) (OpenAirDocs)
- Registry model: Grumman American Avn. AA-5B (registry code 3960105, https://openairdocs.org/model/grumman-american-avn-aa-5b) (OpenAirDocs)
- Reported make and model: GRUMMAN AMERICAN AVN. CORP. AA-5B
- Reported engine: LYCOMING O-360
- People aboard: 1
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Private pilot
- Pilot flight hours: 661 total, 13 in this make and model, 6 in the last 90 days
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20150528007729I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

PILOT WAS ON SPECIAL FLIGHT PERMIT DUE TO AIRCRAFT OUT OF ANNUAL.  IN CRUISE AT 5,500', 1.5 HOURS INTO THE FLIGHT, THE PILOT HEARD LOUD POPPING NOISE FROM THE ENGINE WITH SUBSEQUENT UNCOMMANDED REDUCTION IN POWER TO 1900 RPM AND THEN 1200.  THE PILOT, UNABLE TO MAINTAIN ALTITUDE, DECLARED AN EMERGENCY AND LANDED ON A HIGHWAY.

INVESTIGATION REVEALED VALVE GUIDES HAD SOME CARBON BUILDUP POSSIBLY LEADING TO STUCK EXHAUST VALVE(S) AT OPERATING TEMPERATURE AND POWER. ADDITIONALLY, TWO CYLINDERS HAD LOW COMPRESSION AS THEY WERE BORED TO .10 OVER AND PAIRED WITH STANDARD SIZE (MIS-MATCHED) CYLINDERS.

## Other reports on N28314 (1)

Matched to the same aircraft by N-number and date.

- [Incident 20030924025139I](https://openairdocs.org/incident/20030924025139I), Sep 24, 2003: Amrgen AA5B (N28314), Washington, IN, Minor damage. (-23) The flight was conducted at 3,000 feet when the pilot noticed that the engine began to run rough as if one cylinder was not working. Engine continually…

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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