# NTSB CHI82DA235: Grumman American AA-1C, N9830U, Danville, IL, July 5, 1982

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Final report
- Date: July 5, 1982, 12:35 local (17:35 UTC)
- Place: Danville, IL
- Coordinates: 40.139762, -87.609397 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.1398&lon=-87.6094&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report July 5, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 70402
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI82DA235
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/70402/pdf
- Page: https://openairdocs.org/ntsb/CHI82DA235

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(total) - mech failure/malf, cruise - normal
  - engine assembly,other - loose (cause)
  - engine assembly,valve,intake - jammed (cause)
- Forced landing, landing
- In flight collision with terrain/water, landing - flare/touchdown
  - terrain condition - crop (contributing factor)

## Analysis

THE STUDENT PILOT STATED THAT AT 3000 FT, 14 NM NORTH OF THE DANVILLE VOR, THE ENGINE BEGAN VIBRATING. THE ENGINE LOST POWER AND THE PILOT WAS FORCED TO LAND IN A BEAN FIELD APPROXIMATELY 4 MILES NORTH OF THE DANVILLE AIRPORT. ENGINE EXAMINATION REVEALED THE ADJUSTMENT SCREW IN THE ROCKER ARM FOR THE NUMBER 4 INTAKE VALVE WORKED LOOSE PREVENTING THE VALVE FROM OPERATING.

## Aircraft

- Registration: [N9830U](https://openairdocs.org/deregistered/N9830U-1983-04-27), registration cancelled 1983-04-27, S/N AA1C0138 (OpenAirDocs)
- Reported make and model: GRUMMAN AMERICAN AA-1C
- Registry model: [Grumman American Avn. AA-1C](https://openairdocs.org/model/grumman-american-avn-aa-1c) (registry code 3960100) (OpenAirDocs)
- Category: Airplane
- Serial number: AA1-C0138
- Airframe hours: 2347
- Engines: LYCOMING O-235-L2C 115 horsepower reciprocating
- Damage: Destroyed
- Flight: Instructional, Part 91
- Operator: Bowman Aviation, Inc.
- Registered owner: Bowman Aviation, Inc.
- Departed: KANKAKEE, IL
- Destination: TERRE HAUTE, IN
- Flight plan: VFR
- Airport: DNV, Vernillion County

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; student; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; flight hours: 45 total, 45 in this make and model, 14 as pilot in command, 7 in the last 90 days, 3 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 150° at 4 knots
- Visibility: 10 statute miles
- Temperature: 190 °F
- Altimeter: 30.00 inHg

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19820705028389A](https://openairdocs.org/incident/19820705028389A), Jul 5, 1982: Gulstm AA1C, Danville, IL, Destroyed. Engine lost power, crash occurred during attempted emergency landing.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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