# NTSB MKC86LA086: Grumman G164B, N6609Q, Advance, MO, April 12, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: April 12, 1986, 09:30 local (15:30 UTC)
- Place: Advance, MO
- Coordinates: 37.100566, -89.91082 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.1006&lon=-89.9108&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 34158
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC86LA086
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/34158/pdf
- Page: https://openairdocs.org/ntsb/MKC86LA086

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, maneuvering
  - ignition system,magneto - failure,total (cause)
- Forced landing, maneuvering
- Nose over, landing - roll

## Analysis

THE AIRPLANE WAS BEING OPERATED AS AN AGRICULTURAL AIRCRAFT WHEN THE ENGINE STARTED BACKFIRING AND THEN QUIT. DURING THE FORCED LANDING IN A PLOWED FIELD, THE AIRPLANE FLIPPED FORWARD TO THE INVERTED POSITION. INVESTIGATION REVEALED THE TEETH ON THE LEFT MAGNETO WERE ALL BROKEN OFF. A NEW MAGNETO AND A PROPELLER WERE INSTALLED AND AFTER GROUND RUN, THE ENGINE OPERATED NORMALLY. AFTER REPLACEMENT OF THE RUDDER, THE AIRPLANE WAS FLOWN OUT OF THE FIELD. AFTER REPLACEMENT OF THE ENGINE, THE AIRPLANE WILL BE RETURNED TO SERVICE.

## Aircraft

- Registration: [N6609Q](https://openairdocs.org/aircraft/N6609Q), registered now, S/N 136B, built 1976 (OpenAirDocs)
- Reported make and model: GRUMMAN G164B
- Registry model: [Grumman Acft ENG Cor-Schweizer G-164B](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164b) (registry code 3952802) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 136B
- Airframe hours: 3131
- Engines: P&W R-1340 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Jolliff Flying Service
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, April 1, 1985
- Departed: PLAINTON, MO

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; flight instructor, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: center; toxicology performed; flight hours: 8,774 total, 8,720 as pilot in command, 180 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 12 statute miles
- Lowest ceiling: none
- Temperature: 64 °F, dew point 54 °F
- Altimeter: 29.00 inHg
- Observed at: CGI, 16 nm away

## 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 19860412011559A](https://openairdocs.org/incident/19860412011559A), Apr 12, 1986: Scwzer G164B, Advance, MO, Substantial damage. Engine quit. Nosed over on forced landing. Gear teeth on left magneto were stripped.

## Other investigations on N6609Q (2)

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.

- [NTSB MKC87LA133](https://openairdocs.org/ntsb/MKC87LA133), Jul 9, 1987: Grumman G-164B (N6609Q), Mcdougal, AR, destroyed
- [NTSB IAD78DKM17](https://openairdocs.org/ntsb/IAD78DKM17), Jul 26, 1978: Grumman G-164B (N6609Q), Ellerbe, NC, substantial damage

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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