# NTSB DEN84LA192: Grumman G-164A, N8974H, Murdo, SD, June 23, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 23, 1984, 09:00 local (14:00 UTC)
- Place: Murdo, SD
- Coordinates: 43.880088, -100.710487 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.8801&lon=-100.7105&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): 16411
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN84LA192
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16411/pdf
- Page: https://openairdocs.org/ntsb/DEN84LA192

## 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, maneuvering - aerial application
  - engine assembly,valve,intake - failure,total (cause)
  - engine assembly,cylinder - separation (contributing factor)
- Forced landing, descent - emergency
- Nose over, landing - roll
  - terrain condition - open field (contributing factor)
  - terrain condition - soft (contributing factor)

## Analysis

THE PILOT REPORTED THE ENGINE FAILED WHILE HE WAS IN A PROCEDURE TURN. THE PILOT MADE A FORCED LANDING IN AN OPEN FIELD AND THE ACFT NOSED OVER. EXAMINATION OF THE ENGINE AFTER THE ACCIDENT REVEALED THE ENGINE 'SWALLOWED AN EXHAUST VALVE' THAT CAUSED THE 'CYLINDER HEAD TO BLOW OFF.'

## Aircraft

- Registration: [N8974H](https://openairdocs.org/aircraft/N8974H), registered now, S/N 1347, built 1974 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164A
- Registry model: [Grumman Acft ENG Cor-Schweizer G-164A](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164a) (registry code 3952801) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 1347
- Airframe hours: 3415
- Engines: P&W R-985 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Christopher L. Jung
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Unknown, March 14, 1984
- Departed: SD32, MURDO, SD
- Airport: SD32

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 23; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 2,074 total, 1,104 in this make and model, 1,980 as pilot in command, 250 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 320° at 7 knots
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point -0 °F
- Altimeter: 30.00 inHg
- Observed at: PIR, 50 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 19840623026549A](https://openairdocs.org/incident/19840623026549A), Jun 23, 1984: Scwzer G164A, Murdo, ND, Substantial damage. Engine swallowed a valve and blew a jug during a spray run. Nosed over landing in a soft field when engine stopped.

## Other investigations on N8974H (3)

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 SEA89LA121](https://openairdocs.org/ntsb/SEA89LA121), Jun 24, 1989: Grumman-Schweizer G-164A (N8974H), Colfax, WA, substantial damage. Probable cause: IMPROPER INSTALLATION OF THE CYLINDER ASSEMBLY. THE TERRAIN WAS NOT SUITABLE FOR A SUCCESSFUL FORCED LANDING.
- [NTSB SEA88LA135](https://openairdocs.org/ntsb/SEA88LA135), Jul 21, 1988: Schweizer G164A (N8974H), Colfax, WA, substantial damage
- [NTSB FTW82DA205](https://openairdocs.org/ntsb/FTW82DA205), Jun 1, 1982: Grumman G-164A (N8974H), Angleton, TX, destroyed

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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