# NTSB DEN83LA172: Cessna T188C, N2834J, Bozeman, MT, July 22, 1983

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 22, 1983, 10:30 local (16:30 UTC)
- Place: Bozeman, MT
- Coordinates: 45.770339, -110.929069 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.7703&lon=-110.9291&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): 16122
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN83LA172
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16122/pdf
- Page: https://openairdocs.org/ntsb/DEN83LA172

## Sequence of events

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

- Loss of engine power(total) - nonmechanical, maneuvering - aerial application
  - throttle/power control - improper use of, pilot in command (cause)
  - mixture - improper use of, pilot in command (cause)
  - load jettison - performed, pilot in command (cause)
- Forced landing, landing - flare/touchdown
- In flight collision with object, landing - flare/touchdown
  - object - tree(s) (contributing factor)

## Analysis

THE ACFT SETTLED INTO TREES AFTER THE ENGINE LOST POWER DURING A SWATH RUN. THE FLT HAD BEEN IN PROGRESS FOR ABOUT 15 MINUTES. THE PLT STARTED THE 4TH RUN AND THE ACFT STARTED TO SETTLE. THE PLT DUMPED THE LOAD BUT DID NOT TOUCH THE THROTTLE OR MIXTURE. HE HAD SET THE THROTTLE AND MIXTURE FOR THE OPERATION AND TIGHTENED THE FRICTION ADJUSTMENT. THE MIXTURE HAD BEEN LEANED TO PEAK TEMPERATURE AND THEN ENRICHED SO THE CYL HEAD TEMP WAS PEAK TEMP MINUS 125 DEGREES. THE MANIFOLD PRESSURE WAS 32 INCHES AND THE PROP SET AT 2400 RPM THE PILOT WAS ASKED ABOUT HIS USE OR POWER AND MIXTURE AND HE SAID HE DID NOT MOVE OR ADJUST THEM FROM THE TIME HE SET THEM AFTER INITIAL LEVELOFF UNTIL GROUND IMPACT. HE SAIDTHAT AFTER THE ACCIDENT THESE CONTROLS WERE IN A NORMAL FLT POSITION. THE PILOT WAS WEARING A HELMET AND SAID IT WOULD BE POSSIBLE FOR THE ENGINE TO STOP AND HIM NOT BE ABLE TO HEAR IT. FROM THE CONDITION OF THE PROPELLER IT WAS DETERMINEDTHAT THE ENGINE WAS NOT PRODUCING POWER AT IMPACT. DURING INSPECTION, NOTHING WAS FOUND WRONG WITH THE POWERPLANT.

## Aircraft

- Registration: [N2834J](https://openairdocs.org/deregistered/N2834J-1984-03-14), registration cancelled 1984-03-14, S/N T18803528T (OpenAirDocs)
- Reported make and model: CESSNA T188C
- Registry model: [Cessna T188C](https://openairdocs.org/model/cessna-t188c) (registry code 2073012) (OpenAirDocs)
- Category: Airplane
- Serial number: T18803528T
- Airframe hours: 760
- Engines: CONTINENTAL TS10-520-T 310 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Boyd J. Morgan
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: 100 hour, April 15, 1983

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 38; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 1,490 total, 40 in this make and model, 40 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 310° at 5 knots
- Visibility: 20 statute miles
- Lowest ceiling: 20,000 ft broken
- Temperature: 70 °F, dew point 48 °F
- Altimeter: 30.00 inHg
- Observed at: BZN, 7 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 19830722034519A](https://openairdocs.org/incident/19830722034519A), Jul 22, 1983: Cessna T188C, Bozeman, MT, Substantial damage. Engine lost power for unknown reasons and aircraft settled into trees during spraying operation.

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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