# NTSB MKC85LA141: Cessna 150M, N704ZS, Rushville, MO, June 26, 1985

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: June 25, 1985, 19:10 local (Jun 26, 1985, 00:10 UTC)
- Place: Rushville, MO
- Coordinates: 39.580112, -95.019599 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.5801&lon=-95.0196&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 2 minor
- Status: Completed
- Report: Approved by Office Director
- Safety recommendations: Yes
- NTSB case key (mKey): 33971
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC85LA141
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33971/pdf
- Page: https://openairdocs.org/ntsb/MKC85LA141

## 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, cruise - normal
  - throttle/power lever,linkage - disconnected (cause)
  - maintenance,service bulletin/letter - not followed, other maintenance personnel (contributing factor)
- Forced landing, landing
- Nose over, landing
  - terrain condition - none suitable (contributing factor)
  - terrain condition - soft (contributing factor)
  - terrain condition - ditch (contributing factor)

## Analysis

SHORTLY AFTER THE PLT DEPARTED ON A FLT, THE ENG LOST POWER WHILE THE ACFT WAS CRUISING AT 1800 FT MSL OVER HILLY TERRAIN. THE PLT REPORTED THAT THE ENG SPEED DROPPED TO 800 RPM & HE WAS UNABLE TO CORRECT THE SITUATION. DURING A FORCED LANDING ON SOFT TERRAIN, THE ACFT ENCOUNTERED A DITCH & NOSED OVER. AN EXAM OF THE ACFT REVEALED THAT A SELF LOCKING, NAS679A3, SAFETY NUT HAD SEPARATED & THE RESPECTIVE BOLT HAD BACKED OUT, DISCONNECTING THE THROTTLE LINKAGE. THE NUT HAD 2569 OPERATIONAL HRS IN SERVICE & THE ACFT HAD FLOWN 44 HRS SINCE THE LAST ANNUAL INSPECTION. CESSNA SERVICE LETTER, SE 76-6, DATED 4/16/79, RECOMMENDED THAT THE NAS679A3 NUT BE REPLACED BY AN AN310 CASTELLATED NUT & COTTER PIN. AS OF THE DATE OF THE ACCIDENT, NO AIRWORTHINESS DIRECTIVE HAD BEEN ISSUED TO REQUIRE THE CHANGE.

## Aircraft

- Registration: [N704ZS](https://openairdocs.org/deregistered/N704ZS-2013-08-20), registration cancelled 2013-08-20, S/N 15079008, built 1976 (OpenAirDocs)
- Reported make and model: CESSNA 150M
- Registry model: [Cessna 150M](https://openairdocs.org/model/cessna-150m) (registry code 2071830) (OpenAirDocs)
- Registry engine: [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series) (registry code 17020, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 15079008
- Airframe hours: 2569
- Engines: CONTINENTAL O-200-A 100 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Riverbend Aviation
- Registered owner: Daniel Tate
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, February 16, 1985, 44 hours before
- Departed: K59, ATCHISON, KS

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 70; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 300 total, 200 in this make and model, 150 as pilot in command, 7 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 7 knots
- Visibility: 15 statute miles
- Lowest ceiling: none

## 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 19850625070919A](https://openairdocs.org/incident/19850625070919A), Jun 25, 1985: Cessna 150M, Rushville, MO, Substantial damage. Landed in a field and flipped after engine lost power in cruise. Throttle linkage nut separated from bolt.

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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