# NTSB LAX91LA367: Cessna R182, N9067C, Fredonia, AZ, August 23, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: August 23, 1991, 10:10 local (17:10 UTC)
- Place: Fredonia, AZ
- Location: 36.9617° N, 112.5162° W: Placed by OpenAirDocs: center of Fredonia, AZ, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=36.9617&lon=-112.5162&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report May 8, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 27335
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX91LA367
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/27335/pdf
- Page: https://openairdocs.org/ntsb/LAX91LA367

## Probable cause

FAILURE OF THE CARBURETOR MIXTURE CONTROL, RESULTING IN LOSS OF ENGINE POWER.  A FACTOR RELATED TO THE ACCIDENT WAS: LACK OF COMPLIANCE WITH MARVEL-SCHEBLER SERVICE BULLETIN (SB) #A1-78.

## Sequence of events

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

- Loss of engine power, cruise - normal
  - maintenance,service bulletin/letter - not followed, company maintenance personnel (contributing factor)
  - fuel system,carburetor - failure,total (cause)
  - mixture control - loose (cause)
- In flight collision with terrain/water, landing
  - terrain condition - rough/uneven (contributing factor)
- On ground/water collision with object, landing
  - object - tree(s) (contributing factor)

## Analysis

THE PLT & 3 PSGRS WERE ON A X-COUNTRY SIGHTSEEING FLT, WHEN THE ENG BGN TO RUN ROUGH, THEN LOST PWR.  SUBSEQUENTLY, THE ACFT COLLIDED WITH TRRN DRG A FORCED LANDING & HIT A TREE BFR IT CAME TO REST.  WHEN CHECKED AFTER THE ACDNT, THE ENG WOULD RUN, BUT ONLY AT IDLE.  THE ENG WAS EQUIPPED WITH A MARVEL-SCHEBLER MODEL HA-6 CARBURETOR (CARB). AS THE CARB WAS BEING REMOVED FM THE ENG FOR EXAMINATION, THE ROTARY MIXTURE CONTROL (PN 242-541) FELL OUT OF THE CARB HOUSING BECAUSE THE SHAFT RETAINING SCREW HAD BKN.  IN SEP 78, MARVEL-SCHEBLER/TILLOTSON (ORIGINAL MANUFACTURER OF THE CARB) ISSUED SVC BULLETIN (SB) #A1-78, BUT IT HAD NOT BEEN ACCOMPLISHED. THE SB PROVIDES FOR INSTLN OF A SPRING RETAINER (PN 55-A239) TO COUNTERACT END-PLAY WEAR ON THE MIXTURE CONTROL ASSEMBLY & RETAINING SCREW DUE TO VIBRATION.  THE SPRING RETAINER ALSO SERVES AS AN ADNL MEANS OF RETAINING THE ROTARY MIXTURE CONTROL, EVEN IF THE EXISTING SHAFT RETAINING SCREW IS WORN OR BKN.  THE ENG HAD A TOTAL OPERG TIME OF 2568 HRS, 485 HRS SINCE OVERHAUL & 4.7 HRS SINCE THE PREVIOUS 100 HR INSPN.

## Aircraft

- Registration: [N9067C](https://openairdocs.org/deregistered/N9067C-2013-03-18), registration cancelled 2013-03-18, S/N R18200383, built 1978 (OpenAirDocs)
- Reported make and model: CESSNA R182
- Registry model: [Cessna R182](https://openairdocs.org/model/cessna-r182) (registry code 2072734) (OpenAirDocs)
- Registry engine: [Lycoming 0-540 series](https://openairdocs.org/engine/lycoming-0-540-series) (registry code 41532, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: R18200383
- Airframe hours: 2568
- Engines: LYCOMING O-540-J3C5D 235 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: Lake Powell Air Service
- Registered owner: Aviation Services West Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, August 22, 1991, 5 hours before
- Departed: LAS, LAS VEGAS, NV
- Destination: L41, MARBLE CANYON, AZ
- Flight plan: Company VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 29; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 1,765 total, 15 in this make and model, 1,416 as pilot in command, 243 in the last 90 days, 107 in the last 30 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 70° at 10 knots, gusting 15
- Visibility: 60 statute miles
- Lowest ceiling: none
- Temperature: 95 °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 19910823036549A](https://openairdocs.org/incident/19910823036549A), Aug 23, 1991: Cessna R182, Fredonia, AZ, Substantial damage. Rough engine then quit. Landed on dirt road. Ran off at curve. Fuel cutoff valve retainer clip came off. Screw broke

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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