# NTSB SEA83FA093: Beech 77, N67140, Renton, WA, April 29, 1983

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: April 29, 1983, 14:05 local (21:05 UTC)
- Place: Renton, WA
- Coordinates: 47.46088, -122.209815 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.4609&lon=-122.2098&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 2 fatal
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 39607
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA83FA093
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/39607/pdf
- Page: https://openairdocs.org/ntsb/SEA83FA093

## 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, takeoff - initial climb
  - engine assembly,other - undertorqued (cause)
  - maintenance,adjustment - improper, company maintenance personnel (cause)
  - engine assembly,valve,intake - inoperative
- Forced landing, approach
  - emergency procedure - initiated, pilot in command (contributing factor)
- Loss of control - in flight, maneuvering - turn to landing area (emergency)
  - airspeed - not maintained, pilot in command (cause)
  - stall - inadvertent, pilot in command (cause)
  - lack of total experience in type of aircraft, pilot in command (contributing factor)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE ACFT WAS TAKING OFF FOR A 1 HOUR ENGINE RUN-IN FOLLOWING A TOP OVERHAUL. AFTER LIFTOFF THE ENGINE BEGAN A GRADUAL POWER LOSS AND ROUGH RUNNING. THE PILOT WAS TRYING TURNING BACK TO THE RUNWAY TO LAND WHEN TOTAL POWER LOSS OCCURRED. THE ACFT HAD TURNED 45 DEGREES WHEN THE NOSE FELL THROUGH, THE WINGS ROTATED 180 DEGREES TO THE LEFT AND THE ACFT IMPACTED NOSE FIRST ON THE RUNWAY. THE MECHANIC WHO PERFORMED THE REMOVAL AND REINSTALLATION OF THE CYLINDERS FOR THE TOP OVERHAUL WAS OCCUPYING THE LEFT SEAT. THE MAINTENANCE SUPERVISOR WAS THE PILOT-IN-COMMAND IN THE RIGHT SEAT. THE LOCKING NUT ON THE #1 CYLINDER EXHAUST VALVE ADJUSTING SCREW WAS FOUND LOOSE AND THE ADJUSTING SCREW HAD BACKED OUT OF THE ROCKER ARM BY PUSHROD ACTION DURING TAKEOFF, NEGATING ROCKER ARM ACTION AND EXHAUST VALVE OPENING. THE LOCKING NUTS FOR ALL OF THE OTHER VALVE ADJUSTING SCREWS WERE FOUND PROPERLY TORQUED.

## Aircraft

- Registration: [N67140](https://openairdocs.org/deregistered/N67140-2013-05-01), registration cancelled 2013-05-01, S/N WA-66, built 1979 (OpenAirDocs)
- Reported make and model: BEECH 77
- Registry model: [Beech 77](https://openairdocs.org/model/beech-77) (registry code 1153007) (OpenAirDocs)
- Registry engine: [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series) (registry code 41505, 4 cycle) (OpenAirDocs)
- Category: Airplane
- Serial number: WA66
- Airframe hours: 679
- Engines: LYCOMING O-235-L2C 115 horsepower reciprocating
- Damage: Destroyed
- Flight: Part 91
- Operator: Fancher Flyways
- Registered owner: Mcewen Thomas Kenneth
- Airworthiness certificate: Standard, Utility
- Last inspection: Annual, December 3, 1982, 103 hours before
- Airport: RNT, Renton, runway 15, 5,379 × 200 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 26; commercial, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: right; toxicology performed; flight hours: 473 total, 7 in this make and model, 346 as pilot in command, 168 in the last 90 days, 145 in the last 30 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 150° at 10 knots
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 64 °F, dew point 52 °F
- Altimeter: 29.00 inHg
- Observed at: RNT

## 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 19830429016759A](https://openairdocs.org/incident/19830429016759A), Apr 29, 1983: Beech 77, Renton, WA, Destroyed. Engine malfunction during takeoff caused pilot to attempt 180 turn back to runway. Aircraft stalled and crashed.

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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