# NTSB ANC92LA142: Cessna 140, N77073, Wasilla, AK, August 23, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: August 23, 1992, 15:30 local (23:30 UTC)
- Place: Wasilla, AK
- Location: 61.5785° N, 149.4763° W: Placed by OpenAirDocs: center of Wasilla, AK, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=61.5785&lon=-149.4763&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report September 28, 1993
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5788
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC92LA142
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5788/pdf
- Page: https://openairdocs.org/ntsb/ANC92LA142

## Probable cause

THE PARTIAL LOSS OF ENGINE POWER DUE TO THE SEPARATION OF THE RIGHT HAND EXHAUST STACK.  CONTRIBUTING TO THE ACCIDENT WAS THE UNSUITABLE TERRAIN ON WHICH THE FORCED LANDING WAS MADE.

## Analysis

DURING CRUISE FLIGHT THE PILOT EXPERIENCED A PARTIAL LOSS OF ENGINE POWER, AND MADE AN OFF AIRPORT FORCED LANDING, WHICH RESULTED IN SUBSTANTIAL DAMAGE TO THE AIRPLANE.  EXAMINATION FOUND THAT A PIECE OF THE RIGHT HAND EXHAUST STACK HAD SEPARATED AT THE CONFLUENCE OF THE CARBURETOR HEAT EXTRACTION AREA.  THE ENGINE OPERATED NORMALLY FOLLOWING THE ACCIDENT.

## 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, cruise - normal
  - exhaust system,stack - separation (cause)
- Forced landing, descent - emergency
- Main gear collapsed, landing - flare/touchdown
  - terrain condition - none suitable (contributing factor)
- Dragged wing,rotor,pod,float or tail/skid, landing - roll

## Aircraft

- Registration: [N77073](https://openairdocs.org/deregistered/N77073-2017-02-04), registration cancelled 2017-02-04, S/N 11527, built 1946 (OpenAirDocs)
- Reported make and model: CESSNA 140
- Registry model: [Cessna 140](https://openairdocs.org/model/cessna-140) (registry code 2071602) (OpenAirDocs)
- Registry engine: [Continental C85 series](https://openairdocs.org/engine/continental-c85-series) (registry code 17008, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 11527
- Airframe hours: 2700
- Engines: LYCOMING O-290-D 125 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: William H. Hall
- Registered owner: William H. Hall
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, October 5, 1991, 1 hours before
- Departed: Z16, WASILLA, AK
- Destination: WICK'S AIRSTRIP, AK

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 47; private; airplane ratings: multi-engine land, single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 588 total, 1 in this make and model, 534 as pilot in command, 1 in the last 90 days, 1 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 10 statute miles
- Lowest ceiling: 5,000 ft broken
- Temperature: 61 °F, dew point 55 °F
- Altimeter: 29.00 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 19920823032879A](https://openairdocs.org/incident/19920823032879A), Aug 23, 1992: Cessna 140, Wasilla, AK, Substantial damage. Lost power. Landed in rough terrain. Found right exhaust sack was missing. Allowed hot exhaust gas over air intake.

## Other investigations on N77073 (1)

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 CHI71FBJ70](https://openairdocs.org/ntsb/CHI71FBJ70), Apr 22, 1971: Cessna 140 (N77073), Fulton, MI, substantial damage

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.