# NTSB ANC91LA155: Piper PA-18-150, N4894A, Eagle, AK, September 19, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 19, 1991, 10:00 local (18:00 UTC)
- Place: Eagle, AK
- Coordinates: 64.429817, -141.219711 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=64.4298&lon=-141.2197&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report May 3, 1993
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5628
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC91LA155
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5628/pdf
- Page: https://openairdocs.org/ntsb/ANC91LA155

## Probable cause

THE DAMAGE SUSTAINED WHEN STRIKING A ROCK DURING THE PREVIOUS TAKEOFF ROLL WHICH RESULTED IN THE MAIN LANDING GEAR'S COLLAPSE DURING LANDING.

## Sequence of events

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

- On ground/water collision with object, takeoff - roll/run
  - terrain condition - rough/uneven (contributing factor)
- Gear collapsed, landing - roll
  - landing gear,main gear attachment - collapsed (cause)

## Analysis

THE PILOT STATED THAT DURING HIS TAKEOFF HE STRUCK A ROCK WHICH CAUSED DAMAGE TO THE MAIN LANDING GEAR.  UPON LANDING AT EAGLE, THE MAIN GEAR COLLAPSED AND BENT THE WING'S LIFT STRUTS.

## Aircraft

- Registration: [N4894A](https://openairdocs.org/aircraft/N4894A), registered now, S/N 18-4996, built 1956 (OpenAirDocs)
- Reported make and model: PIPER PA-18-150
- Registry model: [Piper PA-18-150](https://openairdocs.org/model/piper-pa-18-150) (registry code 7101828) (OpenAirDocs)
- Registry engine: [Lycoming O-320-A2B](https://openairdocs.org/engine/lycoming-o-320-a2b) (registry code 42101, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 18-4996
- Airframe hours: 2638
- Engines: LYCOMING 0320-A2B 150 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: Tatonduk Outfitters Ltd
- Registered owner: Efrem Razmuney
- Airworthiness certificate: Standard, Normal
- Last inspection: Continuous airworthiness, August 6, 1991, 62 hours before
- Departed: 40 MILE RIVER, AK
- Destination: EAA, EAGLE, AK
- Flight plan: Company VFR
- Airport: EAA, Eagle, runway 6, 3,500 × 150 ft, gravel

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 41; commercial; airplane ratings: single-engine land, single-engine sea, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: front; flight hours: 14,430 total, 472 in this make and model, 14,400 as pilot in command, 260 in the last 90 days, 82 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 90° at 15 knots, gusting 18
- Visibility: 10 statute miles
- Lowest ceiling: 8,000 ft broken
- Temperature: 55 °F

## 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 19910919043769A](https://openairdocs.org/incident/19910919043769A), Sep 19, 1991: Piper PA18150, Eagle, AK, Substantial damage. Struck rock on departing gravel bar. Stayed aloft but right main gear collapsed landing at base. Bent wing strut.

## Other investigations on N4894A (2)

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 ANC83LA147](https://openairdocs.org/ntsb/ANC83LA147), Aug 14, 1983: Piper PA-18-150 (N4894A), Eagle, AK, substantial damage
- [NTSB ANC70D0040](https://openairdocs.org/ntsb/ANC70D0040), Jun 25, 1969: Piper PA-18 (N4894A), Takotna, AK, 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.

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