# NTSB SEA94LA101: Asher RV-6, N7057G, Enterprise, OR, April 15, 1994

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: April 15, 1994, 13:50 local (20:50 UTC)
- Place: Enterprise, OR
- Coordinates: 45.720657, -117.219177 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.7207&lon=-117.2192&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 1 uninjured
- Status: Completed, report December 2, 1994
- Report: Approved by Office Director
- NTSB case key (mKey): 41910
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA94LA101
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/41910/pdf
- Page: https://openairdocs.org/ntsb/SEA94LA101

## Probable cause

A LOSS OF POWER DUE TO A PARTIALLY BLOCKED INDUCTION AIR FILTER. FACTORS INCLUDE NO SUITABLE TERRAIN ON WHICH TO EXECUTE A FORCED LANDING.

## Sequence of events

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

- Loss of engine power(partial) - nonmechanical, takeoff - initial climb
  - induction air control,air filter/screen - blocked(partial) (cause)
- Forced landing, descent - emergency
- On ground/water encounter with terrain/water, landing - flare/touchdown
  - terrain condition - none suitable (contributing factor)

## Analysis

JUST AFTER TAKEOFF, THE AIRCRAFT EXPERIENCED A PARTIAL LOSS OF POWER, AND THE PILOT ELECTED TO ATTEMPT A FORCED LANDING ON THE NEARBY UNSUITABLE TERRAIN. INSPECTION OF THE AIRCRAFT REVEALED THAT THE INDUCTION AIR FILTER WAS PARTIALLY BLOCKED BY FRAGMENTS OF AN INSULATING MATERIAL THAT THE BUILDER HAD WRAPPED AROUND THE EXHAUST SYSTEM.

## Factual narrative

On April 15, 1994, approximately 1350 Pacific daylight time (PDT), the pilot of an Asher RV-6 experimental aircraft, N7057G, impacted the terrain during an attempted forced landing. The forced landing was initiated by the pilot after he experienced a loss of engine power during the initial takeoff climb from Enterprise Municipal Airport, Enterprise, Oregon. The certified flight instructor was not injured, his passenger received minor injuries, and the aircraft sustained substantial damage. The personal pleasure flight, which was departing for Afton, Wyoming, was operating in visual meteorological conditions at the time of the accident. The pilot had filed a VFR flight plan, and there was no report of an ELT activation.

According to the pilot, the engine experienced a rapid power loss just after takeoff, and he elected to attempt a forced landing on the unsuitable terrain off the end of the runway.

Inspection of the aircraft by an NTSB investigator and an FAA inspector revealed that the induction air filter had been partially blocked by fragments of an insulating material that the builder had wrapped around portions of the exhaust system.

## Aircraft

- Registration: [N7057G](https://openairdocs.org/aircraft/N7057G), registered now, S/N 20066 (OpenAirDocs)
- Reported make and model: ASHER RV-6
- Registry model: [Heath Donald E RV-6](https://openairdocs.org/model/heath-donald-e-rv-6) (registry code 05608BX) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 200066
- Engines: LYCOMING O-360-A1A 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Asher, Mervyn E.
- Airworthiness certificate: Special, Experimental (Special)
- Destination: AFO, AFTON, WY
- Flight plan: VFR
- Airport: 8S4, Interprise Municipal

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 62; flight instructor, commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 4,500 total, 104 in this make and model, 4,450 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 66 °F, dew point 30 °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 19940415007999A](https://openairdocs.org/incident/19940415007999A), Apr 15, 1994: Amtr RV6, Enterprise, OR, Substantial damage. Lost partial power on climbout. Elected land rough area. Induction air filter partly blocked by exhaust insulation.

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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