# NTSB SEA89LA171: Yakovlev YAK 11, N134JK, Reno, NV, September 11, 1989

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: September 11, 1989, 15:00 local (22:00 UTC)
- Place: Reno, NV
- Coordinates: 39.710006, -119.819511 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.7100&lon=-119.8195&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report June 22, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 41079
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA89LA171
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/41079/pdf
- Page: https://openairdocs.org/ntsb/SEA89LA171

## Probable cause

THE RIGHT MAIN LANDING GEAR DID NOT FULLY EXTEND FOR AN UNDETERMINED REASON. FACTORS THAT CONTRIBUTED TO THE ACCIDENT WERE: AN ENGINE POWER LOSS FOR UNKNOWN REASONS AND THE ROUGH TERRAIN.

## Sequence of events

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

- Loss of engine power, climb - to cruise
  - reason for occurrence undetermined (contributing factor)
- Forced landing, landing - flare/touchdown
- Gear not extended, landing - flare/touchdown
  - landing gear,normal retraction/extension assembly - undetermined (cause)
- On ground/water encounter with terrain/water, landing - flare/touchdown
  - terrain condition - rough/uneven (contributing factor)

## Analysis

SHORTLY AFTER TAKE-OFF, THE PILOT NOTED THAT THE CYLINDER HEAD TEMPERATURE AND THE OIL TEMPERATURE WERE NEAR REDLINE. THE PILOT REDUCED POWER AND NOTED THAT THE MANIFOLD PRESSURE WAS BELOW NORMAL. THE PILOT TURNED BACK TO THE RUNWAY AND WAS ABLE TO EXTEND THE LEFT MAIN LANDING GEAR AND THE TAIL WHEEL ONLY. THE AIRPLANE LANDED ON THE RUNWAY WITH POWER AT IDLE. THE AIRPLANE SLIDE OFF THE RUNWAY AND BROKE APART AS IT SLID TO A STOP ON THE ROUGH TERRAIN. THE AIRPLANE WAS TO PARTICIPATE IN AN AIR RACE AND WAS TEST RUNNING THE ENGINE PRIOR TO THE START. THE ENGINE HAD BEEN MODIFIED FOR THE PURPOSE OF AIR RACING.

## Aircraft

- Registration: N134JK (not matched to a registry record)
- Reported make and model: YAKOVLEV YAK 11
- Category: Airplane, amateur-built
- Serial number: 171521
- Airframe hours: 1000
- Engines: WRIGHT R3350-36W 3700 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Anderson, Neil R.
- Registered owner: Kasparoff, Joseph
- Airworthiness certificate: Special, Experimental (Special)
- Airport: 4SD, Stead Fld, runway 14, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 56; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: front; flight hours: 9,800 total, 45 in this make and model, 9,000 as pilot in command, 40 in the last 90 days, 12 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 90° at 6 knots
- Visibility: 10 statute miles
- Temperature: 45 °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 19890911037629A](https://openairdocs.org/incident/19890911037629A), Sep 11, 1989: Amtr YAK11, Reno, NV, Substantial damage. Engine overheated on climbout and low oil pressure. Turned back. Unable lower left gear, landed, slid off runway.

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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