# NTSB ANC90LA102: Grumman G21, N7811, King Salmon, AK, June 30, 1990

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: June 29, 1990, 16:52 local (Jun 30, 1990, 00:52 UTC)
- Place: King Salmon, AK
- Coordinates: 58.749767, -156.539062 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=58.7498&lon=-156.5391&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor, 1 uninjured
- Status: Completed, report February 12, 1993
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 5392
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC90LA102
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/5392/pdf
- Page: https://openairdocs.org/ntsb/ANC90LA102

## Probable cause

THE PILOT FAILED TO ADEQUATELY COMPENSATE FOR THE PREVAILING WIND CONDITIONS AND HIS FAILURE TO MAINTAIN DIRECTIONAL CONTROL. A CONTRIBUTING FACTOR WAS THE STRONG CROSSWIND COMPONENT.

## Sequence of events

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

- Loss of control - on ground/water, landing - roll
  - weather condition - crosswind (contributing factor)
  - directional control - not maintained, pilot in command (cause)
  - compensation for wind conditions - inadequate, pilot in command (cause)
- On ground/water encounter with terrain/water, landing - roll

## Analysis

THE PILOT REPORTED DIRECTIONAL CONTROL PROBLEMS WHILE LANDING IN A CROSSWIND OF 70-80 DEGREES AT 15 KNOTS OR GREATER. THE AIRPLANE TOUCHED DOWN IN THE CENTER OF THE RUNWAY, BUT QUICKLY VEERED TO THE LEFT AND WENT OFF THE RUNWAY. AN AIR TRAFFIC CONTROLLER WHO WITNESSED THE ACCIDENT SAID THAT IT APPEARED THAT A GUST OF WIND CAUSED THE RIGHT WING TO RISE SHORTLY AFTER LANDING, AND THAT THE AIRPLANE THEN VEERED TO THE LEFT. AN EXAMINATION OF THE LEFT MAIN LANDING GEAR, TIRE, AND BRAKE ASSEMBLY DISCLOSED NO ANOMALIES WITH ANY OF THE SYSTEMS OR STRUCTURE.

## Aircraft

- Registration: [N7811](https://openairdocs.org/aircraft/N7811), registered now, S/N B-122, built 1942 (OpenAirDocs)
- Reported make and model: GRUMMAN G21
- Registry model: [Grumman G-21A](https://openairdocs.org/model/grumman-g-21a) (registry code 3951204) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: B-122
- Airframe hours: 13121
- Engines: P&W R-985 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Public aircraft, Public use
- Registered owner: State Of Alaska
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, January 5, 1990, 58 hours before
- Departed: PTH, PORT HIEDEN, AK
- Flight plan: Company VFR
- Airport: AKN, King Salmon, runway 11, 8,500 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; commercial, airline transport, flight instructor; airplane ratings: multi-engine land, single-engine sea, multi-engine sea, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 4,500 total, 1,000 in this make and model, 38 in the last 90 days, 21 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 190° at 15 knots
- Visibility: 65 statute miles
- Lowest ceiling: none
- Temperature: 72 °F, dew point 46 °F
- Altimeter: 29.00 inHg
- Observed at: AKN

## 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 19900629023119A](https://openairdocs.org/incident/19900629023119A), Jun 29, 1990: Grumav G21, King Salmon, AK, Substantial damage. Lost control landing in a crosswind and veered off runway. Tried to go around too late,jumped ditch,hit embankment

## Other investigations on N7811 (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 ANC07CA053](https://openairdocs.org/ntsb/ANC07CA053), Jun 24, 2007: Grumman G21A (N7811), Dutch Harbor, AK, substantial damage. Probable cause: The pilot's inadequate compensation for wind conditions during the takeoff roll, which resulted in a loss of directional control and a nose over.

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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