# NTSB SEA91LA086: Grumman G-21A, N9750Z, Spokane, WA, April 17, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: April 17, 1991, 10:30 local (17:30 UTC)
- Place: Spokane, WA
- Coordinates: 47.649436, -117.430587 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.6494&lon=-117.4306&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report March 31, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 41413
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA91LA086
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/41413/pdf
- Page: https://openairdocs.org/ntsb/SEA91LA086

## Probable cause

THE PILOT-IN-COMMAND DID NOT MAINTAIN DIRECTIONAL CONTROL OF THE AIRPLANE. FACTORS WERE: THE PIC'S INADEQUATE COMPENSATE FOR THE WIND, HIS LIMITED FLIGHT EXPEREINCE IN THIS TYPE OF AIRPLANE, AND THE CHECK AIRMAN'S POOR SUPERVISION.

## 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
  - directional control - not maintained, pilot in command (cause)
  - lack of total experience in type of aircraft, pilot in command (contributing factor)
  - ground loop/swerve - uncontrolled, pilot in command
  - compensation for wind conditions - inadequate, pilot in command (contributing factor)
  - supervision - poor, check pilot (contributing factor)
- On ground/water encounter with terrain/water, landing - roll

## Analysis

THE PILOT IN-COMMAND DID NOT MAINTAIN DIRECTIONAL CONTROL OF THE AIRPLANE. FACTORS WERE THE PIC'S INADEQUATE COMPENSATION FOR THE WIND, HIS LIMITED FLIGHT EXPEREINCE IN THIS TYPE OF AIRPLANE, AND THE CHECK AIRMAN'S POOR SUPERVISION.

## Aircraft

- Registration: [N9750Z](https://openairdocs.org/aircraft/N9750Z), registered now, S/N B-32 (OpenAirDocs)
- Reported make and model: GRUMMAN G-21A
- 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-32
- Engines: P&W R-985-AN14B 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Operator: Loel Fenwick
- Registered owner: Loel Fenwick
- Airport: GEG, Spokane Intl, runway 7, 8,199 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 46; private; airplane ratings: single-engine land, single-engine sea, multi-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; flight hours: 645 total, 6 in this make and model, 525 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: 30° at 12 knots
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: -0 °F, dew point -0 °F

## Other investigations on N9750Z (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 ANC80DA069](https://openairdocs.org/ntsb/ANC80DA069), Jul 20, 1980: Grumman G-21A (N9750Z), Juneau, 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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