# NTSB DEN87LA154: Mooney M20E, N6933U, Harwood, ND, June 7, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 7, 1987, 14:00 local (19:00 UTC)
- Place: Harwood, ND
- Coordinates: 46.979454, -96.869873 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=46.9795&lon=-96.8699&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report May 9, 1988
- Report: Approved by Office Director
- NTSB case key (mKey): 17247
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN87LA154
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/17247/pdf
- Page: https://openairdocs.org/ntsb/DEN87LA154

## Sequence of events

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

- Complete gear collapsed, landing - flare/touchdown
  - gear extension - performed, pilot in command
  - gear down and locked - not identified, pilot in command (cause)
  - checklist - not used, pilot in command (cause)

## Analysis

THE PLT WAS LANDING HIS MOONEY M20E ON A PRIVATE GRASS AIRSTRIP. HE SAID HE LOWERED THE MANUAL LANDING GEAR AND THOUGHT HE FELT THE THUMBLOCK SNAP INTO PLACE. UPON TOUCHDOWN THE LANDING GEAR FOLDED UP AND THE ACFT SLID TO A STOP, RESULTING IN SUBSTANTIAL DAMAGE. THE OWNER'S MANUAL CAUTIONS PLTS TO MAKE THREE CHECKS TO ASCERTAIN THAT THE LANDING GEAR IS DOWN AND LOCKED: 1. PHYSICAL THUMBLOCK CHECK; 2. VISUAL GEAR LIGHT CHECK; 3. AUDIBLE GEAR HORN CHECK FROM RETARDED THROTTLE. ASKED IF HE AHD CHECKED TO SEE IF HE HAD A SAFE/GEAR DOWN AND LOCKED GREEN LIGHT INDICATION, THE PLT SAID HE THOUGHT HE HAD. HE SAID HE DIDN'T REMEMBER IF THE GEAR UNSAFE WARNING HORN EVER SOUNDED.

## Aircraft

- Registration: [N6933U](https://openairdocs.org/aircraft/N6933U), registered now, S/N 303 (OpenAirDocs)
- Reported make and model: MOONEY M20E
- Registry model: [Mooney M20E](https://openairdocs.org/model/mooney-m20e) (registry code 5870212) (OpenAirDocs)
- Registry engine: [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series) (registry code 41515, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 303
- Airframe hours: 2745
- Engines: LYCOMING IO-360-A1A 200 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Keith W. Schonert
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, March 2, 1987
- Departed: D54, WEST FARGO, ND
- Airport: runway 29, 1,900 × 50 ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: left; flight hours: 350 total, 350 in this make and model, 240 as pilot in command, 40 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 280° at 8 knots
- Visibility: 20 statute miles
- Lowest ceiling: none

## 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 19870607021029A](https://openairdocs.org/incident/19870607021029A), Jun 7, 1987: Mooney M20E, Harwood, ND, Substantial damage. The gear collapsed on landing. The pilot failed to check wheels down indicators.

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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