# NTSB CHI90LA238: Mooney M20B, N74745, Winfield, KS, August 18, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: August 18, 1990, 17:40 local (22:40 UTC)
- Place: Winfield, KS
- Coordinates: 37.259288, -96.960174 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.2593&lon=-96.9602&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report November 10, 1992
- Report: Approved by Office Director
- ADs cited in the narratives: [AD 73-21-01](https://openairdocs.org/ad/73-21-01) (OpenAirDocs)
- NTSB case key (mKey): 14756
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI90LA238
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14756/pdf
- Page: https://openairdocs.org/ntsb/CHI90LA238

## Probable cause

NON-COMPLIANCE OF AN AIRWORTHINESS DIRECTIVE BY MAINTENANCE PERSONNEL.

## Sequence of events

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

- Main gear collapsed, landing - roll
  - landing gear,normal retraction/extension assembly - incorrect (cause)
  - maintenance,compliance with ad - not performed, other maintenance personnel (cause)

## Analysis

THE LEFT MAIN LANDING GEAR COLLAPSED DURING LANDING ROLLOUT AND THE AIRPLANE DEPARTED THE LEFT SIDE OF THE RUNWAY. EXAMINATION OF THE AIRPLANE SHOWED THE LEFT MAIN GEAR RETRACTING TRUSS FAILED AT A WELD, ALLOWING THE GEAR TO COLLAPSE. THE FAILED PART HAS BEEN OBSOLETE SINCE THE ISSUANCE OF AD 73-21-01 WHICH DIRECTED REPLACEMENT OF RETRACTING LINKS ON MODEL M20 AIRPLANES AND REFERRED TO MOONEY SERVICE BULLETIN M20-155. THE BULLETIN FURTHER SPECIFIES THAT THIS AIRCRAFT BY SERIAL NUMBER REQUIRES REPLACEMENT OF THE RETRACTING TRUSSES TO UTILIZE THE NEW LINKS. THE AIRFRAME LOG SHOWED THE AD SIGNED OFF WITH 'NEW RETRACT LINKS' INSTALLED. RIGHT MAIN AND NOSE GEAR TRUSSES WERE ALSO ORIGINAL AND OBSOLETE.

## Aircraft

- Registration: [N74745](https://openairdocs.org/aircraft/N74745), registered now, S/N 1745, built 1961 (OpenAirDocs)
- Reported make and model: MOONEY M20B
- Registry model: [Mooney M20B](https://openairdocs.org/model/mooney-m20b) (registry code 5870206) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 1745
- Engines: LYCOMING O-360-A1A 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Clyde Clark
- Departed: 3A4, AUGUSTA, KS
- Airport: WLD, Strother Field, runway 17, 5,510 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 57; private; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 232 total, 78 in this make and model, 101 as pilot in command, 24 in the last 90 days, 21 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 200° at 21 knots, gusting 27
- Visibility: 15 statute miles
- Lowest ceiling: 6,000 ft broken
- Temperature: 88 °F, dew point 68 °F
- Altimeter: 29.00 inHg
- Observed at: ICT, 35 nm away

## 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 19900818035129A](https://openairdocs.org/incident/19900818035129A), Aug 18, 1990: Mooney M20B, Winfield/Arkans, KS, Substantial damage. Left main gear collapsed on landing roll. Retract truss failed at weld. AD on replacing truss not performed.

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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