# NTSB FTW86LA158: Boeing A75N1, N7711J, Addison, TX, August 29, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: August 29, 1986, 14:30 local (19:30 UTC)
- Place: Addison, TX
- Coordinates: 32.959541, -96.829269 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=32.9595&lon=-96.8293&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 22082
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW86LA158
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/22082/pdf
- Page: https://openairdocs.org/ntsb/FTW86LA158

## Sequence of events

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

- Main gear collapsed, landing - roll
  - landing gear,main gear strut - fatigue (cause)

## Analysis

DURING THE LANDING ROLL, THE RIGHT MAIN LANDING GEAR COLLAPSED & SEPARATED FROM THE FUSELAGE. AN EXAM REVEALED THE RIGHT MAIN GEAR HAD FAILED DUE TO FATIGUE. THE ACFT HAD A TOTAL AIRFRAME TIME OF 1481 HRS.

## Aircraft

- Registration: [N7711J](https://openairdocs.org/aircraft/N7711J), registered now, S/N 75-4022, built 1942 (OpenAirDocs)
- Reported make and model: BOEING A75N1
- Registry model: [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17) (registry code 1380134) (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: 75-4022
- Airframe hours: 1481
- Engines: P&W R-985 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Merle W. Williams
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, April 18, 1986
- Departed: ADS
- Airport: AD5, Addison, runway 15, 7,200 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; private; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, valid medical--no waivers/lim.; seat: front; flight hours: 7,500 total, 58 in this make and model, 7,300 as pilot in command, 75 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 60° at 7 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 82 °F, dew point 54 °F
- Altimeter: 30.00 inHg

## 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 19860829043629A](https://openairdocs.org/incident/19860829043629A), Aug 29, 1986: Boeing A75N1, Dallas, TX, Substantial damage. Right main landing gear collapsed on a touch and go due to metal fatigue.

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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