# Accident 20140524020129A: Cessna 421A, Dallas, TX, May 24, 2014

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: May 24, 2014, 07:30 local time
- Place: Dallas, TX
- Damage: Substantial damage
- Phase of flight: Taxi
- Operating rules: General operating rules (Part 91)
- Location: 32.7378° N, 96.9692° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=32.7378&lon=-96.9692&mi=10
- Aircraft: N936U, a cancelled registration (https://openairdocs.org/deregistered/N936U-2018-02-07) (OpenAirDocs)
- Registry model: Cessna 421A (registry code 2076012, https://openairdocs.org/model/cessna-421a) (OpenAirDocs)
- Registry engine: Continental GTSIO-520-C (registry code 17035, https://openairdocs.org/engine/continental-gtsio-520-c) (OpenAirDocs)
- Reported make and model: CESSNA 421A
- Reported engine: CONT MOTOR GTSIO-520-D
- People aboard: 4
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Airline transport, flight instructor
- Pilot flight hours: 20,000 total, 20 in the last 90 days
- NTSB investigation: [NTSB CEN14CA310](https://openairdocs.org/ntsb/CEN14CA310) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20140524020129A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

THE ATP RATED PILOT AND HIS THREE PASSENGERS TAXIED FROM PARKING AT DALLAS EXECUTIVE AIRPORT (RDB) ON AN14 CFR PART 91, IFR CLEARANCE TO THE ASSIGNED RUNWAY, ONE-SEVEN VIA TAXIWAY ALPHA.  THE PILOT WAS AT THE INTERSECTION OF ALPHA-FOUR AND HAD JUST BEEN CLEARED TO CROSS RUNWAY ONE-SEVEN, WHEN THE RIGHT SIDE OF THE AIRCRAFT STARTED TO DROP.  THE RIGHT SIDE CONTINUED TO DROP UNTIL THE PROPELLER STRUCK THE PAVEMENT, CAUSING SUDDEN STOPPAGE OF THE ENGINE. THE AIRCRAFT CONTINUED TO DROP ON ITS RIGHT SIDE UNTIL THE RIGHT WING STRUCK THE PAVEMENT OF THE TAXIWAY.  THERE WAS NO RESULTING FIRE, EVEN THOUGH THE AIRCRAFT WAS FULL OF FUEL.

AN ON-SITE INVESTIGATION WAS CONDUCTED.  THIS INVESTIGATION REVEALED THAT THE RIGHT MAIN GEAR HAD COLLAPSED DUE TO A BROKEN LANDING GEAR OVER-CENTER DOWN LOCK AND THAT THE LANDING GEAR EXTENSION/RETRACTION TORQUE TUBE HAD CAUSED AN OVERLOAD CONDITION ON ITS MOUNTING/PIVOT BOSS ON THE RIGHT MAIN LANDING GEAR.  THE CAUSE OF THIS OVERLOAD IS UNKNOWN.

## The NTSB's investigation of this event (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 CEN14CA310](https://openairdocs.org/ntsb/CEN14CA310), May 24, 2014: Cessna 421A (N936U), Dallas, TX, substantial damage. Probable cause: The improper rigging of the landing gear by maintenance personnel, which resulted in the landing gear collapse.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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