# Accident 20040817019379A: Unipro MONOCOACH, Pullman/Moscow, WA, August 17, 2004

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: August 17, 2004, 09:35 local time
- Place: Pullman/Moscow, WA
- Airport: Pullman - Moscow Regional
- Damage: Substantial damage
- Phase of flight: Roll-Out (Fixed Wing)
- Operating rules: General operating rules (Part 91)
- Location: 46.7486° N, 117.1356° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=46.7486&lon=-117.1356&mi=10
- Aircraft: N11872, registered now (https://openairdocs.org/aircraft/N11872) (OpenAirDocs)
- Registry model: Universal Moulded Products MONOCOACH (registry code 9250102, https://openairdocs.org/model/universal-moulded-products-monocoach) (OpenAirDocs)
- Registry engine: Wright 760A B D E&ET (registry code 67009, https://openairdocs.org/engine/wright-760a-b-d-e-et) (OpenAirDocs)
- Reported make and model: UNIPRO MONOCOACH
- People aboard: 2
- Fatal injuries: 0
- Pilot flight hours: 7,000 total, 11 in this make and model, 40 in the last 90 days
- NTSB investigation: [NTSB SEA04LA162](https://openairdocs.org/ntsb/SEA04LA162) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20040817019379A

## Narrative

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

(-23) THIS AIRCRAFT LANDED AT THE PULLMAN, WA AIRPORT WITH THE LEFT HAND LANDING GEAR DANGLING FROM THE AIRCRAFT. THE PILOT STATED THAT THE LANDING WAS AS SLOW AS POSSIBLE AND ON THE RIGHT HAND WHEEL. AT A SPEED BELOW 15 MILES PER HOUR, THE LEFT SIDE OF THE AIRCRAFT SETTLED TO THE SOD FURTHER DAMAGING THE LEFT GEAR, ALLOWING THE PROPELLER TO CONTACT THE GROUND, AND CAUSING THE FORWARD SPAR IN THE LEFT WING TO BREAK NEAR THE UPPER STRUT ATTACH POINT. THE RETAINING NUT WHICH HOLDS THE PISTON WAS ALLOWED TO TURN OFF IT'S THREADS WHEN THE NUT RETAINING CLIP FAILED AT THE JUNCTURE OF THE NUT AND PISTON THREADS. WHEN THIS NUT WAS FREE OF THE PISTON, THE PISTON CAME OUT OF IT'S STRUT ALLOWING THE GEAR (LEFT) TO DANGLE UNDER THE AIRCRAFT ATTACHED BY THE REAR AND FORWARD GEAR MOUNTING ATTACHMENTS ON THE LOWER LONGERONS.

## 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 SEA04LA162](https://openairdocs.org/ntsb/SEA04LA162), Aug 17, 2004: Universal Moulded Pdts. Monocoach (N11872), Pullman, WA, substantial damage. Probable cause: The failure of a landing gear oleo retaining nut safety clip (snap ring) at an unknown point in time, leading to the partial separation of the landing gear strut while in flight, and the full…

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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