# Accident 19980604030839A: Bbavia 7GCB, Hailey, ID, June 4, 1998

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: June 4, 1998, 16:33 local time
- Place: Hailey, ID
- Airport: Friedman Memorial
- Damage: Substantial damage
- Phase of flight: Roll-Out (Fixed Wing)
- Operating rules: General operating rules (Part 91)
- Location: 43.5703° N, 114.2093° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=43.5703&lon=-114.2093&mi=10
- Aircraft: N912CP, registered now (https://openairdocs.org/aircraft/N912CP) (OpenAirDocs)
- Registry model: Champion 7GCB (registry code 21101PC, https://openairdocs.org/model/champion-7gcb) (OpenAirDocs)
- Registry engine: NONE (registry code 00000, https://openairdocs.org/engine/none) (OpenAirDocs)
- Reported make and model: BBAVIA 7GCB
- Reported engine: LYC O320A2B
- People aboard: 2
- Fatal injuries: 0
- Pilot flight hours: 5,125 total, 65 in this make and model, 82 in the last 90 days
- NTSB investigation: [NTSB SEA98LA087](https://openairdocs.org/ntsb/SEA98LA087) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19980604030839A

## Narrative

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

(.4) THE PILOT, FLYING FROM THE FRONT SEAT, WAS AWARE OF A TAILWHEEL SHIMMY CONDITION PRIOR TO THE FLIGHT. UPON TOUCHDOWN, THE A/C TAILWHEEL BEGAN TO OSCILLATE. MARKS ON THE RUNWAY SHOWED TAILWHEEL TIRES SCUFFING FROM THE TOUCHDOWN AREA AND BEYOND. A SECOND SOLID SCUFF MARK ASSOCIATED WITH THE LEFT WHEEL WAS OBSERVED AS BOTH SCUFF MARKS DIVERGED LEFT OF THE RUNWAY CENTERLINE. POST-CRASH EXAMINATION REVEALED THAT THE RIGHT REAR BRAKE-PEDAL HAD DISCONNECTED FROM THE CONNECTING ROD TO THE FORWARD RIGHT BRAKE-PEDAL AND THE DISCONNECTION RENDERED THE FORWARD RIGHT BRAKE-PEDAL UNUSABLE. THE DISCONNECTION OCCURRED AT THE RIGHT BRAKE-PEDAL ATTACH EYE, AND ONE SEPARATION SURFACE WAS OBSERVED TO BE CLEAN WHEREAS THE OPPOSING SIDE WAS DIRTY. CRACKS WERE OBSERVED INSIDE THE ATTACH EYE RADII, AS WELL AS THE OPPOSING END OF THE PEDAL. THE RIGHT-MAIN LANDING GEAR SEPARATED. EXAMINATION OF THE TAILWHEEL ASSEMBLY REVEALED THAT THE HEXAFONAL NUT WHICH HOLDS THE INNER LOCK RING IN PLACE HAD BECOME LOOSE ALLOWING THE LOCK RING TO SHIFT. THIS ALLOWED THE TWO LOCK RING PINS TO SHEAR, THUS ALLOWING THE TAILWHEEL TO OSCILLATE OR 'SHIMMY' DURING ROLL.                                                        (-23)SEE PTRS SEA98LA087

## 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 SEA98LA087](https://openairdocs.org/ntsb/SEA98LA087), Jun 4, 1998: Champion 7GCB (N912CP), Hailey, ID, substantial damage. Probable cause: The disconnection of the rear right-main brake pedal from the brake master cylinder, and the overloading of the right main landing gear. A factor was the oscillation of the tailwheel.

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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