# Accident 19980702026829A: Amd FALCON900, Hamilton, MT, July 2, 1998

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: July 2, 1998, 11:49 local time
- Place: Hamilton, MT
- Airport: Ravalli County Airport
- Damage: Substantial damage
- Phase of flight: Roll-Out (Fixed Wing)
- Operating rules: General operating rules (Part 91)
- Location: 46.1596° N, 114.1406° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=46.1596&lon=-114.1406&mi=10
- Aircraft: N900CS (not matched to a registry record)
- Reported make and model: AMD FALCON900
- Reported engine: GARRTT TFE7315BR
- People aboard: 9
- Fatal injuries: 0
- Pilot flight hours: 9,316 total, 780 in this make and model, 78 in the last 90 days
- NTSB investigation: [NTSB SEA98LA118](https://openairdocs.org/ntsb/SEA98LA118) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19980702026829A

## Narrative

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

(.4)THE PILOT REPORTED THAT, AFTER A NORMAL APPROACH AND TOUCHDOWN, HE APPLIED THE BRAKES AND THRUST REVERSERS. HE STATED THAT AS THE AIRCRAFT SLOWED TO 60 TO 70 KNOTS, IT VEERED TO THE RIGHT AND EXITED THE SIDE OF THE RUNWAY.  THE PILOT REGAINED DIRECTIONAL CONTROL AFTER THE AIRCRAFT EXITED THE RUNWAY.  BEFORE THE AIRCRAFT CAME TO A STOP, THE RIGHT WING COLLIDED WITH THE VASI LIGHTS FOR THE OPPOSITE RUNWAY.  SKID MARKS LEADING TO THE EXIT POINT ON THE RUNWAY, INDICATED THAT THE RIGHT-SIDE TIRE MARKS DISPLAYED HEAVIER BRAKING ACTION THAN ON THE LEFT SIDE.  POST-ACCIDENT TESTING PERFORMED ON THE ANTI-SKID GENERATORS REVEALED THAT THE LEFT-SIDE INBOARD AND OUTBOARD GENERATORS FAILED THE MANUFACTURER'S SPECIFICATIONS.  THE RIGHT-SIDE INBOARD AND OUTBOARD GENERATORS PASSED ALL MANUFACTURERS SPECIFICATIONS.  THE LEFT-SIDE GENERATORS WERE DISASSEMBLED.  THE INSPECTION DID NOT REVEAL ANY ANOMALIES.  A SLIGHT DIFFERENCE IN THE BRUSH WEAR BETWEEN THE BRUSH FITTINGS WAS NOTED BETWEEN THE TWO GENERATORS.  A SHORT CIRCUIT BETWEEN TWO ADJACENT COLLECTORS WAS FOUND IN THE OUTBOARD GENERATOR ROTOR FITTING.  THE MANUFACTURER'S REPRESENTATIVE REPORTED THAT THE SHORT CIRCUIT WAS NOT DUE TO A FAILUR E WITHIN A CELL OF THE ROTOR, BUT WAS LIKELY DUE TO CONTAMINATION PRESENT BETWEEN THE TWO COLLECTORS.

## 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 SEA98LA118](https://openairdocs.org/ntsb/SEA98LA118), Jul 2, 1998: Dassault Mystere Falcon 900 (N900CS), Hamilton, MT, substantial damage. Probable cause: Partial failure of the anti-skid brake system due to contamination.

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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