19980702026829A

Accident · Substantial damage

FAA accident report · AMD FALCON900 · Hamilton, MT · July 2, 1998

Date
July 2, 1998 · 11:49 local
Place
Hamilton, MT
Airport
Ravalli County Airport
Phase of flight
Roll-Out (Fixed Wing)
Operating rules
General operating rules (Part 91)
Damage
Substantial damage
Aircraft
N900CS
NTSB investigation
NTSBSEA98LA118
Reported as
AMD FALCON900
Reported engine
Garrett TFE7315BR
People aboard
9
Fatal injuries
0
Pilot’s flight hours
9,316 total780 in this make and model78 in the last 90 days

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry 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.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

(.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.

As the FAA filed it

(.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.

NTSB investigation

The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.