ASN Wikibase Occurrence # 353459
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| Date: | Sunday 27 December 1998 |
| Time: | 13:58 |
| Type: |  Hughes OH-6A |
| Owner/operator: | U.S. Border Patrol |
| Registration: | N6638R |
| MSN: | 67-16198 |
| Total airframe hrs: | 6377 hours |
| Engine model: | Allison T63-A-720 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Laredo, TeXas -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | (KLRD) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The engine decelerated and the pilot heard the sound of the engine out audio and observed the red engine out warning light illuminated. When the pilot lowered the collective to enter an autorotation, the engine and rotor RPM increased. The pilot then rolled the throttle off to regain control of the engine RPM. During touchdown, the helicopter landed hard, and the main rotor blades contacted the tailboom. A test run of the engine in a test cell revealed that the engine RPM was not controllable above flight idle, and the engine had a tendency to overspeed and overtemp when the power was advanced. The engine power turbine governor was removed and replaced with an operational unit. The engine operated within normal operational parameters after the governor was replaced. Examination concluded that the failure of the governor's drive shaft bearings resulted in excessive radial and axial play of the drive shaft, which led to a reduced fuel flow to the engine.
Probable Cause: The loss of engine power as result of the failure of the power turbine governor. A factor was the lack of suitable terrain available to the pilot for the forced landing.
Accident investigation:
 |
|
Sources:
NTSB FTW99GA061
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Mar-2024 07:03 | ASN Update Bot | Added |
| 24-Apr-2024 11:54 | Nepa | Updated [Time, Location, Narrative, Operator] |
Corrections or additions? ... Edit this accident description
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