ASN Wikibase Occurrence # 286940
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| Date: | Thursday 4 June 2009 |
| Time: | 07:50 LT |
| Type: |  Hughes OH-6A |
| Owner/operator: | U.S. Department of Homeland Security |
| Registration: | N6641D |
| MSN: | 66-07855 |
| Year of manufacture: | 1967 |
| Total airframe hrs: | 6141 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Benson, AZ -
 United States of America
|
| Phase: | Landing |
| Nature: | Unknown |
| Departure airport: | Tucson International Airport, AZ (TUS/KTUS) |
| Benson, AZ (E95) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The instructor pilot reported that they were practicing autorotations to the runway. During a straight-in autorotation at approximately 200 feet above ground level, the instructor called for an increase in throttle to bring rotor rpm into the normal operating range in preparation for landing. Between 200 feet and 100 feet agl, the instructor assisted the flying pilot with the throttle increase when he realized that the pilot had delayed throttle application. The flying pilot then initiated the flare at approximately 50 feet agl. The flying pilot leveled the helicopter and applied collective to slow the descent rate. Upon realizing that the descent rate had not been checked prior to beginning the flare, the instructor joined the flying pilot on the controls. The helicopter landed hard on the runway and bounced, rotated to the left of runway heading as it touched down a second time, resulting in the collapse of the right landing skid. The pilot reported that were no mechanical anomalies with the flight control systems.
Probable Cause: The pilot under instruction's inadequate autorotation technique and the instructor pilot's delayed remedial action to arrest the rate of descent of the helicopter while in an autorotation flare.
Accident investigation:
 |
|
Sources:
NTSB WPR09TA277
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Oct-2022 18:23 | ASN Update Bot | Added |
| 01-Jun-2023 11:22 | Ron Averes | Updated |
Corrections or additions? ... Edit this accident description
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