ASN Wikibase Occurrence # 293597
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| Date: | Friday 17 June 2005 |
| Time: | 15:30 LT |
| Type: |  MBB Bo 105S |
| Owner/operator: | Metro Aviation, Inc. |
| Registration: | N314MS |
| MSN: | S772 |
| Year of manufacture: | 1986 |
| Engine model: | Allison 250-C-20B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Billings, Montana -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Billings-Logan International Airport, MT (BIL/KBIL) |
| Billings-Logan International Airport, MT (BIL/KBIL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The instructor pilot had just finished giving the other pilot a proficiency check, and had then taken control of the aircraft so that he could perform some maneuvers for his own proficiency. He performed one simulated engine-out autorotation to a touchdown, and was completing his second, when the accident occurred. He initiated the autorotation from about 1,000 feet above the ground (agl), and began establishing a flare attitude at an altitude of 100 feet agl. At that time he noticed that the descent rate of the helicopter was excessive, but instead of adding power along with the increase in collective, he decided to continue the simulation of the power loss. Just prior to touchdown, the pilot established a landing attitude and used all of the available collective to cushion the landing. When the helicopter touched down, the descent rate was still greater than the pilot desired, and immediately after contacting the ground, the main rotor flexed downward and contacted the top of the tail boom. The pilot reported that there were no problems with the aircraft's flight controls or engine, but the variable wind had changed directions during the descent from 1,000 feet agl, and the aircraft was therefore landing with a tailwind. In addition, the pilot states that the density altitude was approximately 5,700 feet, which left little room for error. In his discussion with the NTSB, the pilot stated that under the conditions, he should have initiated a go-around when he sensed the excessive descent rate at 100 feet agl.
Probable Cause: The pilot's improper in-flight decision to continue a simulated engine-out autorotation after sensing an excessive descent rate at 100 feet above the ground. Factors include the excessive descent rate, variable winds, and a high density altitude.
Accident investigation:
 |
|
Sources:
NTSB SEA05LA120
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Oct-2022 08:06 | ASN Update Bot | Added |
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