ASN Wikibase Occurrence # 223267
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| Date: | Wednesday 20 March 2019 |
| Time: | 16:10 LT |
| Type: |  Robinson R22 Beta II |
| Owner/operator: | Rocking R Enterprises |
| Registration: | N7782H |
| MSN: | 3962 |
| Year of manufacture: | 2005 |
| Total airframe hrs: | 6459 hours |
| Engine model: | Lycoming O-360-J2A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Madill, OK -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Madill Airport, OK (1F4) |
| Ardmore Municipal Airport, OK (ADM/KADM) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that about 10 minutes after takeoff, the helicopter was in level flight about 700 to 800 ft above ground level when the clutch actuator warning/caution light illuminated. He entered an autorotation intending to do a power recovery close to the ground. He indicated that, within a "short second or two" after the clutch light illuminated, he heard a "bang" and felt the helicopter shudder. He continued the autorotation and landed on rough terrain. The helicopter rolled onto its left side and sustained substantial damage to the tail boom, main rotor, and fuselage.
The examination of the helicopter revealed that the two double V-belts had separated from the upper sheave and that there was a field repair on the wire connections at the clutch actuator fuse holder. The terminals were wrapped in tape and a wire tie. When the wire tie and tape were removed, the fuse holder terminal fell and fractured from the holder, and the wires separated from the solder on the terminal. The extension limiter was found at 1.65 inches, which is the maximum extension limit; the normal range was 1.1 to 1.3 inches.
The improper repair of the clutch actuator fuse holder likely caused the loose condition of the V-belts, which resulted in V-belt failure and the loss of power to the helicopter's rotor system, subsequent autorotation, and forced landing.
Probable Cause: The failure of the V-belts due to improper maintenance, which resulted in the loss of power to the helicopter's rotor system and subsequent forced landing on rough terrain.
Accident investigation:
 |
|
Sources:
FAA register: https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=7782H
NTSB CEN19LA106
Location
Media:
Pilot walks away after helicopter crashes in Marshall County, Oklahomahttps://t.co/1mxVkUektd pic.twitter.com/DVva4l8CpI
— KTEN News (@KTENnews) 21 mars 2019
A small helicopter crashes in a pasture in Marshall County Wednesday afternoon and the pilot walks away.
— KXII News 12 (@KXIITV) 21 mars 2019
Find out what witnesses said about the crash. https://t.co/ZN4aqDjaHz pic.twitter.com/Garr1eUQRX
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Mar-2019 19:28 | gerard57 | Added |
| 21-Mar-2019 19:53 | Geno | Updated [Aircraft type, Registration, Cn, Operator, Location, Phase, Departure airport, Destination airport, Source, Narrative] |
| 21-Mar-2019 20:02 | RobertMB | Updated [Aircraft type, Location, Source] |
| 21-Mar-2019 20:04 | Aerossurance | Updated [Aircraft type, Location, Phase, Damage, Narrative] |
| 21-Mar-2019 20:15 | RobertMB | Updated [Aircraft type] |
| 21-Mar-2019 21:29 | Captain Adam | Updated [Damage, Narrative] |
| 21-Mar-2019 23:21 | Iceman 29 | Updated [Embed code, Damage] |
| 29-Mar-2021 17:38 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Destination airport, Source, Embed code, Damage, Narrative, Category, Accident report] |
| 06-Mar-2022 23:27 | Captain Adam | Updated [Other fatalities, Location, Departure airport, Source, Embed code, Narrative, Category] |
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