ASN Wikibase Occurrence # 140327
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| Date: | Wednesday 7 December 2011 |
| Time: | 08:30 |
| Type: |  Robinson R22 Beta |
| Owner/operator: | Mauna Loa Helicopters |
| Registration: | N817AB |
| MSN: | 1258 |
| Year of manufacture: | 1990 |
| Total airframe hrs: | 6810 hours |
| Engine model: | Lycoming Engines O-320-B2C |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Location: | Near Kunia, Waipahu, Oahu, HI -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Honolulu-Daniel K. Inouye International Airport, HI (HNL/PHNL) |
| Honolulu-Daniel K. Inouye International Airport, HI (HNL/PHNL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The certified flight instructor (CFI) and a student pilot, who held a foreign-issued fixed-wing certificate, were on a local training flight to practice auto rotations. The CFI demonstrated the first auto rotation. Prior to letting the student take the controls, she reviewed the recovery procedure again. The CFI remained on the controls while the student made the control applications. One auto rotation was performed successfully. The student entered his second auto rotation, and, at 1,000 feet above ground level, the CFI requested that the student perform a recovery.
Rather than cracking the throttle as demonstrated, the student rolled on the throttle, and the CFI felt a yaw to the right. The CFI took control of the helicopter and countered the yaw with left pedal. The CFI noted that the engine rpm and rotor rpm were excessively high, so she decreased the throttle to lower the engine rpm. She began to raise the collective to lower the rotor rpm, but neither of the rpm needles decreased. The helicopter was maintaining a level attitude, but it was descending. During the landing, the low rotor rpm horn sounded, the helicopter touched down hard, and the tail boom separated. The CFI reported no pre impact mechanical malfunctions or failures with the helicopter that would have precluded normal operation.
Probable Cause: The certified flight instructor's delayed remedial action and inadequate supervision during a practice autorotation. Contributing to the accident was the student pilot's excessive application of the throttle.
Accident investigation:
 |
|
Sources:
1. NTSB Identification: WPR12CA056 at https://www.ntsb.gov/news/press-releases/_layouts/ntsb.aviation/brief.aspx?ev_id=20111207X35846&key=1
2. FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?nNumberTxt=817AB
3. http://helihub.com/2011/12/07/07-dec-11-n817ab-robinson-r22-honolulu-us-hawaii/
4. http://helicoptersafety.blogspot.com/2011/12/07-dec-11-n817ab-robinson-r22-honolulu.html
5. http://www.kathrynsreport.com/2011/12/waipahu-hawaii-emergency-landing.html
History of this aircraft
Other occurrences involving this aircraft
| 22 September 2005 | N82001 | Hawaii Pacific Aviation | 0 | Kamuela, Hawaii, HI | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Dec-2011 01:59 | Alpine Flight | Added |
| 10-Dec-2011 04:54 | RobertMB | Updated [Time, Aircraft type, Registration, Cn, Operator, Total occupants, Source, Narrative] |
| 21-Dec-2011 11:21 | Geno | Updated [Location, Departure airport, Destination airport, Source, Narrative] |
| 10-Oct-2016 09:58 | Dr.John Smith | Updated [Location, Departure airport, Destination airport, Source, Narrative] |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Nov-2017 17:38 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
| 07-Sep-2018 01:55 | Dr.John Smith | Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative] |
| 11-Jun-2023 21:30 | Ron Averes | Updated [[Other fatalities, Departure airport, Destination airport, Source, Narrative]] |
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