ASN Wikibase Occurrence # 157632
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can
submit corrected information.
Date: | Tuesday 16 July 2013 |
Time: | 09:55 |
Type: | Bell UH-1H Iroquois |
Owner/operator: | Billings Flying Service |
Registration: | N775AR |
MSN: | 65-10067 |
Year of manufacture: | 1977 |
Total airframe hrs: | 14798 hours |
Engine model: | Lycoming T53-L-13B |
Fatalities: | Fatalities: 1 / Occupants: 1 |
Aircraft damage: | Substantial |
Category: | Accident |
Location: | Near Dove Creek, Colorado -
United States of America
|
Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
Nature: | Cargo |
Departure airport: | Dove Creek, CO |
Destination airport: | Dove Creek, CO |
Investigating agency: | NTSB |
Confidence Rating: | Accident investigation report completed and information captured |
Narrative:The helicopter pilot flew inbound to a seismic survey location hoisting a basket load with a long-line rope. The pilot overshot the intended drop site, and the basket load and long-line impacted the ground after the pilot likely initiated a load release. The helicopter then entered a right bank, followed by a steep left bank, and subsequently impacted the ground.
Postaccident examination of the helicopter revealed evidence consistent with a loss of hydraulic fluid from the flight control system due to a hydraulic leak of a check valve fitting near the tail rotor servo. As the pilot approached the survey location, the loss of hydraulic pressure most likely resulted in very-high collective control forces and pilot-induced oscillations. The director of maintenance stated that the pilot and a mechanic were aware of the hydraulic fluid leak and had ordered replacement parts; however, they had not yet been installed. He stated that they did not expect the leak to cause a significant issue. Thus, it is likely that they did not foresee the leak causing a significant flight hazard.
Probable Cause: Pilot-induced oscillations caused by the loss of hydraulic assist of the flight controls due to an excessive loss of hydraulic fluid during a critical phase of flight, which resulted in ground impact. Contributing to the accident was an inadequate analysis of the hydraulic fluid leak by the pilot and mechanic.
Accident investigation:
|
| |
Investigating agency: | NTSB |
Report number: | CEN13FA415 |
Status: | Investigation completed |
Duration: | |
Download report: | Final report |
|
Sources:
NTSB
FAA register:
http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=775AR Location
Revision history:
Date/time | Contributor | Updates |
17-Jul-2013 05:21 |
slowkid |
Added |
17-Jul-2013 16:02 |
Geno |
Updated [Time, Aircraft type, Registration, Cn, Source, Damage] |
21-Dec-2016 19:28 |
ASN Update Bot |
Updated [Time, Damage, Category, Investigating agency] |
29-Nov-2017 08:51 |
ASN Update Bot |
Updated [Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
The Aviation Safety Network is an exclusive service provided by:
CONNECT WITH US:
©2024 Flight Safety Foundation