Sunday, May 7, 2017

Hiller OH-23B Raven, N5776: Accident occurred December 10, 2016 in Tynan, Bee County, Texas

Aviation Accident Final Report - National Transportation Safety Board: https://app.ntsb.gov/pdf 

Investigation Docket - National Transportation Safety Board: https://dms.ntsb.gov/pubdms

Aviation Accident Data Summary - National Transportation Safety Board: https://app.ntsb.gov/pdf

The National Transportation Safety Board did not travel to the scene of this accident. 

Additional Participating Entity:

Federal Aviation Administration / Flight Standards District Office; San Antonio, Texas 

Tynan Flyers LLC: http://registry.faa.gov/N5776

NTSB Identification: CEN17LA055 
14 CFR Part 91: General Aviation
Accident occurred Saturday, December 10, 2016 in Tynan, TX
Probable Cause Approval Date: 05/01/2017
Aircraft: HILLER OH 23B, registration: N5776
Injuries: 1 Serious.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

The student pilot departed on his second solo flight in the helicopter. Before the accident, he completed two takeoffs and landings without incident. During a subsequent practice autorotation, the tail rotor struck the ground, the helicopter entered a spin, and it then came to rest near the place of initial impact. The student pilot reported that there were no mechanical or system malfunctions with the helicopter before the accident. The flight instructor who witnessed the accident stated that the deceleration/flare was executed too low. 

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
The student pilot's delayed and improper landing flare during a practice autorotation, which resulted in the tail rotor striking terrain.




On December 10, 2016, about 1130 central standard time, a Hiller OH-23B helicopter, N5776, impacted terrain during a practice autorotation near Tynan, Texas. The student pilot, who was the sole occupant, sustained serious injuries, and the helicopter was destroyed due to a post-impact fire. The helicopter was registered to Tynan Flyers, LLC, Tynan, Texas, and operated by a private individual as a 14 Code of Federal Regulations Part 91 instructional flight. Visual meteorological conditions prevailed at the time of the accident and a flight plan was not filed. The local flight departed a private residence about 1000.

The student pilot reported he departed a private residence on his second solo flight. Prior to the accident, he completed two takeoffs and landings without incident. During a practice autorotation, the tail rotor struck the ground, the helicopter entered a spin, and came to rest near the place of initial impact. The student pilot reported there were no mechanical or system malfunctions with the helicopter prior to the accident. 

According to the student pilot's flight instructor who witnessed the accident, the student pilot appeared to be conducting a practice autorotation with a power recovery. The instructor reported the deceleration/flare was executed too low and the tail rotor struck the ground. The helicopter then spun 180 degrees and rolled over onto its left side. A small fire was noted near the engine and the student pilot was pulled from the helicopter by another witness. The helicopter was destroyed by a post-impact fire. 

No comments: