INTERREX ADVENTURES INC: http://registry.faa.gov/N202CH
NTSB Identification: ERA16LA167
14 CFR Part 91: General Aviation
Accident occurred Wednesday, April 20, 2016 in Myerstown, PA
Aircraft: BELL 47D1, registration: N202CH
Injuries: 2 Uninjured.
This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
On April 20, 2016, about 1130 eastern daylight time, a Bell 47D1 helicopter, N202CH, was substantially damaged during practice autorotation landings at Deck Airport (9D4), Myerstown, Pennsylvania. The certified flight instructor and airline transport rated pilot were not injured. The helicopter was registered to and operated by a private company. Visual meteorological conditions prevailed and no flight plan was filed for the local flight conducted as a 14 Code of Federal Regulations Part 91 instructional flight.
The flight instructor, who was seated in the right seat, was performing a flight review for the pilot. She stated that she was demonstrating an autorotation that would terminate with power. The instructor entered the maneuver about 1,500 feet above ground level (agl) by reducing throttle to idle and lowering the collective to the full down position. She stabilized the approach at 45 miles per hour (mph), but noted the engine's idle speed was about 100 rpm higher than normal. The instructor said she was not satisfied with the needle split between the engine and rotor rpm so she advanced the throttle to the full open position. However, when she did this, there was no response from the engine. The instructor entered a flare about 50 ft agl and the helicopter impacted the ground with little to no forward speed, bounced and rolled over to the left.
The pilot stated he was receiving a flight review and was monitoring the instructor's demonstration of an autorotation that would terminate with power. They entered the maneuver about 1200 ft agl and all appeared normal. The pilot was scanning the engine rpm, rotor rpm, and "ball" throughout the demonstration. When the helicopter reached an altitude of 50 ft agl, he noticed the rotor and engine speed needles were still split so he reached over and confirmed that the throttle was indeed full open.
A postaccident examination of the helicopter was conducted by the Federal Aviation Administration (FAA). According to an inspector, no mechanical anomalies were noted when the throttle was moved from the idle to the full-open position.