NTSB CAROL · Event
Event ATL96LA023
Registry · N234SM
FAA Aircraft Registry record.
Make / Model
HILLER OH-23C
Year of manufacture
1955 · 40 years old at event
TCDS
6H2 · SIAM HILLER HOLDINGS INC
Engine
FRANKLIN 6V4 SERIES (210 hp)
Seats / Engines
4 seats · 1 engine
Last airworthiness date
19931112
ADS-B equipped
Yes — Mode-S A218F8
Registrant of record
ROBERTSON KENNETH W
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
The pilot's improper operation of the flight controls during a practice autorotation, and the certified flight instructor's inadequate supervision of the operation
Factual narrative
On December 18, 1995, at 1500 eastern standard time, a Hiller 12C, N234SM, touched down hard during a practice autorotation at the Grand Strand Airport in North Myrtle Beach, South Carolina. The instructional flight operated under the provisions of 14 CFR Part 91 with no flight plan filed. Visual weather conditions prevailed at the time of the accident. The helicopter sustained substantial damage; the certified flight instructor and the private pilot were not injured. The flight departed North Myrtle Beach, at 1430. The pilots were conducting pre-checkride flight training. According to the private pilot, they were executing a practice autorotation to a powered recovery. As the pilots maneuvered the helicopter during the flare, the tail rotor assembly struck the ground. No mechanical problems with the airplane were reported by the pilot. The private helicopter pilot and certified flight instructor were conducting pre-checkride flight training. While executing an autorotation to a power recovery, the tail rotor assembly collided with the ground and subsequently separated from the gearbox assembly. No mechanical problems with the helicopter were reported by the pilots. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1995_ATL96LA023.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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