NTSB CAROL · Event
Event FTW96LA121
Registry · N67065
FAA Aircraft Registry record.
Make / Model
HILLER-OSBORN UH-12D
Year of manufacture
1957 · 39 years old at event
Engine
LYCOMING VO-435 SERIES (260 hp)
Seats / Engines
3 seats · 1 engine
Last airworthiness date
19760315
ADS-B equipped
Yes — Mode-S A8DF00
Registrant of record
FORT WOLTERS HELICOPTER INC
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
a loss of engine power for undetermined reasons, and the pilot's improper touchdown.
Factual narrative
On February 16, 1996, at 1015 central standard time, a Hiller UH-12D helicopter, N67065, registered to, and operated by T.M. Davis Construction Inc., as a Title 14 CFR Part 91 aerial observation flight, was substantially damaged following a loss of control while maneuvering near Carrizo Springs, Texas. The private pilot and his passenger were not injured. Visual meteorological conditions prevailed for the personal flight for which a flight plan was not filed. The flight originated at the ranch office at approximately 0830. The pilot reported that the helicopter departed the Windship Ranch for a local flight to spot deer. "While cruising at about 50 feet and about 40 knots indicated airspeed and after making a 360 degree turn, the engine either lost power or for some other reason would not maintain adequate rotor RPM." The pilot further reported that he lowered the collective in an attempt to increase rotor RPM, "but, the RPM would not reach the minimum required to fly." Subsequently, he landed the helicopter hard, and "the main rotor blade struck the tailboom, severing the boom and 3 feet of blade." The helicopter came to rest on its side. Examination of the airframe and engine by the FAA inspector did not reveal any pre-mishap discrepancies. The reason for the loss of engine power and rotor RPM could not be determined. The helicopter departed the ranch's office on a local flight to spot deer. 'While cruising at about 50 feet and about 40 knots indicated airspeed and after making a 360 degree turn, the engine either lost power or for some other reason would not maintain adequate rotor RPM.' The pilot lowered the collective in an attempt to increase rotor RPM, 'but, the RPM would not reach the minimum required to fly.' Subsequently, he landed the helicopter hard, and 'the main rotor blade struck the tailboom, severing the boom and 3 feet of blade.' The helicopter came to rest on its side. Examination of the airframe and engine did not reveal any premishap discrepancies. The reason for the loss of engine and rotor RPM could not be determined. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1996_FTW96LA121.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
What the literature says.
Academic papers and agency reports matching this event's aircraft type or causal vocabulary (loss of control). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- Embry-Riddle Scholarly Commons 2025 · Journal article (JAAER)
A Scoping Review of Aviation Loss of Control Inflight Research
Loss of control – inflight (LOC-I) contributes to aircraft accidents at unacceptably high rates. Significant industry efforts and research have aimed to improve LOC-I prevention, detection, and recove…
- SKYbrary (Eurocontrol) 2024 · SKYbrary article
Loss of Control In-Flight (LOC-I) — SKYbrary Knowledge Base
SKYbrary comprehensive knowledge-base entry on Loss of Control In-Flight — definitions, contributing factors, accident case studies (Air France 447, Colgan 3407), and prevention strategies.
- NTSB Aircraft Accident Reports 2022 · Accident report
Loss of Control on Takeoff in Icing Conditions — Citation 560XL
Cessna Citation 560XL fatal takeoff icing accident, March 2018. Investigation of a Citation 560XL loss-of-control takeoff accident in icing conditions.
- Semantic Scholar 2021 · Article (Aviation)
ANALYSIS OF GENERAL AVIATION FIXED-WING AIRCRAFT ACCIDENTS INVOLVING INFLIGHT LOSS OF CONTROL USING A STATE-BASED APPROACH
Inflight loss of control (LOC-I) is a significant cause of General Aviation (GA) fixed-wing aircraft accidents. The United States National Transportation Safety Board’s database provides a rich source…
- NASA NTRS 2021 · Presentation
Use of Design of Experiments in Determining Neural Network Architectures for Loss of Control Detection
Abstract—We describe empirical methods for selecting a neural network architecture to implement belief state inference on generic commercial transport aircraft.
- NASA NTRS 2021 · Conference Paper
Use of Design of Experiments in Determining Neural Network Architectures for Loss of Control Detection
We describe empirical methods for selecting a neural network architecture to implement belief state inference on generic commercial transport aircraft.
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