LAX93LA058

NTSB accident investigation · Robinson R-22 Beta · Fresno, CA · December 3, 1992

Accident · No injuriesLimited investigationFinal report
Date
December 2, 1992, 17:09 local (Dec 3, 1992, 01:09 UTC)
Place
Fresno, CA
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N80142Robinson R-22 Beta
Weather
Visual (VMC) · Night/dark
Status
Completed · report September 14, 1993
Report
Approved by Office Director
FAA report
19921202048709A
Case key
27877

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The pilot's inadequate preflight. Contributing to this accident was the separation of the fuel cap, tail rotor blade balance weight, tail rotor gear box, and the vertical fin.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Airframe/component/system failure/malfunctionCruise
Fuel system,cap - separationFactor
Aircraft preflight - inadequatePilot in commandCause
Rotor system,tail rotor blade balance weights - separationFactor
Rotor system,tail rotor blade balance weights - overload
Rotor drive system,tail rotor gearbox(90 deg) - separationFactor
Rotor drive system,tail rotor gearbox(90 deg) - overload
Vertical stabilizer attachment - separationFactor
Vertical stabilizer attachment - overload
Forced landingDescent - emergency
Hard landingDescent - emergency
Terrain condition - none suitable

Analysis

The helicopter tail rotor gear box and the vertical fin separated during cruise flight. The pilot was able to land the helicopter in a flood basin. The wreckage examination disclosed that the fuel cap came off the fuel tank and struck a tail rotor blade. The tail rotor blade balance weight separated as did the entire vertical fin. The tail rotor assembly remained attached to the helicopter by its pitch change connecting rod. Metallurgical examination of the separated parts disclosed no evidence of any preexisting cracking or fatigue. The porosity level of the vertical fin bulkhead casting was within normal limits.

Aircraft

Registration
N80142
Reported as
Robinson R-22 Beta
Category
Helicopter
Serial number
0992
Airframe hours
2,167
Engine
Lycoming O-320-B2C, 160 horsepower, reciprocating
Damage
Substantial damage
Flight
Aerial observation · Part 91
Operator
Henry Broadcasting Co.
Registered owner
Henry Broadcasting Co.
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · November 9, 1992

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
36
Certificate
Commercial
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--no waivers/lim.
Seat
Right
Flight hours
5,130 total · 2,667 in this make and model · 156 in the last 90 days · 52 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Night/dark
Visibility
10 statute miles
Lowest ceiling
7,000 ft overcast
Temperature
50 °F

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.