FTW88FA036

NTSB accident investigation · Bell 412 · Galveston, TX · December 7, 1987

Accident · Serious injuriesField investigationFinal report
Date
December 7, 1987, 13:45 local (19:45 UTC)
Place
Galveston, TX
Injuries
2 serious
Damage
Destroyed
Phase of flight
Approach
Aircraft
N3910UBell 412
Weather
Visual (VMC) · Day
Status
Completed · report July 3, 1989
Report
Approved by Office Director
FAA report
19871207083299A
Case key
22530

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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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/malfunctionApproach - vfr pattern - final approach
Rotor drive system,tail rotor gearbox(90 deg) - separationCause
Rotor drive system,tail rotor gearbox(90 deg) - vibrationCause
Rotor drive system,tail rotor gearbox(90 deg) - undeterminedCause
Loss of control - in flightDescent - uncontrolled
Forced landingDescent - emergency
DitchingLanding - flare/touchdown
Terrain condition - waterFactor

Analysis

The acft landed hard in the gulf of Mexico during an autorotation that was entered following the separation of the 90 degree gearbox. The gearbox (with tail rotor blades) separated due to an imbalance. However, the gearbox was not recovered during the investigation and the cause of the imbalance could not be determined.

Aircraft

Registration
N3910U
Reported as
Bell 412
Category
Helicopter
Serial number
33018
Airframe hours
3,787
Engine
P&W PT-6T-3B, 1,350 horsepower, turbo shaft
Damage
Destroyed
Flight
Other work use · Part 91
Registered owner
Air Logistics
Airworthiness certificate
Standard, Transport
Last inspection
Continuous airworthiness · October 16, 1987 · 64 hours before
Departed
GLS
Destination
GLS
Airport
GLS · Scholes Fld, runway 31, 6,000 × 75 ft, asphalt

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
Certificates
Flight instructor, Airline transport
Instrument ratings
Helicopter
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Right
Flight hours
4,806 total · 88 in this make and model · 76 in the last 90 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
350° at 17 knots
Visibility
7 statute miles
Lowest ceiling
1,500 ft overcast
Temperature
63 °F, dew point 54 °F
Altimeter
29.00 inHg
Observed at
GLS, 2 nm away

FAA reports on this event · 1

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