ATL88LA232

NTSB accident investigation · Hiller UH-12A · Paducah, KY · August 20, 1988

Accident · Serious injuriesLimited investigationFinal report
Date
August 20, 1988, 16:40 local (21:40 UTC)
Place
Paducah, KY
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N4828EHiller UH-12A
Weather
Visual (VMC) · Day
Status
Completed · report January 4, 1990
Report
Approved by Office Director
FAA report
19880820034309A
Case key
7799

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.

Loss of engine power(total) - mech failure/malfClimb - to cruise
Accessory drive assy,drive gear - disconnectedCause
Ignition system,magneto - failure,totalCause
Maintenance,overhaul - improperOther maintenance personnelCause
Forced landingDescent - emergency
Autorotation - performed
In flight collision with terrain/waterLanding - flare/touchdown
Object - tree(s)
Roll overLanding - flare/touchdown

Analysis

After departure the eng quit & PIC made an autorotative landing in a wooded area. Initial exam of eng revealed water in the carb float bowl. Investigation showed helo had 100 hr inspection recorded in the log, but may have been returned to service by mechanic without inspection authorization as an annual inspection. Helo records were obtained by one of the mechanics from the same repair station, but not given to FAA inspector & later lost. Later exam of the eng showed holes in accessory case. Partial teardown showed that the left mag drive coupling nut cotter key was missing. It is believed the cotter key was not installed or was damaged during installation & backed out of the nut allowing the nut to back off & the drive coupling to disconnect. The plt did not file an acc report. The plts log books have not been located. The acft rolled over after lndg.

Aircraft

Registration
N4828E
Reported as
Hiller UH-12A
Category
Helicopter
Serial number
285
Engine
Franklin 6V-335-B, 210 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
James F.Allen
Registered owner
Cross, Doug A.
Airworthiness certificate
Standard, Normal
Last inspection
Unknown · August 19, 1989
Departed
KY29
Destination
New Burnside, IL
Airport
KY29 · Farrington Airpark, runway 4, 2,985 × 60 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
37
Certificate
Student
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Center
Flight hours
344 total

Weather

Conditions
Visual (VMC) · Day
Wind
100° at 4 knots
Visibility
6 statute miles
Lowest ceiling
None
Temperature
88 °F, dew point 72 °F
Altimeter
29.00 inHg
Observed at
PAH, 10 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.