Aviation Crash Map

Hiller UH-12D N94496

31 March 1990 · Soddy-Daisy, Tennessee, United States · Fatal

Summary

On 31 March 1990 at about 18:38 local time, a Hiller UH-12D registered N94496 was involved in an accident near Soddy-Daisy, Tennessee, United States. 3 people were on board and one died, one was seriously injured, one had minor injuries. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

The record

Date
at 18:38
Classification
Accident
Location
Soddy-Daisy, Tennessee, United States
Coordinates
35.2607, -85.1694
Aircraft
Hiller UH-12D
Registration
N94496
Category
Helicopter
Engines
1
Operator
Not recorded
Operating rule
Part 91: General Aviation
Purpose of flight
Personal
Phase of flight
Not recorded
Route
Hixson → Unknown
Aircraft damage
Substantial
Weather
VMC
Light
Day
NTSB number
ATL90FA089

People

1 person died.

On board Died Serious Minor Uninjured
3 1 1 1 0

Probable cause

FATIGUE INDUCED FAILURE OF THE COLLECTIVE PITCH PUSH ROD (ADJUSTABLE) DURING FLIGHT, AND THE FAILURE OF THE PILOT TO PROVIDE ROUTINE MAINTENANCE. THE PILOT'S LACK OF EXPEREINCE AND HIS FAILURE TO OBTAIN REQUIRED TRAINING AND CERTIFICATION WERE FACTORS IN THE ACCIDENT.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

SHORTLY AFTER TAKEOFF, THE PILOT OBSERVED DECREASING ENGINE AND ROTOR RPM. HE LOWERED THE COLLECTIVE, BUT THE RPM DID NOT RETURN. THE HELICOPTER COLLIDED WITH TREES AND TERRAIN DURING THE FORCED LANDING ATTEMPT. AN INSPECTION OF THE HELICOPTER REVEALED THAT THE COLLECTIVE PITCH PUSH ROD (ADJUSTABLE) HAD FAILED IN FATIGUE. THE LAST RECORDED MAINTENANCE WAS PERFORMED ON FEBRUARY 22, 1988, MORE THAN TWO YEARS PRIOR TO THE ACCIDENT. THE PILOT/OWNER WAS OPERATING THE HELICOPTER WITH A STUDENT PILOT CERTIFICATE AND WAS CARRYING PASSENGERS.

Quoted verbatim from the NTSB record.

Other Hiller UH-12D accidents

Date Aircraft Location Operator Outcome Died
4 Jul 1990 Hiller UH-12D
N62431
Walla Walla, Washington, United States - No injuries -
2 Jul 1991 Hiller UH-12D
N94515
Savoy, Illinois, United States Board of Trustees-U. of I. No injuries -
23 Oct 1989 Hiller UH-12D
N63LC
Mentor, Ohio, United States - Serious injuries -
14 Apr 1989 Hiller UH-12D
N14490
Bolinas, California, United States Mountain Air Helicopter No injuries -
9 Jul 1988 Hiller UH-12D
N646JS
Winterhaven, California, United States
no coordinates
- Minor injuries -
4 Apr 1988 Hiller UH-12D
N646JS
Bakersfield, California, United States West Farm Air Inc. No injuries -

All 33 records for this type

Other accidents in this area

Date Aircraft Location Operator Outcome Died
21 Oct 1990 Olsen-Gordon VERI EZE
N9327A
Hohenwald, Tennessee, United States Creel, Rodney J. Fatal 1
1 Nov 1990 Bell 47J-2
N49DA
Gatlinburg, Tennessee, United States Pigeon Forge Helicopters, Inc. Serious injuries -
8 Dec 1990 Cessna 150J
N51160
Ripley, Tennessee, United States Shelby Aviation, Inc. Fatal 1
3 Nov 1990 Bell 412
N412UT
Knoxville, Tennessee, United States - No injuries -
10 Nov 1990 Saab-Scania Ab (Saab) 340A
N322PX
Memphis, Tennessee, United States Heleasco Twenty Four, Inc. No injuries -
17 Oct 1990 E Tn Plts Starduster STARDUSTER II
N19SR
Knoxville, Tennessee, United States - Serious injuries -

All 170,864 records in United States