Hiller 12E N90475
16 March 1986 · Poterville, California, United States · No injuries
Summary
On 16 March 1986 at about 18:02 local time, a Hiller 12E registered N90475, operated by Mark Shepard, was involved in an accident near Poterville, California, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. No probable cause statement is available for this record.
The record
- Date
- at 18:02
- Classification
- Accident
- Location
- Poterville, California, United States
- Coordinates
- 35.9606, -118.9200
- Aircraft
- Hiller 12E
- Registration
- N90475
- Category
- Helicopter
- Engines
- 1
- Operator
- Mark Shepard
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Positioning
- Phase of flight
- Not recorded
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- LAX86LA142
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 1 |
Probable cause
The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.
Nothing about the cause is stated here that is not in the source record.
Read the full NTSB narrative
A HILLER 12E HELICOPTER LANDED HARD AFTER AN ENG FAILURE. THE ACFT WAS ENROUTE TO ANOTHER FIELD SITE AT APRX 100 FT AGL AND 40 KTS IAS. THE ENG QUIT ABRUPTLY AND THE ROTOR RPM DECAYED 100 RPM. THE ACFT WAS ABOUT 2,000 POUNDS GWT AT THE TIME OF THE ACCIDENT AND THE AUTOROTATIONAL RPM WAS RIGGED FOR THE MAXIMUM GWT OF 3,100 POUNDS. THE ENG MAIN CASE WAS CRACKED IN THE VICINITY OF CYL #6. DURING THE ENG TEARDOWN #6 PISTON, CONNECTING ROD AND ONE RODCAP BOLT CAME OFF WITH THE CYL. ONE ROD BOLT WAS BROKEN AND THE NUT WAS STILL ATTACHED TO THE BROKEN END. THE OTHER ROD BOLT WAS UNBROKEN AND THE NUT WAS MISSING.
Quoted verbatim from the NTSB record.
Other Hiller 12 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 30 Mar 1986 | Hiller 12E | Walla Walla, Washington, United States | - | No injuries | - |
| 18 May 1986 | Hiller 12-C | Palmer, Alaska, United States | Laren Zager | No injuries | - |
| 29 Jun 1986 | Hiller 12C | Lehighton, Pennsylvania, United States | - | No injuries | - |
| 26 Apr 1985 | Hiller 12E | Myrtle Point, Oregon, United States | - | No injuries | - |
| 9 May 1985 | Hiller 12-C | Casa Grande, Arizona, United States | - | No injuries | - |
| 23 Jul 1987 | Hiller 12E | Ulysess, Kansas, United States | TRI Rotor Spray | Minor injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 29 Jun 1986 | Cessna 150 | Hesperia, California, United States | - | No injuries | - |
| 1 Nov 1986 | Luscombe 8A | Half Moon Bay, California, United States | - | No injuries | - |
| 28 Jun 1986 | Schleicher ASW-19 | Warner Springs, California, United States | Mark A. Miller | No injuries | - |
| 2 Nov 1986 | Learjet 24 | Lake Tahoe, California, United States | - | No injuries | - |
| 30 Jun 1986 | Piper PA-18-150 | Ukiah, California, United States | - | No injuries | - |
| 6 Nov 1986 | Beechcraft K35 | San Diego, California, United States | Dean Holt | Minor injuries | - |