- Date
- May 16, 2001, 19:39 local (May 17, 2001, 00:39 UTC)
- Place
- Tulsa, OK
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N25157Kirchner Pietenpol Aircamper
- Weather
- Visual (VMC) · Day
- Status
- Completed · report February 5, 2002
- Report
- Approved by Office Director
- Parties
- OKC FSDO
- FAA report
- 20010516009149A
- Case key
- 52282
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
the pilot's inadequate flare during the forced landing, which resulted in a hard landing. A contributing factor was the engine overheating due a stuck oil cooler thermostat valve, which resulted in a loss of power.
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.
Analysis
During cruise flight in the homebuilt airplane, the pilot observed a rise in engine oil temperature. He elected to make a precautionary landing at a nearby airport; however, engine rpm decreased to where altitude could not be maintained. The pilot initiated a forced landing to a bean field about one mile northeast of the airport. During the landing, the airplane touched down hard, nosed over, and came to rest inverted. An examination of the Corvair automotive engine, by the owner, revealed a stuck oil cooler thermostat valve. The stuck valve was preventing oil from flowing through the oil cooler.
Factual narrative
On May 16, 2001, at 1939 central daylight time, a Kirchner Pietenpol Aircamper home built airplane, N25157, was substantially damaged during a forced landing following a loss of engine power near Tulsa, Oklahoma. The airplane was owned and operated by the pilot. The private pilot, sole occupant, was not injured. Visual meteorological conditions prevailed, and a flight plan was not filed for the 14 Code of Federal Regulations Part 91 personal flight. The flight originated from the Sand Ridge Airport near Collinsville, Oklahoma, at 1910, and was destined for the Richard Lloyd Jones Jr. Airport, Tulsa, Oklahoma.
While en route, the pilot observed a rise in engine oil temperature. The pilot elected to make a precautionary landing at the Harvey Young Airport; however, engine rpm decreased to where altitude could not be maintained. The pilot initiated a forced landing to a bean field about one mile northeast of the airport. During the landing, the airplane touched down "hard," nosed over, and came to rest inverted.
Examination of the airplane by FAA inspectors, who responded to the accident site, revealed that the main landing gear had collapsed and was partially separated. The right wing spar outboard of the lift strut was fractured, and the vertical stabilizer was damaged.
An examination of the Corvair automotive engine, by the owner, revealed a stuck oil cooler thermostat valve. The thermostat valve was found stuck in the position that would prevent oil from flowing through the oil cooler. Additionally, pieces of a broken piston ring were found in the engine's oil sump.
Attempts to obtain a completed Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1/2, from the pilot/owner were unsuccessful.
Aircraft
- Registration
- N25157
- Reported as
- Kirchner Pietenpol Aircamper
- Category
- Airplane, amateur-built
- Serial number
- 113EHK
- Engine
- Corvair, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Registered owner
- Earl D. Pittinger Jr.
- Airworthiness certificate
- Special, Experimental (Special)
- Departed
- OK94 · Collinsville, OK
- Destination
- RVS · Tulsa, OK
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
- 54
- Injuries
- None
- Certificate
- Private
- Airplane ratings
- Single-engine land
- Medical
- Class 3, Valid Medical--w/ waivers/lim
- Seat
- Rear
- Flight hours
- 1,000 total
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 190° at 14 knots
- Visibility
- 10 statute miles
- Lowest ceiling
- None
- Temperature
- 82 °F, dew point 72 °F
- Altimeter
- 29.68 inHg
- Observed at
- TUL, 5 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.
Other investigations on N25157 · 1
Matched to the same aircraft by N-number and date.