Small transport in formation flight has engine failure. Forced landing off airport.

Attributes
ACN	184823
Time
Date	199107
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : jac
State Reference	WY
Altitude	msl bound lower : 6400 msl bound upper : 6400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Transport
Flight Phase	climbout : intermediate altitude descent other landing other
Flight Plan	VFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Transport
Flight Phase	climbout : intermediate altitude descent other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 50 flight time total : 20000 flight time type : 700
ASRS Report	184823
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other other : unspecified cockpit other other : unspecified
Resolutory Action	flight crew : declared emergency none taken : unable
Consequence	other
Supplementary
Primary Problem	Aircraft

Narrative:

During climb out on a 2 plane photo flight my wingman reported oil vapor coming from under the aircraft. Check of instruments showed loss of oil pressure and a chip detector light. Turned aircraft back toward field and shortly thereafter the engine failed. Landing was made on park service land approximately 1.2 mi north of jackson hole airport. There were no injuries or damage to property other than the aircraft. Landing was gear up in a sage brush covered area. Callback conversation with reporter revealed the following information: reporter states he has not torn down the engine yet, but feels there is massive internal failure which caused oil pump failure and engine shut down. Very expensive landing but no one injured. Reporter on unicom when he turned around and informed in the blind of situation. Wingman continued announcing situation when aircraft went down.

Original NASA ASRS Text

Title: SMT IN FORMATION FLT HAS ENG FAILURE. FORCED LNDG OFF ARPT.

Narrative: DURING CLBOUT ON A 2 PLANE PHOTO FLT MY WINGMAN RPTED OIL VAPOR COMING FROM UNDER THE ACFT. CHK OF INSTRUMENTS SHOWED LOSS OF OIL PRESSURE AND A CHIP DETECTOR LIGHT. TURNED ACFT BACK TOWARD FIELD AND SHORTLY THEREAFTER THE ENG FAILED. LNDG WAS MADE ON PARK SVC LAND APPROX 1.2 MI N OF JACKSON HOLE ARPT. THERE WERE NO INJURIES OR DAMAGE TO PROPERTY OTHER THAN THE ACFT. LNDG WAS GEAR UP IN A SAGE BRUSH COVERED AREA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES HE HAS NOT TORN DOWN THE ENG YET, BUT FEELS THERE IS MASSIVE INTERNAL FAILURE WHICH CAUSED OIL PUMP FAILURE AND ENG SHUT DOWN. VERY EXPENSIVE LNDG BUT NO ONE INJURED. RPTR ON UNICOM WHEN HE TURNED AROUND AND INFORMED IN THE BLIND OF SITUATION. WINGMAN CONTINUED ANNOUNCING SITUATION WHEN ACFT WENT DOWN.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.