20120827019329A

Accident · Substantial damage

FAA accident report · Waco UPF-7 · Jim Falls, WI · August 27, 2012

Date
August 27, 2012 · 13:45 local
Place
Jim Falls, WI
Phase of flight
Cruise/Level Flight
Operating rules
General operating rules (Part 91)
Damage
Substantial damage
Aircraft
N32011
NTSB investigation
NTSBCEN12LA582
Reported as
Waco UPF-7
Reported engine
Continental W670 series
People aboard
1
Fatal injuries
0
Other injuries
0
Pilot’s certificate
Private pilot
Pilot’s flight hours
1,900 total25 in this make and model12 in the last 90 days

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

Aircraft was topped off with fuel the night prior to flight. Preflight noted blue dye from fuel overflow on right wing below fuel vent. Aircraft engine quit after 1.5 hours of criuse flight. Pilot was able to restart engine with carb heat on and it ran for another 10-15 seconds before quiting a second time. Pilot verified fuel selector was in both position. Second attempt to restart engine by forward and aft stick movement, resulted in short burst of engine power before finally quitting. Attempted to land in a farm field but left main gear hit gate post, tearing LH gear from aircraft. Aircraft skidded along until it tipped up on it's nose, coming to a stop with tail nearly vertical. Immediately after the accident, no fuel was observed coming out of the aircraft wings. About 45 minutes later fuel was observed coming out of the right wing vent tube. When aircraft was set back down in a level attitude, the aircraft technician estimated there was between 15 and 20 gallons of fuel in the right wing, none in the left. Details provided by pilot, witnesses and the aircraft technician inspection findings of this event, suggests that the right wing fuel tank vent had very likely had an obstruction which would not allow the proper fuel flow. Supporting this possible conclusion is the blue dye stain that was on the right wing at preflight. The dye is known to leave residue. Once the aircraft was nose down and fuel and fuel weight on the vent tube could have likely disolved and obstruction, allowing fuel to once again flow as witnessed 45 minutes after the accident.

As the FAA filed it

AIRCRAFT WAS TOPPED OFF WITH FUEL THE NIGHT PRIOR TO FLIGHT. PREFLIGHT NOTED BLUE DYE FROM FUEL OVERFLOW ON RIGHT WING BELOW FUEL VENT. AIRCRAFT ENGINE QUIT AFTER 1.5 HOURS OF CRIUSE FLIGHT. PILOT WAS ABLE TO RESTART ENGINE WITH CARB HEAT ON AND IT RAN FOR ANOTHER 10-15 SECONDS BEFORE QUITING A SECOND TIME. PILOT VERIFIED FUEL SELECTOR WAS IN BOTH POSITION. SECOND ATTEMPT TO RESTART ENGINE BY FORWARD AND AFT STICK MOVEMENT, RESULTED IN SHORT BURST OF ENGINE POWER BEFORE FINALLY QUITTING. ATTEMPTED TO LAND IN A FARM FIELD BUT LEFT MAIN GEAR HIT GATE POST, TEARING LH GEAR FROM AIRCRAFT. AIRCRAFT SKIDDED ALONG UNTIL IT TIPPED UP ON IT'S NOSE, COMING TO A STOP WITH TAIL NEARLY VERTICAL. IMMEDIATELY AFTER THE ACCIDENT, NO FUEL WAS OBSERVED COMING OUT OF THE AIRCRAFT WINGS. ABOUT 45 MINUTES LATER FUEL WAS OBSERVED COMING OUT OF THE RIGHT WING VENT TUBE. WHEN AIRCRAFT WAS SET BACK DOWN IN A LEVEL ATTITUDE, THE AIRCRAFT TECHNICIAN ESTIMATED THERE WAS BETWEEN 15 AND 20 GALLONS OF FUEL IN THE RIGHT WING, NONE IN THE LEFT.DETAILS PROVIDED BY PILOT, WITNESSES AND THE AIRCRAFT TECHNICIAN INSPECTION FINDINGS OF THIS EVENT, SUGGESTS THAT THE RIGHT WING FUEL TANK VENT HAD VERY LIKELY HAD AN OBSTRUCTION WHICH WOULD NOT ALLOW THE PROPER FUEL FLOW. SUPPORTING THIS POSSIBLE CONCLUSION IS THE BLUE DYE STAIN THAT WAS ON THE RIGHT WING AT PREFLIGHT. THE DYE IS KNOWN TO LEAVE RESIDUE. ONCE THE AIRCRAFT WAS NOSE DOWN AND FUEL AND FUEL WEIGHT ON THE VENT TUBE COULD HAVE LIKELY DISOLVED AND OBSTRUCTION, ALLOWING FUEL TO ONCE AGAIN FLOW AS WITNESSED 45 MINUTES AFTER THE ACCIDENT.

NTSB investigation

The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.