20100423032969A

Accident · Substantial damage

FAA accident report · Grumman ACF G-164A · Madera, CA · April 23, 2010

Date
April 23, 2010 · 13:30 local
Place
Madera, CA
Phase of flight
Cruise/Level Flight
Operating rules
General operating rules (Part 91)
Damage
Substantial damage
Aircraft
N4450
NTSB investigation
NTSBWPR10LA214
Reported as
Grumman ACF G-164A
Reported engine
Pratt & Whitney P&W PT6A
People aboard
1
Fatal injuries
0
Other injuries
0
Pilot’s certificate
Commercial pilot
Pilot’s flight hours
10,000 total500 in this make and model40 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.

The aircraft was being ferried under FAR part 91 when apparently lost engine power while at 1500 feet AGL at cruise altitude. An emergency landing was initiated and landed in a pistachio orchard causing substantial damage to the aircraft's wing spars, propeller and engine components. There appears to have been a loss of oil pressure by the evidence of oil found around the engine compartment. The propellers sustained damaged to two of the three propellers and all propellers were found in a "feathered" position. This condition indicates a loss of oil pressure. The engine was inspected internally by a representative of pratt & whitney and found no obvious reasons for the loss of engine power or oil pressure. One ignitor had evidence of a sooty oil build-up. The fuel selector valve appeared to have difficulty in moving the from off to on.

As the FAA filed it

THE AIRCRAFT WAS BEING FERRIED UNDER FAR PART 91 WHEN APPARENTLY LOST ENGINE POWER WHILE AT 1500 FEET AGL AT CRUISE ALTITUDE. AN EMERGENCY LANDING WAS INITIATED AND LANDED IN A PISTACHIO ORCHARD CAUSING SUBSTANTIAL DAMAGE TO THE AIRCRAFT'S WING SPARS, PROPELLER AND ENGINE COMPONENTS. THERE APPEARS TO HAVE BEEN A LOSS OF OIL PRESSURE BY THE EVIDENCE OF OIL FOUND AROUND THE ENGINE COMPARTMENT. THE PROPELLERS SUSTAINED DAMAGED TO TWO OF THE THREE PROPELLERS AND ALL PROPELLERS WERE FOUND IN A "FEATHERED" POSITION. THIS CONDITION INDICATES A LOSS OF OIL PRESSURE. THE ENGINE WAS INSPECTED INTERNALLY BY A REPRESENTATIVE OF PRATT & WHITNEY AND FOUND NO OBVIOUS REASONS FOR THE LOSS OF ENGINE POWER OR OIL PRESSURE. ONE IGNITOR HAD EVIDENCE OF A SOOTY OIL BUILD-UP. THE FUEL SELECTOR VALVE APPEARED TO HAVE DIFFICULTY IN MOVING THE FROM OFF TO ON.

NTSB investigation

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