NTSB Identification: LAX82FUQ09
14 CFR Part 91: General Aviation
Accident occurred Friday, January 22, 1982 in LANCASTER, CA
Probable Cause Approval Date: 01/22/1983
Aircraft: SONS MUSTANG II, registration: N13JL
Injuries: 2 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE PURPOSE OF THE FLIGHT WAS TO DEMONSTRATE THE AIRCRAFT TO A PROSPECTIVE BUYER. ABOUT 20 TO 30 MINUTES AFTER TAKEOFF, WITNESSES OBSERVED THE AIRCRAFT IN A CIRCLING DESCENT. AT 500 TO 700 FT AGL, THE DESCENT ANGLE SUDDENLY INCREASED TO NEARLY VERTICAL AND THE PLANE CRASHED. ONE WITNESS NOTED A CONSPICUOUS ABSENCE OF ENGINE NOISE. AN INVESTIGATION REVEALED THAT THE SHAFT ON THE FUEL SELECTOR VALVE WAS BROKEN BETWEEN THE SELECTOR HANDLE AND THE INTERNAL MECHANISM OF THE VALUE. THERE WAS EVIDENCE THAT THE SHAFT HAD BEEN PARTIALLY BROKEN FOR SOME TIME PRIOR TO THE ACCIDENT. TRACES OF FUEL WERE EVIDENT AT THE LEFT AND RIGHT INLET PORTS TO THE VALVE. HOWEVER, NO FUEL WAS EVIDENT IN THE FUEL SYSTEM, FORWARD FROM THE FUEL SELECTOR. A TEARDOWN DISCLOSED THAT THE FUEL SELECTOR VALVE WAS IN THE OFF POSITION.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FUEL SYSTEM,SELECTOR/VALVE..UNDETERMINED

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FLUID,FUEL..STARVATION

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

AIRSPEED..NOT MAINTAINED..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

STALL..INADVERTENT..PILOT IN COMMAND

Index for Jan1982 | Index of months