NTSB Identification: FTW88DPJ07.
The docket is stored on NTSB microfiche number 36722.
Accident occurred Wednesday, June 29, 1988 in TULSA, OK
Probable Cause Approval Date: 07/10/1989
Aircraft: NORTHROP C-125A, registration: N3756Q
Injuries: 2 Minor.

THE PILOT DID NOT HOLD A TYPE RATING OR WRITTEN AUTHORIZATION TO ACT AS PILOT IN COMMAND. THE CO-PILOT DID NOT HOLD A TYPE RATING OR WRITTEN AUTHORIZATION TO ACT AS SECOND IN COMMAND AND HIS MEDICAL HAD EXPIRED. THE AIRCRAFT DID NOT HAVE AN AIRWORTHINESS CERTIFICATE NOR HAD A SPECIAL FLIGHT PERMIT BEEN ISSUED. THE LEFT PROPELLER WENT INTO REVERSE DURING THE INITIAL CLIMB DUE TO CORROSION AND DETERIORATION OF THE WIRING THAT CONTROLLED THE PROPELLER. THE ACFT CRASHED OUT OF CONTROL AFTER COLLIDING WITH POWER LINES DURING TAKEOFF. IT STRUCK THE GROUND AND WENT THRU A FENCE THEN DOWN A SLOPE AND OVER AN EMBANKMENT. THE ACFT THEN BOUNCED ACROSS A STREET WHILE TURNING AROUND AND COLLIDING WITH A POWER LINE POLE TAIL FIRST. THE ACFT HAD TRAVELED ABOUT 537 FT FROM INITIAL GROUND CONTACT. ALL 3 ENGINES WERE STILL PRODUCING POWER WHEN THE ACFT CAME TO REST.

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

ELECTRICAL SYSTEM..CORRODED

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

ELECTRICAL SYSTEM..DETERIORATED

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

PROPELLER SYSTEM/ACCESSORIES,REVERSING SYSTEM..ENGAGED

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

PROCEDURES/DIRECTIVES..DISREGARDED..PILOT IN COMMAND

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

OPERATION WITH KNOWN DEFICIENCIES IN EQUIPMENT..ATTEMPTED..PILOT IN COMMAND


Contributing Factors

INADEQ SUBSTANTIATION PROCESS,INADEQ DOCUMENTATION..COMPANY/OPERATOR MGMT


Contributing Factors

LACK OF TOTAL EXPERIENCE IN TYPE OF AIRCRAFT..PILOT IN COMMAND


Contributing Factors

LACK OF TOTAL EXPERIENCE IN TYPE OF AIRCRAFT..COPILOT/SECOND PILOT

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