NTSB Identification: DEN87FA003.
The docket is stored on NTSB microfiche number 32535.
Accident occurred Sunday, October 12, 1986 in DENVER, CO
Aircraft: MITSUBISHI MU-2B-20, registration: N3MU
Injuries: 2 Uninjured.

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.

ACFT HAD BEEN REPOSSESSED AND WAS BEING FERRIED FROM GRAND JUNCTION, CO, TO CHICAGO, IL, WITH EN ROUTE STOP AT DENVER, CO. AFTER TAKEOFF FROM DENVER, LANDING GEAR WOULD NOT RETRACT. PLT MADE SEVERAL ATTEMPTS WITHOUT SUCCESS. HE ELECTED TO RETURN TO DENVER. PLT SAID THAT ON FINAL APCH THE RIGHT ENG BEGAN SURGING AND THE LEFT ENG WOULD NOT INCREASE PWR. ACFT MADE HARD LANDING ON RWY, BREAKING LEFT WING. INVESTIGATION REVEALED BOTH SPEED LEVERS WOULD NOT FUNCTION BECAUSE ENG PROP GOVERNORS AND UNDERSPEED FUEL GOVERNOR RESET ARMS, SPLINED ONTO UNDERSPEED FUEL GOVERNOR SHAFTS, WERE POSITIONED ON OPPOSITE SIDE OF SPEED LEVER ACTUATING ARMS. LANDING GEAR FUNCTIONED NORMALLY DURING SWING TESTS. IT WAS LATER LEARNED THAT RIGHT MAIN TIRE HAD BLOWN ON TAKEOFF 3 DAYS EARLIER AND REQUIRED REPAIR. MAINTENANCE PERSONNEL OPENED THE LANDING GEAR CIRCUIT BREAKERS TO PRECLUDE INADVERTENT GEAR RETRACTION. PLT SAID HE CHECKED CIRCUIT BREAKERS WHEN GEAR FAILED TO RETRACT.

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

AIRSPEED(VREF)..BELOW..PILOT IN COMMAND

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

DIVERTED ATTENTION..PILOT IN COMMAND

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

CHECKLIST..NOT FOLLOWED..PILOT IN COMMAND

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

PROPELLER GOVERNOR CONTROL,LINKAGE..INCORRECT

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

STALL..INADVERTENT..PILOT IN COMMAND

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

AIRCRAFT PREFLIGHT..INADEQUATE..PILOT IN COMMAND

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

MAINTENANCE..NOT CORRECTED..COMPANY MAINTENANCE PERSONNEL

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

MAINTENANCE,SERVICE OF AIRCRAFT/EQUIPMENT..INADEQUATE..OTHER MAINTENANCE PERSONNEL

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

ELECTRICAL SYSTEM,CIRCUIT BREAKER..OPEN


Contributing Factors

ELECTRICAL SYSTEM,CIRCUIT BREAKER..NOT ENGAGED



Contributing Factors

MAINTENANCE..INADEQUATE..COMPANY MAINTENANCE PERSONNEL


Contributing Factors

LACK OF FAMILIARITY WITH AIRCRAFT..PILOT IN COMMAND


Contributing Factors

LANDING GEAR..INOPERATIVE



Contributing Factors

LACK OF FAMILIARITY WITH AIRCRAFT..COPILOT/SECOND PILOT


Contributing Factors

LANDING GEAR,GEAR INDICATING SYSTEM..FALSE INDICATION

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