NTSB Identification: DEN89LA068.
The docket is stored on NTSB microfiche number 38477.
Accident occurred Monday, January 23, 1989 in LAS CRUCES, NM
Probable Cause Approval Date: 03/25/1991
Aircraft: PIPER PA-34-200T, registration: N3070M
Injuries: 3 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE INSTRUCTOR PLT (CFI) HAD SIMULATED A LOSS OF PWR IN THE RGT ENG & THE STUDENT WAS MAKING AN APCH. THE CFI THEN PULLED THE CIRCUIT BREAKER (CB) FOR THE NORMAL GEAR EXTENTION SYS. THE STUDENT TRIED TO EXTEND THE GEAR WITH THE ALTN SYS, BUT THE LEFT GEAR DID NOT LOCK DOWN. THE CFI PUT THE CB BACK IN & RECYCLED THE GEAR, BUT THE LEFT GEAR STILL DID NOT SHOW DOWN & LOCKED. THE CFI THEN ORDERED A GO-AROUND. THE GO-AROUND WAS INITIATED AT ABOUT 300 FT AGL. WHEN THE THROTTLES WERE ADVANCED, THE CFI NOTED A LACK OF PWR IN THE RGT ENG & TOOK CONTROL OF THE ACFT. HE TRIED TO RESTORE FULL PWR TO THE RGT ENG, WHICH HE PERCEIVED WAS PRODUCING SOME PWR. THE PROP WASN'T FEATHERED. IN THAT CONFIGURATION, THE ACFT MAINTAINED LEVEL FLT, BUT WOULD NOT CLIMB. SUBSEQUENTLY, IT BEGAN TO DESCEND & THE CFI MADE A FORCED LANDING ON ROUGH DESERT TERRAIN. NO REASON FOR THE RPRTD LOSS OF ENG POWER WAS FOUND DRG A SUBSEQUENT INVESTIGATION.

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

THE LOSS OF RIGHT ENGINE POWER FOR UNDETERMINED REASON(S), AND THE FAILURE OF THE INSTRUCTOR PILOT TO FEATHER THE RIGHT ENGINE. FACTORS RELATED TO THE ACCIDENT WERE: FAILURE OF THE LEFT MAIN GEAR LOCKING MECHANISM TO ENGAGE AND THE UNPREPARED (ROUGH/UNEVEN) TERRAIN.

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