ENGLEWOOD, CO, USA
N6121R
CESSNA T210F
THE INSTRUCTOR PILOT (CFI) & DUAL STUDENT WERE PRACTICING SIMULATED INSTRUMENT APCHS. DRG AN APCH, THE LANDING GEAR FAILED TO EXTEND. THE PILOTS WERE UNABLE TO EXTEND THE GEAR BY USING EITHER THE NORMAL OR EMERGENCY SYSTEMS. SUBSEQUENTLY, AN APCH WAS MADE TO RWY 17 FOR A WHEELS UP LANDING. TO MINIMIZE THE RISKS OF SPARKS & FIRE, THE CFI ELECTED TO LAND THE ACFT ON DIRT, SHORT OF THE THRESHOLD, THEN ALLOW THE ACFT TO SKID ONTO THE PAVED RWY. HOWEVER, HE WAS UNAWARE OF A 6 INCH LIP AT THE RWY THRESHOLD. THE CFI RPRTD THAT DRG THE WHEELS UP LANDING, THE ACFT STRUCK THE RAISED LIP, WHICH RESULTED IN A HARD IMPACT. THE CFI RECEIVED A COMPRESSION FRACTURE OF HIS BACK. A POST-ACDNT EXAM OF THE HYDRAULIC POWER UNIT REVEALED A 'LEE PLUG' HAD 'BLOWN OUT.' WITH THE PLUG OUT, NO ENG DRIVEN OR EMERGENCY PUMP PRESSURE COULD HAVE BEEN APPLIED TO THE GEAR EXTENSION SYSTEM.
A FAILURE IN THE HYRDRAULIC POWER UNIT, WHICH PREVENTED OPERATION OF EITHER THE NORMAL OR EMERGENCY GEAR EXTENSION SYSTEMS. THE RAISED RUNWAY LIP CONTRIBUTED TO AIRCRAFT DAMAGE AND PILOT INJURY.
Source: NTSB Aviation Accident Database
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