What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: during final approach at ism, pilot activated the landing gear; heard gear motor engage and continued descent. Upon crossing runway threshold at approximately 15 feet above surface, pilot cut throttles and heard a warning buzzer, inadvertently mistaking it as a stall warning instead of a gear up warning. In an effort to go around, the propellers contacted the runway as the plane started to gain altitude. When the plane began to roll left, the pilot quickly leveled and landed with gears up. During recovery the gear remained retracted for at least 90 seconds before it finally extended. Inspection of the left main wheel well revealed a large hydraulic stain which apparently discharged from the left gear extension cylinder. Subsequently, maintenance found that the main end cap o-ring (an 6227B-10) failed. This o-ring contains the fluid and keeps it from leaking externally on the landing gear down pressure side. It was determined the o-ring was installed with a twist, which caused a pre-load in the cross section, which eventually covered the failure and subsequent fluid loss during the landing phase.
As the FAA filed it
NARRATIVE: DURING FINAL APPROACH AT ISM, PILOT ACTIVATED THE LANDING GEAR; HEARD GEAR MOTOR ENGAGE AND CONTINUED DESCENT. UPON CROSSING RUNWAY THRESHOLD AT APPROXIMATELY 15 FEET ABOVE SURFACE, PILOT CUT THROTTLES AND HEARD A WARNING BUZZER, INADVERTENTLY MISTAKING IT AS A STALL WARNING INSTEAD OF A GEAR UP WARNING. IN AN EFFORT TO GO AROUND, THE PROPELLERS CONTACTED THE RUNWAY AS THE PLANE STARTED TO GAIN ALTITUDE. WHEN THE PLANE BEGAN TO ROLL LEFT, THE PILOT QUICKLY LEVELED AND LANDED WITH GEARS UP. DURING RECOVERY THE GEAR REMAINED RETRACTED FOR AT LEAST 90 SECONDS BEFORE IT FINALLY EXTENDED. INSPECTION OF THE LEFT MAIN WHEEL WELL REVEALED A LARGE HYDRAULIC STAIN WHICH APPARENTLY DISCHARGED FROM THE LEFT GEAR EXTENSION CYLINDER. SUBSEQUENTLY, MAINTENANCE FOUND THAT THE MAIN END CAP O-RING (AN 6227B-10) FAILED. THIS O-RING CONTAINS THE FLUID AND KEEPS IT FROM LEAKING EXTERNALLY ON THE LANDING GEAR DOWN PRESSURE SIDE. IT WAS DETERMINED THE O-RING WAS INSTALLED WITH A TWIST, WHICH CAUSED A PRE-LOAD IN THE CROSS SECTION, WHICH EVENTUALLY COVERED THE FAILURE AND SUBSEQUENT FLUID LOSS DURING THE LANDING PHASE.
Other reports on N6701V · 2
Matched to the same aircraft by N-number and date.