Haps Air Service, Inc.

AIRCRAFT DEPARTED ON A CHARTER , PILOT WAS OVER LAKE WHEN HE NOTICED ENGINE OIL COMING OUT OF TOP ENGINE COWLING COOLING LOUVERS. PILOT NOTIFIED CONTROL HE WAS LOSING OIL. FEATHERED THE RT ENGINE AND DIVERTED . PILOT MADE UNEVENTFUL SINGLE ENGINE LANDING AND TAXIED TO MAINTENANCE HANGAR. DISCOVERED THE ENGINE WAS SEIZED AND THE COWLING AND NACESSE BOTTOM COVERED WITH OIL. STARTED DISASSEMBLY AND FOUND THE OIL COOLER GASKET, PN 652065, HAD .1250 INCH SECTION MISSING FROM THE UPPER FORWARD AREA OF THE GASKET. (K)

THE PILOT WAS UNABLE TO NORMALLY EXTEND THE LANDING. EMERGENCY GEAR EXTENSION PROCEDURES WERE SUCCESSFUL. SUBSEQUENT INSPECTION REVEALED THAT THE RIGHT GEAR EXTENSION PRESSURE LINE HAD DEVELOPED A .5 INCH CRACK JUST PRIOR TO THE LANDING GEAR UPLOCK ACTUATOR. THE AIRCRAFT LOST HYDRAULIC FLUID. THE CRACK IN A LOCATION WERE THE LINE MADE A 180 DEGREE BEND. THE CRACK APPEARS TO BE CAUSED BY FATIGUE. THE LINE WAS THE ORIGINAL LINE AND WAS 21 YEARS. THE LINE WAS REPLACED. (M)

ON APPROACH WHEN FLAPS WERE SELECTED DOWN, A LOUD BANG WAS HEARD, FOLLOWED BY A SUDDEN RIGHT ROLL OF THE AIRCRAFT. CONTROL WAS REGAINED AND AIRCRAFT WAS LANDED UNEVENTFULLY. UPON INSPECTION, IT WAS DISCOVERED THAT THE RIGHT FLAP CABLE WAS BROKEN AT RBL 18.5, OUTBOARD OF PULLEY (PN 5378.4) LOCATED AT 17.52 RBL. PROBABLE CAUSE APPEARS TO BE FATIGUE. FLAPS HAD BEEN AT 15 DEGREES. HAD THE FLAPS BEEN EXTENDED FULL TRAVEL THE PILOT MAY NOT HAVE REGAINED CONTROL.

MAGNETO FAILED, REMOVED AND DISASSEMBLED AND FOUND SEVERE CORROSION ON DISTRIBUTOR GEAR, PN M-3056, ROTOR GEAR, PN 3828, POINT SET M3081 AND CAPACITOR, PN M-3816. CAUSE OF FAILURE WAS LOCK RING HOLDING PIG TAIL ON CAPACITOR TERMINAL HAD CORRODED AND SPLIT LETTING PIG TAIL CONTACT HOUSING AND SHORTING OUT POINTS. SUBMITTER STATED IT IS CLEAR THIS IS BEING CAUSED BY PRESSURIZATION OF MAGNETOES OFF TURBOCHARGER. PRESSURIZATION LINES SHOULD BE REMOVED.