N990HA

Part: GEARBOX — CRACKED (NR 3 ENGINE)

RECEIVED WO TO PERFORM FWD HYD PUMP SEAL REPLACEMENT ON GEARBOX ENG#3 DUE TO SUSPECT ENGINE OIL LEAK. NOTED HYD LEAK INSTEAD OF OIL LEAK. NOTED ALSO LOWER ENGINE COWL ENGINE OIL CONTAMINATED. PERFORMED ENGINE RUN UP AND FOUND CRACK ON GEARBOX.

Part: CONTROL UNIT — MALFUNCTIONED (LANDING GEAR) · airframe 3,582 hrs · 1,175 cycles

APPROXIMATELY AT 12:00 PM I ARRIVED AT KHPN FROM A FLIGHT FROM KATL, AND RENTED A VEHICLE TO KTEB TO ANSWER A CALL FOR MAINTENANCE OVERSITE ON AIRCRAFT S/N-036. THE PIC DECLARED AN EMERGENCY ON LANDING INTO KTEB AIRPORT FROM KOXC AIRPORT. UPON LANDING WITH EMERGENCY LANDING GEAR EXTENSION EXECUTED, THE AIRCRAFT LANDED SAFELY. EMERGENCY VEHICLES WERE ON STANDBY AT THE AIRCRAFT JUST IN CASE, AND THE AIRCRAFT WAS TOWED WITH GEAR PINS IN PLACE, JUST AS A PRECAUTIONARY MEASURE, DUE TO THE AIRCRAFT HAVING NO STEERING AS A RESULT OF EMERGENCY LANDING GEAR EXTENSION BEING EXECUTED. UPON ARRIVAL, AT APPROX. 1330, FOUND AIRCRAFT OUTSIDE WAITING TO BE TOWED TO A HANGAR. AFTER PLACEMENT OF AIRCRAFT, JACKING TOOK PLACE AND GEAR SWINGS ENSUED FOR TROUBLESHOOTING MEASURES. AT ABOUT 1500, AND AFTER SWINGING THE GEAR SEVERAL TIMES, WE COULD NOT GET THE PROBLEM TO REOCCUR BUT THE CODES IN THE CMC STAYED LATCHED. AFTER FURTHER TROUBLESHOOTING DEEP INTO THE CMC AND PULLING CIRCUIT BREAKERS TO CLEAR CODES, CODES WOULD NOT UNLATCH AND CAME BACK, ALL TROUBLESHOOTING POINTED TO THE LGSCU (LANDING GEAR AND STEERING CONTROL UNIT). AT ABOUT 1600, UPON VERIFYING PROBLEM, ORDERED LGSCU AND LUCKILY THEY HAD A PART IN STOCK. FURTHER TESTING AT ABOUT 1700, OF CONNECTORS GROUND AND POWER PIN OUTS FOR THE LGSCU PROVED TO BE POSITIVE. NO OTHER CIRCUITS WERE INVOLVED THROUGH TESTING OF THE INPUT AND OUTPUT OF THE LGSCU. AFTER ARRIVAL OF PARTS, THE TEAM INSTALLED WITHOUT INCIDENT. TESTING AFTER LGSCU INSTALL, WENT WELL. LANDING GEAR PERFORMED WELL WITH THE HYDRAULIC MULE CONNECTED. NO LATCHED MESSAGES WERE ENCOUNTERED DURING CYCLING OF THE GEAR. THE TEAM ALSO TESTED THE SQUAT SWITCHES WITH NO DEFECTS AT THIS TIME. DOWN JACKED THE AIRCRAFT AND FINISHED THE PAPERWORK AT ABOUT 2430.

Part: CABIN PRESSURE — MALFUNCTIONED · airframe 3,456 hrs · 1,115 cycles

AIRCRAFT DEPARTED, ONCE THE THE AIRCRAFT HAD REACHED ALTITUDE ABOVE FL350, UNABLE TO KEEP PRESSURE CONTROL EITHER VIA AUTO OR MANUAL, CABIN CLIMB OR DESCENT VARIES AT ABOUT 450FPM.BELOW FL340 NORMAL OPS.AIRCRAFT RETURNED TO FOR REPAIRS

Part: DISPLAY — SMOKE (COCKPIT) · airframe 12,826 hrs · 15,513 cycles

ELECTRICAL FUMES NOTED ON FINAL APPROACH. SOURCE OF FUMES WAS DETERMINED TO BE THE FMS. THE FMS WAS MEL''D ON FEBRUARY 10, 2001 FOR THE SAME PROBLEM. THE UNIT WAS DEACTIVATED PER EO8-34-01-629, UNIT CONTINUED MEL''D.

Part: RIVETS — MISSING (BS 167)

FOUND 3 RIVETS MISSING IN STRINGER 31S TO FRAME X167 GUSSET JOINT. ONE HOLE HAD A CLECO STILL INSTALLED FROM FACTORY. REMOVED CLECO AND INSTALLED RIVETS.

Part: GROUND LOCK — ENGAGED (NLG)

AFTER TAKEOFF, THE NOSE LANDING GEAR WOULD NOT RETRACT. AIRCRAFT RETURN TO THE AIRPORT. FOUND NOSE LANDING GEAR GROUND LOCK WAS STILL ENGAGED. GROUND LOCK WAS PROPERLY STOWED.

Part: POWER SUPPLY — INOP (CABIN)

LEFT FWD EMERGENCY LIGHT INOP. REMOVED AND REPLACED 3352-P2 POWER SUPPLY BASE AND 3351-PS3 POWER SUPPLY.

Part: DIODE — FAILED (CABIN)

FLT 3416 - FLL-TPA - DURING PREFLIGHT CHECKS, THE INTERIOR AND EXTERIOR LIGHTS ILLUMINATED WITH SWITCH IN OFF POSITION. REMOVED AND REPLACED DIODE 3351-CR5 AND POWER SUPPLY BASE FOR 3351-PS2. (M)

Part: POWER SUPPLY — FAILED (CABIN)

FLT 3416 - FLL-TPA - DURING PREFLIGHT CHECKS, THE INTERIOR AND EXTERIOR LIGHTS ILLUMINATED WITH SWITCH IN OFF POSITION. REMOVED AND REPLACED DIODE 3351-CR5 AND POWER SUPPLY BASE FOR 3351-PS2. (M)

Part: LIGHT — INOPERATIVE (CABIN)

TLH/MCO - FLT 3085 - DURING PRE-FLIGHT CHECKS, FOUND FIRST AND THIRD OVERHEAD EMERGENCY LIGHTS INOPERATIVE. SWAPPED POWER SUPPLIES PS3 AND PS2, ALL OPERATIONS NORMAL. (X)