N76

Part: CONTROLLER — FAILED (CABIN PRESSURE) · airframe 16,380 hrs · 8,476 cycles

CABIN ALT WARNING ILLUMINATED IN FLIGHT CABIN DIFF SHOWS "0". AIR PRESSURE CONTROLLER REPLACEMENT CORRECTED ISSUE.

Part: DOOR — NOISY (CABIN) · airframe 15,715 hrs · 8,139 cycles

PASSING 11,000 MSL, CABIN LOST PRESSURE. MS REPORTS HISSING SOUND FROM CABIN DOOR.

Part: PCB — LOOSE (LOGIC RELAY) · airframe 15,550 hrs · 8,062 cycles

RUDDER BOOST OFF LIGHT ILLUMINATED. RUNNING THE ABNORMAL CHECKLIST MADE NO DIFFERANCE. DISCOVERED LOOSE RELAY AND SOCKET. REPLACED LOGIC RELAY PCB. RUDDER BOOST LAMPS WORKING CORRECTLY. NO FURTHER ACTION REQUIRED.

Part: FILTER — RESTRICTED (SAFETY VALVE) · airframe 15,218 hrs · 7,911 cycles

DUE TO A RESTRICTED SAFETY VALVE FILTER, PRESSURIZATION SYSTEM FAILED IN FLIGHT. SYSTEM PERFORMED WITHOUT FURTHER ISSUE AFTER FILTER WAS CLEANED. NO NOTED TREND

Part: WARNING LIGHT — ILLUMINATED (COCKPIT) · airframe 14,090 hrs · 7,369 cycles

THE IN TRANSIT LIGHT REMAINED ON WHEN THE GEAR WAS RETRACTED. WHEN MOVED TO THE DOWN POSITION, RECEIVED THREE GREEN, NO RED. GEAR DOWN AND LOCKED, LANDED WITHOUT INCIDENT.

Part: AUTOFEATHER SYS — MALFUNCTIONED (PROPELLER) · airframe 13,780 hrs · 7,213 cycles

DURING RUN UP AUTO FEATHERS CHECKED SAT. DURING POWER UP ON TAKEOFF ROLL AUTO FEATHERS ARMED AT APPROX 80 KTS PLUS LEFT AUTO FEATHER LIGHT WENT OUT. TAKEOFF ABORTED. STOPPED ON RUNWAY, DID A RUN UP AND AUTO FEATHER ARMED. BEGAN A SECOND TAKEOFF ROLL AND AT APPROX 80 KTS PLUS LEFT AUTO FEATHER LIGHT WENT OUT AGAIN. TAKEOFF ABORTED.

Part: WIRE — BROKEN (FIRE BOTTLE) · airframe 13,496 hrs · 7,068 cycles

ON TAKEOFF ROLL AT APPROX 60 KIAS, PNF OBSERVED DISCHARGED LIGHT ILLUMINATION ON LEFT FIRE BOTTLE. PNF CALLED OUT AN ABORT AND PF ABORTED TAKEOFF. CREW TAXIED AIRCRAFT TO HANGAR WITH NO FURTHER INCIDENT. FOUND BROKEN WIRE TO NR 1 FIRE BOTTLE. REPAIRED BROKEN WIRE, SYSTEM OPS CHECKED GOOD.

Part: PROXIMITY SWITCH — DEFECTIVE (RT PROPELLER) · airframe 12,592 hrs · 6,621 cycles

IN CRUISE FLIGHT AT 16000 MSL, RIGHT PROP PITCH ANNUNCIATOR ILLUMINATED. NO OTHER INDICATIONS ON INSTRUMENTS. NO AFFECTS ON AIRCRAFT HANDLING WERE DETECTED IN FLIGHT. CREW ELECTED TO RETURN TO HOME BASE. IN ANTICIPATION OF POSSIBLE ASYMMETRIC THRUST ON LANDING, DECLARED EMERGENCY SO THAT EMERGENCY EQUIPMENT WOULD BE STANDING BY. LANDING WAS UNEVENTFUL. MAINTENANCE REMOVED AND REPLACED DEFECTIVE RIGHT PROP PROXIMITY SWITCH.

Part: LANYARD — BROKEN (FUEL CAP) · airframe 12,532 hrs · 6,588 cycles

AFTER TAKEOFF FUEL WAS STREAMING FROM RIGHT MAIN FUEL CAP WITH FUEL CAP FLUSH WITH AIRCRAFT SURFACE. REQUESTED PRIORITY HANDLING FROM TOWER, LANDING WAS UNEVENTFUL. MAINTENANCE DISCOVERED LANYARD WAS BROKEN AND CAUGHT BETWEEN FUEL CAP AND SEALING SURFACE.

Part: SHRADER VALVE — LEAKING (LANDING GEAR) · airframe 12,492 hrs · 6,568 cycles

ON APPROACH, LOWERED LANDING GEAR AND NO AUDIBLE SOUND HEARD NOR ANY LIGHTS INDICATED IN GEAR HANDLE OR ON POSITION LIGHTS. FLAPS LOWERED TO FULL POSITION IN ORDER TO CONFIRM ABNORMAL INDICATION. LANDING GEAR HORN SOUNDED INDICATING GEAR WAS NOT IN DOWN POSITION. WHILE COMPLETING ABNORMAL CHECKLIST NOTED LANDING GEAR C/B WAS POPPED. CHOSE TO DIVERT BACK TO BASE AIRPORT. ON APPROACH, EMERGENCY DECLARED, ABNORMAL CHECKLIST REVIEWED, LANDING GEAR MANUALLY LOWERED AND CORRECT GEAR DOWN/LOCKED INDICATION OBTAINED. GEAR VISUALLY CONFIRMED DOWN BY TOWER. MAINTENANCE FOUND VALVE ASSY ON ACCUMULATOR LEAKING AT BASE. REMOVED/REPLACED VALVE ASSY AND SERVICED ACCUMULATOR.

Part: CONNECTOR — LOOSE (ZONE 700) · airframe 12,338 hrs · 6,489 cycles

FLAPS AT APPROACH POSITION. SELECTED LANDING GEAR DOWN. POSITION INDICATORS SHOWED GREEN FOR NOSE AND LEFT MAIN GEAR. NO INDICATION ON RIGHT MAIN GEAR. CHECKED ANNUNCIATOR, GOOD. SELECTED FLAPS FULL DOWN AND RECEIVED CONFIGURATION WARNING HORN. DECLARED EMERGENCY WITH APPROACH. FOLLOWED ABNORMAL PROCEDURES CHECKLIST. OBTAINED DOWN AND LOCKED INDICATION AFTER MANUALLY PUMPING DOWN THE GEAR. CONDUCTED TOWER FLY BY TO VERIFY. VERIFIED THAT CONFIGURATION WARNING HORN DID NOT OCCUR WITH FULL FLAPS SELECTED. CONDUCTED UNEVENTFUL LANDING. AIRCRAFT TOWED TO HANGAR AND PLACED ON JACKS. DUPLICATED DISCREPANCY. INSPECTED RT DOWNLOCK SWITCH AND WIRING. FOUND S506 CONNECTOR LOOSE. SECURED CONNECTOR. OPERATION FOUND GOOD ON SEVERAL GEAR RETRACTION CYCLES.

Part: WARNING LIGHT — FALSE INDICATION (MLG)

ON FINAL APPROACH, LOWERED GEAR AT FAF - NO LEFT MAIN GEAR LIGHT. CYCLED GEAR ONCE INSIDE FAF - STILL NO LIGHTS, EXECUTED FLY BY RWY 4R. 2 AIRLINE CREWS ADVISED ALL 3 GEARS APPEAR DOWN. FLEW LT TRAFFIC, CYCLED GEAR 3RD TIME, OBSERVED GEAR RETRACT AND EXTEND. (K)

Part: ODOR — DETECTED (COCKPIT)

ON DOWNWIND AFTER BPC RUN, SMELLED ELECTRICAL BURNING. NOTICED NUMBER 2 COMM NO LED READOUT. PULLED CB NR 2 COMM DUMPED CABIN. SMELL DID NOT DISPERSE TO OUR EXPECTATION. LANDED AIRCRAFT. (M)

Part: POWER SUPPLY — BURNED (NR 2 COMM)

ON DOWNWIND AFTER BPC RUN, SMELLED ELECTRICAL BURNING. NOTICED NUMBER 2 COMM NO LEAD READOUT. PULLED CB NUMBER 2 COMM DUMPED CABIN. SMELL DID NOT DISPERSE TO OUR EXPECTATION. LANDED AIRCRAFT. FOUND NR 2 COMM POWER SUPPLY BURNED, REPLACED NR 2 COMM. (M)

Part: COOLING FAN — BURNED (INERTIAL REF UNT)

WHILE SETTING UP FOR FLIGHT INSPECTION MANEUVER, GOT A RED MASTER CAUTION LIGHT WITH AN AP TRIM DISC LIGHT. TEMPORARILY LOST TCAS, PILOTS FLIGHT DIRECTOR, AND THE PILOTS NCU. AT THE SAME TIME HEARD ELECTRICAL SHORTING SOUND. STRONG ELECTRICAL FUMES WERE DETECTED AND THE CREW DONNED O2 MASK. COPILOT INFORMED APPROACH OF THEIR STATUS AND REQUESTED A FULL STOP LANDING. SHORTLY AFTER THE POWER INTERRUPTION, PILOTS NCU CAME BACK UP. COPILOT TURNED OFF THE MISSION EQUIPMENT AND THE MSU TO REDUCE CHANCES OF ELECTRICAL FIRE AND THE AIRCRAFT WAS DEPRESSURIZED ON FINAL IN AN ATTEMPT TO REDUCE FUMES. THE CREW MADE AN UNEVENTFUL LANDING. FOUND LASER REFERENCE COOLING FAN SHORTED.

Part: INDICATOR — FALSE INDICATION (COCKPIT)

ON TAKEOFF ROLL AT 70KIAS, THE 1 TORQUE GAUGE JUMPED FROM 35 TO 120 WITH THROTTLES ALIGNED. RIGHT TORQUE DID NOT EXCEED 70 TAKEOFF ABORTED. REMOVED AND REPLACED NR 1 TORQUE INDICATOR. OPS CHECK SATISFACTORY. (M)