N923SK

ATA 3610

Part: MIXING VALVE — MALFUNCTIONED · airframe 7,451 hrs · 5,136 cycles

CREW ENCOUNTERED CABIN ALTITUDE WARNING INDICATION WHILE IN CRUISE FLIGHT AT FL410 ON 6/18/2009, CABIN ALTITUDE INCREASED TO 10,000 FT PLUS. PERFORMED DESCENT TO LOWER ALTITUDE AND DIVERTED. FERRIED ACFT FOR REPAIRS IAW MEL LIMITATIONS. FOUND RT BLEED AIR MIXING, REGULATING, AND SHUTOFF VALVE ASSY. LOW PRESSURE SERVO NOT RESPONDING TO COMMAND INPUTS. ALSO NOTED FILTER ON CABIN PRESSURE CONTROLLER LAYING LOOSE ON TRAY BELOW, RETAINER MISSING. REPLACED RT BLEED AIR MIXING, REGULATING, AND SHUTOFF VALVE ASSY. WITH OVERHAULED VALVE ASSY. REINSTALLED CABIN PRESSURE CONTROLLER AFTER REPAIRS. SHIMMED LEAKING LT COCKPIT SIDE WINDOW AS REQUIRED. CABIN PRESSURIZATION SYS OPERATIONS NORMAL ON GROUND TESTS.

ATA 2130

Part: WARNING LIGHT — ILLUMINATED (CABIN PRESSURE)

DEPARTED, ENROUTE (WITH 8 ON BOARD). UPON REACHING FL410 AND AFTER APPROX 35 MINUTES IN FLIGHT, THE "PRESS SYS" LIGHT ILLUMINATED. BEGINNING AN EMERGENCY DESCENT, IT WAS NOTED THAT THE `EMER PRESS` LIGHT HAD ALSO ILLUMINATED. THE CABIN CLIMB WAS ARRESTED THEN BEGAN TO DESCEND DURING THE ACFT DESCENT. ACFT DIVERTED AND THE WAS BROUGHT TO AN UNEVENTFUL AND SAFE LANDING. AT THIS TIME PROBLEM WITH PRESSURIZATION IS UNDETERMINED. ACFT IS BEING INSPECTED FOR OVERWEIGHT LANDING. (K)

ATA 7200

Part: ENGINE — LEAKING (SEAL)

ACFT DEPARTED WITH NO PASSENGERS AND 2 FLIGHT CREW. SHORTLY AFTER TAKEOFF AT APPROX 3500 FT, CREW NOTED SMOKE IN THE COCKPIT. CREW TOOK EMERGENCY PROCEDURES AND ASK ATC TO RETURN IMMEDIATELY WITH PREFERENTIAL TREATMENT. LANDING WAS UNEVENTFUL, ACFT TAXIED OFF ACTIVE RUNWAY BEFORE SHUTTING DOWN ENGINES, OMP WERE CONTACTED FOR INSP AND MX ON ACFT. FINDINGS TO DATE ARE: ENGINE IS LEAKING OIL THROUGH ONE OF THE FWD ENG SEALS, ENG WILL NEED TO BE REMOVED AND INSPECTED TO DETERMINE DAMAGE. ACFT IS ALSO BEING INSPECTED FOR OVERWEIGHT LANDING. (K)

ATA 7261

Part: ENGINE — LEAKING (RIGHT) · airframe 7,225 hrs · 4,996 cycles

SUNDAY MORNING 11-16-08 ON A PART 91 FLIGHT FROM KCLL TO KDAL APPROXIMATELY 20 MIKES SOUTH OF KDAL PILOT REPORTED SMOKE IN CABIN. AT THAT POINT THE CREW DECLARED AN EMERGENCY, AND WERE GIVEN PRIORITY LANDING. LANDED WITHOUT INCIDENT AT KDAL. MAINT RAN ENGINES AND FOUND RT ENGINE OIL LEAK INTO BYPASS AIR TO BE IN BLEED AIR DUCTS.

ATA 3460

Part: FMC — FAILED (NR 2)

ACFT WAS CONDUCTING A PART 91 FLIGHT. SHORTLY AFTER TAKEOFF, THEY LOST THE FLIGHT DIRECTOR AND THE FMS ON PIOTS SIDE. THE CREW ATTEMPTED TO RESET THE SYS, STILL UNABLE TO BRING THE FLIGHT DIRECTOR BACK UP. THE CREW MADE THE DECISION TO RETURN TO DEPARTURE. THEY LANDED WITHOUT INCIDENT. MG SWAPPED NR 1 AND NR 2 FLIGHT CONTROL COMPUTERS (FCC) AND PERFORMED SATISFACTORY FUNCTIONAL TEST. FOUND NR 2 FLIGHT MANAGEMENT COMPUTER (FMC) BAD. INSTALLED NEW FMC AND PERFORMED SATISFACTORY FUNCTIONAL TEST. (K)