N384CW

ATA 5711

Part: SPAR — CORRODED (WING) · airframe 8,592 hrs · 6,428 cycles

DURING AN UNSCHEDULED MAINTENANCE VISIT, WHILE INVESTIGATING A FUEL LEAK, CORROSION WAS DISCOVERED ON BOTH FORWARD AND BOTH AFT WING SPAR SPLICES ON THE UNDERSIDE OF THE WING DIRECTLY ABOVE THE SKID RAILS.

ATA 2150

Part: ACM — SMOKE (AFT) · airframe 8,412 hrs · 6,290 cycles

WHILE PERFORMING A TEST FLIGHT FOR A STABILIZER REPLACEMENT, CREW REPORTED A GREY BLUISH SMOKE BEGAN FILLING CABIN & COCKPIT. RETURNED TO KTUL. REPLACED FORWARD AIR CYCLE MACHNE AND FORWARD AND AFT WATER SEPARATOR SOCKS. FORWARD AND AFT ACM OIL WAS SERVICED. AN OPERATONAL CHECK OF AIR CONDITIONING SYSTEM WAS PERFORMED. THE OPERATIONAL CHECKS WERE GOOD & NO LEAKS WERE NOTED FOLLOWING A 30 MINUTE GROUND RUN. AIRCRAFT RETURNED TO SERVICE. CREW REPORTED THAT SMOKE WAS FILLING THE CABIN & COCKPIT. SMOKE HAD DISSIPATED AFTER AIRCRAFT RETURNED TO KTUL. CREW PERFORMED A GROUND RUN OF AIRPLANE & THERE WERE NO FURTHER INDICATIONS OF SMOKE.

ATA 5531

Part: RIB — CRACKED (VERTICAL STAB) · airframe 7,327 hrs · 5,432 cycles

WHILE INVESTIGATING A SUSPECTED WATER LEAK IN THE BAGGAGE COMPARTMENT MAINTENANCE DISCOVERED AN APPROXIMATELY 2.5 CRACK IN THE RIGHT LOWER VERT STAB LEADING EDGE SKIN P/N 6231276 AT APPROXIMATELY WL 160. AFTER REMOVING SKIN FOR REPLACEMENT IT WAS DISCOVERED THAT RIB P/N 6231270-28 HAD AN APPROX 2.5 CRACK IN THE SAME LOCATION AS THE OVERLYING SKIN. AFTER REMOVAL OF THE RIB, IT WAS DISCOVERED THAT THE 2 MOST FORWARD FASTENER HOLES ON THE RIGHT FLANGE OF THE RIB WERE NOT DRILLED AS THEY WERE ON THE OPPOSITE FLANGE OF THE RIB. IT IS SUSPECTED THAT DUE TO THE LACK OF THESE TWO FASTENERS THE RIB FLANGE WAS SUBJECT TO IMPROPER STRESS DISTRIBUTION CAUSING A DEFECT IN THE OVERLYING SKIN. THIS HAS OCCURRED ON 2 OTHER