N699TL

ATA 7200

ON 10/3/2018, AT APPROXIMATELY 1300 CST, AIRCRAFT DEPARTED KHOU FOR KLAS. DURING CLIMB AT OR ABOUT FL380, CREW FELT AND UNUSUAL VIBRATION WHICH LASTED TWO TO THREE SECONDS. NO OTHER INDICATION OF MALFUNCTION WAS INDICATED. SEVERAL SECONDS LATER, THE VIBRATION RETURNED, BUT THIS TIME THE LEFT HAND (NR 1) ENGINE ITT INDICATION SPIKED, FOLLOWED BY A REDUCTION IN POWER OF "NEARLY" FIFTY PERCENT (50%) WITHOUT ANY PILOT INPUT. CREW INITIATED REQUIRED CHECKLIST ITEM AND SLOWLY REDUCED POWER TO IDLE WITH NO OTHER INDICATIONS OF MALFUNCTION. CREW CONTACTED ATC AND RETURNED TO KHOU WITHOUT FURTHER INCIDENT. AIRCRAFT LANDED NORMALLY AND THRUST REVERSERS WERE DEPLOYED AS STANDARD PRACTICE. POST INSPECTION AND ECU DOWNLOAD INDICATES POSSIBLE BOV (BLOW OFF VALVE) SOLENOID FAULT. INVESTIGATION CONTINUES.

ATA 3297

AFTER TOUCHDOWN, THE PILOT IN CHARGE ATTEMPTED TO TURN OFF OF THE ACTIVE RUNWAY ONTO THE TAXIWAY, NOTICED THE AIRCRAFT WAS DIFFICULT TO STEER. DURING TURNOFF, THE STEERING SYSTEM DISENGAGED. NORMAL PROCEDURE IS TO REENGAGE THE STEERING SYSTEM, BUT THE SYSTEM WOULD NOT REENGAGE. THE CREW NOTICED THE AIRCRAFT WAS DIFFICULT TO TAXI AND SUSPECTED A TIRE OR TIRES MAY HAVE BEEN FLAT. THE CREW ELECTED TO SHUT DOWN THE AIRCRAFT AND INVESTIGATE. EXTERNAL INSPECTION REVEALED THE TWO RIGHT MAIN TIRES TO BE FLAT, AND FLAT SPOTS ON TREAD THROUGH ALL 14 PLYS OF THE TIRES WERE THE CAUSE. ON INVESTIGATION, TECHNICIANS FOUND AND REPAIRED A PINCHED GROUND WIRE G24B20 LOCATED 22 INCHES FROM CONNECTOR D330 TO THE RIGHT ANTI-SKID VALVE. WITH THIS WIRE PINCHED, IT CAUSED BOTH RIGHT MAIN BRAKES TO LOCK UP IN AIR MODE, NR 3 AND 4 MAIN TIRES AND BRAKES WOULD HAVE BEEN ENGAGED ON TOUCHDOWN. A VISUAL INSPECTION OF THE MLG AND AXLES, ALONG WITH A FUNCTIONAL CHECK OF THE STEERING WAS PERFORMED WITHOUT ADDITIONAL FINDINGS. AIRCRAFT WAS RETURNED TO SERVICE.