N601CN

ATA 7261

ON THE MORNING OF 1/20/24, LEAR 60-087 N601CN, DEPARTED KBFI FLYING TO KEGE. AT CRUISE ALTITUDE, THE #1 ENGINE OIL PRESSURE STARTED TO DROP. THE CAPTAIN CALLED IN TO MAINTENANCE TO INFORM US THE THE SITUATION. THE CREW KEPT FLYING ON THE CHANCE IT WAS AN INDICATION ERROR. THE OIL TEMP WAS THE SAME AS THE #2 ENGINE AND THE LOW OIL PRESSURE LIGHT HAD NOT ILLUMINATED. THE CAPTAIN INFORMED MAINTENANCE THAT IF THE LIGHT CAME ON OR THE PRESSURE CONTINUED TO DROP, THEY WOULD DIVERT INTO KBOI. THE OIL PRESSURE LIGHT TURNS ON AT 20 PSI. THE PRESSURE DID CONTINUE TO DROP AND THE CREW DIVERTED. THEY DECLARED AN EMERGENCY AND LANDED SAFELY AT KBOI. AS THEY WERE ON FINAL, THE LOW PRESSURE LIGHT DID COME ON. THE ENGINE WAS SHUT DOWN SHORTLY AFTER LANDING AND THE AIRCRAFT WAS TAXIED SAFELY TO THE FBO. ATI JET MAINTENANCE WAS SENT TO INVESTIGATE THE ISSUE. AN OIL SEAL ON THE PRIMARY MAGNETIC ALTERNATOR (PMA) WAS WORN AND SLIGHTLY TORN CAUSING THE LEAK. A NEW SEAL WAS INSTALLED AND THE OIL RESERVOIR SERVICED TO FULL. THE ENGINE WAS RUN UP TO FULL POWER, NO LEAKS NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE AND HAS MADE TWO TRIPS WITH NO ISSUES OR LEAKS REPORTED.

ATA 2913

ON 5/27/2022, CYO601 (N601CN) DEPARTED KUES GOING TO KLAS. IN CRUISE FLIGHT THE CREW NOTIFIED ATI MAINTENANCE THAT THE RH HYDRAULIC PRESSURE LIGHT HAD COME ON, HYDRAULIC PRESSURE WAS STEADY. APPROXIMATELY 5 MINUTES LATER, THE CREW NOTIFIED ATI MAINTENANCE THAT THEY HAD LOST 150 PSI OF HYDRAULIC PRESSURE. AFTER NOTIFYING ATIS DIRECTOR OF OPERATIONS, WE INSTRUCTED THE CREW TO LAND AS SOON AS POSSIBLE. THEY ELECTED TO LAND AT KMTJ. THE CREW LANDED THE AIRCRAFT SAFELY WITH NO FURTHER LOSS OF HYDRAULIC PRESSURE. ATI MAINTENANCE WAS SENT TO MTJ, THE RH ENGINE DRIVEN HYDRAULIC PUMP DRIVE SHAFT HAD SHEARED. THE PUMP WAS CHANGED AND THE HYDRAULIC PRESSURE AND RETURN FILTERS WERE PULLED FOR INSPECTION - MINOR CONTAMINATION WAS FOUND IN THE PRESSURE RETURN FILTER. THE FILTER WAS CLEANED AND REINSTALLED. THE HYDRAULIC SYSTEM WAS CYCLED AND FILTERS PULLED AND CLEANED - REPEATED 2 MORE TIMES. NO CONTAMINATION FOUND ON THE LAST REMOVAL. THE AIRCRAFT WAS FLOWN TO KELP AND ATI JET MAINTENANCE REMOVED THE FILTERS AGAIN TO INSPECT FOR CONTAMINATION. A VERY SMALL AMOUNT HAD COLLECTED IN THE RETURN FILTER AND NONE IN THE PRESSURE SIDE. NEW FILTERS WERE INSTALLED AND THE THE AIRCRAFT WAS RETURNED TO SERVICE.

ATA 3697

AFTER DEPARTURE FROM KPBI HEADING TO KMMU WHILE CLIMBING THROUGH 230, THE CREW NOTICED THE LH & RH BLEED LIGHTS ILLUMINATED. AFTER FOLLOWING THE CHECKLIST , THE LIGHTS WENT OUT SO THE CREW ELECTED TO CONTINUE. THEN WHILE CLIMBING THROUGH 310 THE LIGHTS CAME BACK ON, AS THE CREW COMPLETED THE STEPS IN THE CHECKLIST, THE DUCT OVERHEAT LIGHT ILLUMINATED. THE CREW THEN ELECTED TO MAKE AN UNSCHEDULED LANDING INTO KMCO. AN EMERGENCY WAS DECLARED AND THEY DIVERTED. AFTER LANDING SAFELY IN MCO, THE CREW NOTIFIED ATI MAINTENANCE. MAINTENANCE PERSONNEL FROM ATI FLEW TO MCO TO INSPECT N601CN, THE TAIL SECTION WAS OPENED TO ACCESS ALL OF THE BLEED AIR TUBES AND SENSORS. BOTH ENGINES WERE RUN UP TO TAKE OFF POWER FOR SEVERAL MINUTES WHILE MAINTENANCE CHECKED THE TAIL SECTION FOR LEAKS - NO LEAKS WERE FOUND. A FUNCTIONAL CHECK OF THE CREW AND CABIN HEAT SYSTEM WAS COMPLETED AT THE SAME TIME TO DUPLICATE THE DUCT OVERHEAT LIGHT/MALFUNCTION. THE DUCT OVERHEAT LIGHT NEVER CAME ON - COULD NOT DUPLICATE EITHER MALFUNCTION ON THE GROUND. THE AIRCRAFT WAS FLOWN TO KELP (STOPPING IN KHOU FOR FUEL) FOR FURTHER INVESTIGATION AND INSPECTION OF THE BLEED AIR/TEMPERATURE CONTROL SYSTEM.