N501UP
Registered owner: CORPORATE FLIGHT MANAGEMENT INC DBA, TN (owner ≠ operator)
Operators of this aircraft
Who operated this tail, and how firmly we know it.
| Operator | Role | Period | Basis |
|---|---|---|---|
| CIRCADIAN AVIATION LLC (O2GA) | Certificate holder | — | Matched by certificate designator |
Accident & incident history
No NTSB accidents or incidents on file for this aircraft.
Maintenance disclosures
ON APPROACH HAD NOSE GEAR UNSAFE INDICATION. NOSE GREEN LIGHT DID NOT TEST EITHER. LANDING GEAR UNSAFE EMERGENCY PROCEDURE USED TO BLOW DOWN LANDING GEAR. UNEVENTFUL LANDING. REMOVED NOSE GEAR HYDRAULIC SHUTTLE VALVE P/N 98120 SN 2046 AND INSTALLED OVERHAULED NOSE GEAR SHUTTLE VALVE PN 98120 SN 4677A IAW CE560XL MM 32-30-08. OPS AND LEAK CHECK SATISFACTORY IAW 32-30-00.
EMERGENCY DECLARED ON LANDING. ON APPROACH GEAR DOWN SELECTED, R/H MAIN GEAR LIGHT DID NOT ILLUMINATE AND RED UNLOCK LIGHT WAS ILLUMINATED. DECLINED THE APPROACH CLEARANCE TO RUN THROUGH THE CHECKLIST COMPLETELY TO INCLUDE BLOWING THE NITROGEN BOTTLE. NEITHER TOWER NOR A MEDIVAC HELICOPTER WITH NIGHT VISION GOGGLES COULD CONFIRM GEAR DOWN (ALL AT NIGHT). ON SHORT FINAL WHEN THROTTLE PULLED BACK, THE GEAR WARNING HORN BLASTED CONTINUOUSLY. LANDED AT VREF ON LH MAIN GEAR FIRST, THEN NOSE, THEN RH MAIN GEAR WHICH DID NOT COLLAPSE. THE GEAR HORN CONTINUED TO SOUND ALL THE WAY TO THE FBO. THE AIRCRAFT WAS FERRIED GEAR DOWN TO A SUITABLE LOCATION FOR REPAIR.
DURING CRUISE FLIGHT FELT A BANG FOLLOWED BY A RED LANDING GEAR UNLOCK ANNUNCIATOR AND HYDRAULIC PRESSURE ANNUNCIATOR LIGHT. EMERGENCY DECLARED. FOLLOWED CHECKLIST, LOWERED GEAR AND DIVERTED TO KPIT, LANDING WAS UNEVENTFUL. AIRCRAFT WAS FERRIED TO THE KGSO FOR MAINTENANCE. MAINTENANCE FOUND THE NLG ROLLER SUPPORT BRACKETS SLIGHTLY BENT CAUSING NLG TO SLIP OFF THE BRACKET INSIDE THE WHEEL WELL, REPLACED BRACKETS. GEAR SWINGS PERFORMED WITH NO DEFECTS NOTED. AIRCRAFT RELEASED FOR OPERATIONAL CHECK FLIGHT.
AFTER TAKE-OFF THE LANDING GEAR RED UNLOCK LIGHT REMAINED ILLUMINATED, THE HYDRAULIC LIGHT WAS ILLUMINATED, AND THE STAB MIS-COMPARE LIGHT WAS ALSO ILLUMINATED. AFM CHECKLIST WAS FOLLOWED, EMERGENCY WAS DECLARED, AND DIVERSION WAS MADE TO AN ALTERNATE AIRPORT. LANDING WAS UNEVENTFUL. THE AIRCRAFT WAS FERRIED FOR GEAR MAINTENANCE. THE NLG WAS REPAIRED AND THE SHIMMY DAMPENER WAS REPLACED. A SUCCESSFUL OPERATIONAL CHECK FLIGHT WAS PERFORMED. AIRCRAFT WAS RETURNED TO SERVICE.
STAB MIS-COMPARE ANNUNCIATOR ILLUMINATED WHEN FLAP SELECTOR WAS SELECTED TO ZERO POSITION. AIRSPEED WAS BELOW 200 KYS. EMERGENCY DECLARED BY ATC AND DIVERTED TO ALTERNATE DESTINATION. MAINTENANCE ADJUSTED THE HORIZONTAL STABILIZER POSITION SWITCH. GROUND OPERATIONAL CHECKS COMPLIED WITH. NO DEFECTS NOTED. A SUCCESSFUL OPERATIONAL CHECK FLIGHT WAS PERFORMED. AIRCRAFT WAS RETURNED TO SERVICE.
STAB MIS-COMPARE ANNUNCIATOR ILLUMINATED AFTER FLAP RETRACTION DURING INITIAL CLIMB. AIRSPEED LIMITS WERE NOT EXCEEDED. HYD PRESS ANNUNCIATOR REMAINED ILLUMINATED UNTIL GEAR EXTENSION FOR LANDING. EMERGENCY WAS DECLARED AND AFM CHECKLIST PROCEDURE WAS FOLLOWED. DIVERTED TO KDEN. MAINTENANCE TROUBLESHOT AND FOUND TWO-POSITION STAB PCB FAULTY. REPLACED SAME. GROUND OPERATIONAL CHECKS PERFORMED WITH NO DEFECTS NOTED. AIRCRAFT WAS RELEASED FOR OPERATIONAL CHECK FLIGHT.
ON CLIMB OUT RED GEAR UNLOCK LIGHT ILLUMINATED FOLLOWED BY 'HYD PRESS' ANNUNCIATOR. FOLLOWED CHECKLIST, DIVERTED TO MCO, AIRPORT EMERGENCY RESCUE TEAM NOTIFIED AND WERE STANDING BY. LANDING WAS UNEVENTFUL. MAINTENANCE REPLACED THE LEFT AND NOSE GEAR UP-LOCK SWITCHES. GEAR SWINGS AND OPERATIONAL CHECK COMPLIED WITH. AIRCRAFT RELEASED FOR OCF.
RIGHT ENGINE FIRE ANNUNCIATOR ILLUMINATED IN FLIGHT. FOLLOWED CHECKLIST AND LIGHT EXTINGUISHED. EMERGENCY DECLARED AND DIVERTED TO KDAL. MAINTENANCE REPLACED 4 DEFECTIVE BLEED AIR WIGGINS CLAMPS. DURING ENGINE RUNUP AND OPERATIONAL CHECK NOTED RIGHT ENGINE ITT FLUCTUATING BETWEEN 660*-685*. ENGINE FAULT CODES DOWNLOADED AND SENT FOR EVALUATION. DETERMINED ENGINE HAD AN ITT EXCEEDANCE OCCURRENCE AND REQUESTED TO REMOVE THE ENGINE FOR REPAIRS. RIGHT ENGINE WAS REPLACED. AIRCRAFT WAS RETURNED TO SERVICE.
AIRCRAFT HAD TO BE REPOSITIONED POST MAINTENANCE FOR FUELING. WHEN CHOCKS WERE PULLED AIRCRAFT STARTED MOVING AND WOULD NOT STOP USING NORMAL BRAKING. EMERGENCY BRAKE APPLIED TO STOP AIRCRAFT WITHOUT ANY FURTHER INCIDENT. CIRCUIT BREAKERS FOR POWER BRAKES AND ANTI-SKID CONTROL WERE NOTED TO BE EXTENDED. MAINTENANCE RESET THE CIRCUIT BREAKERS, BLED BRAKES AND SERVICED THE NITROGEN SYSTEM. TAXI CHECKS WERE ACCOMPLISHED WITH NO DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE.
DURING PREFLIGHT INSPECTION, THE ACM OVERHEAT ANNUNCIATOR ILLUMINATED WHILE APU WAS RUNNING. E6/E5 FAULT CODE ON TEMPERATURE CONTROLLER. SMOKE IN COCKPIT OBSERVED. MAINTENANCE TROUBLESHOT THE DISCREPANCY TO A FAULTY RIGHT COCKPIT TEMPERATURE CONTROL VALVE. INSPECTED DUCTS AND WIGGINS CLAMPS FOR LEAKS. NONE NOTED. OPERATIONAL CHECKS COMPLIED WITH. AIRCRAFT WAS RETURNED TO SERVICE.
AIRCRAFT HAS BAD VIBRATION THROUGH YOKE & RUDDER PEDALS. VIBRATION GETS MUCH WORSE WITH INCREASE IN AIRSPEED. POWER SETTINGS MODE MADE NO DIFFERENCE. TROUBLE SHOT THE DISCREPANCY TO A DEFECTIVE RUDDER LOWER TRIM TAB HINGE PIN THAT BACKED OUT CAUSING THE VIBRATION IN FLIGHT. RUDDER ASSEMBLY WAS REPLACED DUE TO DAMAGE CAUSED TO HINGE FROM VIBRATION. A SUCCESSFUL OPERATIONAL CHECK FLIGHT WAS PERFORMED. ACFT WAS RETURNED TO SERVICE.
AFTER TAKEOFF THE FLAPS WOULD NOT RETRACT TO 0*. DURING FLIGHT ALL OTHER HYD SYS WORKED. ACFT DIVERTED BACK & AFTER LANDING THE FLAPS WOULD NOT RETRACT TO 0*. ON POST FLIGHT NOTICED FLAP STUCK IN 7* POSITION. ACFT WAS INSPECTED & FERRIED WITH THE FLAPS AT 7* TO THE SERVICE CENTER FOR MX. ACFT IS CURRENTLY IN MX.
ON CLIMB OUT, WHEN FLAPS WERE SELECTED UP THE STAB MISCOMPARE & HYD PRESS ANNUNCIATOR LIGHTS REMAINED ILLUMINATED. CREW COMPLETED THE STAB MISCOMPARE LIGHT ON ABNORMAL CHECKLIST & DIVERTED BACK. DURING THE RETURN & COMPLETING THE CHECKLIST THE HYD PRESS & GEAR UNLOCK ANNUNCIATOR LIGHTS CAME ON. AFTER PLACING GEAR HANDLE IN THE DOWN POSITION HYD PRESS LIGHT WENT OUT & ALL THREE GREEN LG ANNUNCIATOR LIGHTS ILLUMINATED. ACFT LANDING WAS UNEVENTFUL. TROUBLE SHOT THE DISCREPANCY & FOUND THE LT & RT MLG ACTUATORS DEFECTIVE FROM PREVIOUS REPLACEMENT. BOTH ACTUATORS WERE REPLACED. GEAR SWINGS & STABILIZER OPERATIONAL CHECKS WERE PERFORMED WITH NO DEFECTS NOTED. ACFT WAS RETURNED TO SERVICE.