Incident at FORT MCMURRAY AB (CYMM)

Summary

2001-02-05: On a flight from Edmonton City Centre Airport to Yellowknife, the crew of TGO 854, a Cessna Citation, experienced engine problems while passing abeam Peace River. The pilot requested to deviate to Fort McMurray (YMM) to have the engine checked. The crew did not declare an emergency and did not request emergency vehicles meet them at YMM. The aircraft landed safely at 1744Z. There was no impact on ATC operations and no other aircraft were inconvenienced. The a/c remains at YMM while the operator troubleshoots the problem with the assistance of Pratt & Whitney and Cessna.
2001-02-12: UPDATE Aircraft Services reported that the crew advised Transport Canada Aircraft Services Directorate Maintenance Personnel of the engine problem upon their arrival at YMM. They reported that the L/H engine N1 had rolled back to 80% at altitude. The crew selected the ignition to on and the N1 recovered and could be maintained with ignition selected on. Ground run checks were completed at YMM by the crew upon the request of Aircraft Services Directorate Maintenance Personnel and all ground run checks were satisfactory, except that the acceleration check with ignition selected off was slow on the L/H engine. From the results of the runs completed, it was determined that the L/H engine possibly had a restriction or a leak of P3 air to the fuel control unit or at the step modulator. A member of the Edmonton Base Maintenance Personnel was dispatched to CYMM to investigate and the inspection revealed no visible defects or P3 leaks, so it was decided to leave the aircraft in YMM at this point. This problem was discussed with both Cessna Aircraft and Pratt & Whitney Canada and it was agreed that this aircraft could be ferried under a Special Ferry Permit to YXD from YMM providing that N1 takeoff power could be achieved and the ignition remained on during the ferry flight. The takeoff N1 power had been checked during ground runs completed at YMM by the crew on the day of the occurrence and no difficulty had occurred in regards to obtaining takeoff N1. A special ferry permit was issued and the aircraft was ferried back to YXD on February 06/2001 with the ignition selected on during the ferry flight and was uneventful. At the Edmonton Base, the engine was inspected for possible restriction in the P3 line at the fuel control unit and the step modulator and nothing was found. All ground runs revealed no fault and the acceleration checks were normal. The fault could not be duplicated, so the aircraft was released for a test flight to carry out acceleration checks at altitude as called up in the Maintenance Manual, and to check N1 speeds at altitude to check if the fault could be duplicated. The acceleration check as called in the Maintenance Manual was acceptable. The test flight continued to 40,700 feet when the L/H engine N1 did roll back to 80%. Ignition was selected on and the N1 once again did recover as in the original occurrence. The aircraft returned to YXD. Currently the L/H engine fuel control unit, complete with the step modulator are being replaced. The unserviceable fuel control unit and step modulator will be forwarded to Pratt & Whitney for determination of the cause of the fault within the fuel control unit. The L/H engine fuel control unit, complete with the step modulator replacement has now been completed. This replacement was completed February 10/2001 and the aircraft was released for return to service subject to required flight tests as indicated in the maintenance manual. These checks were completed satisfactorily on February 11/2001. In addition to the required checks in the maintenance manual for a fuel control unit replacement, the aircraft was operated to an altitude of 43,000 feet to check N1 fan speeds which was also completed satisfactorily. The aircraft has now been returned to service. An SDR has been completed and submitted

Details


CADORS Number 2001C0108
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2001-02-02 - 17:15
Day or Night? Day-time
Fatalities 0
Injuries
Aerodrome ID CYMM
Aerodrome Name FORT MCMURRAY AB (CYMM)
Geographic Location Alberta, Canada, North America, Prairie and Northern Region, Fort McMurray
TSB Occurrence Number A01W0023
TSB Class of Investigation Class 5
AOR Number 13845
Reported By NAV CANADA
Categories System/component failure or malfunction [powerplant],Other
Events



Aircraft Details (1 aircraft)

Type Aeroplane
 Silhouette image of Aeroplane
Canadian Registration FKCE | Flightaware (Registration) | Flightaware (Tracking) | AvHerald
Foreign Registration
Country of Registration Canada
Occurrence Type Incident
Owner GOVERNMENT OF CANADA, DEPARTMENT OF TRANSPORT
Operator DEPARTMENT OF TRANSPORT AIRCRAFT SERVICES MINISTERE DES TRANSPORTS SERVICES DES AERONEFS (2134) State
Make  Silhouette image of CESSNA
CESSNA
Model 550
Year Built 1991
Engine Type Turbo fan
Engine Make PRATT & WHITNEY-CAN
Engine Model JT15D-4
Gear Type Land
Private No
Amateur Built No
Flight Number TGO 854
Flight Rule
CARS Subpart
Phase of Flight Cruise
Damage No Damage
Fatalities 0
Injuries 0
Events Engine - malfunction,Diversion

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