Incident at EDMONTON INTL AB (CYEG)
2001-02-26: UPDATE TSB reported that CDN 7122 was enroute from Edmonton (CYEG) to Yellowknife when the No. 2 ¿B¿ hydraulic pump over-heat indication illuminated. The pump was turned off. About 30 seconds later, the No. 1 ¿B¿ low pressure indication illuminated. This pump was turned off. The system quantity dropped to 1.2 gallons. The crew elected to return to Edmonton (CYEG). The cabin crew were briefed to anticipate an abnormal landing. The airport ERS was placed on standby. The aircraft landed and stopped on the runway, where it was inspected by ERS personnel. No abnormalities were noted, and the aircraft was taxied to the ramp. Company maintenance serviced and pressurized the ¿B¿ system and found a steady hydraulic fluid drip from the ¿B¿ system aileron power control unit (PCU) output shaft. It was suspected that a seal rolled in the PCU, resulting in ¿B¿ system fluid loss in flight. The ¿B¿ pump case drain filters inspected with no contamination found. New filters were installed. The company will submit an SDR.
2001-02-19: CDN 7122, a B737, had left Edmonton for Yellowknife about 20 minutes prior when the crew advised Edmonton ACC they had lost one of the two hydraulic systems and needed to return to Edmonton (the aircraft was about 20 NM north of Slave Lake at the time). The crew received a new clearance back to Edmonton and at their request, the emergency vehicles were called out. They did not declare an emergency and no other aircraft were affected. The aircraft was brought straight in for Runway 20 and landed safely at 0515Z. TSB will be contacting the company.
|Occurred At||- 04:45|
|Day or Night?|
|TSB Occurrence Number|
|TSB Class of Investigation|
Aircraft Details (1 aircraft)
|Canadian Registration||| Flightaware (Registration) | Flightaware (Tracking) | AvHerald|
|Country of Registration|
|Phase of Flight|