B767 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 8558; Flight Crew Type 2288
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural MEL / CDL; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem
Procedure; Aircraft; Human Factors
This airplane had a problem with the center hydraulic demand pump which led to the deferral of the HMG (Hydraulic Motor Generator). There were 3 circuit breakers that needed to be pulled and safetied; as well as physically disabling the HMG in the wheel well. This was not accomplished by maintenance even though the [maintenance documentation] indicated that it was. While dealing with the additional problems of the nose wheel strut being completely compressed; and a 40;000 pound weight penalty; I neglected to double check the safetied cockpit circuit breakers. During cruise flight we noticed that the 3 CBs were not pulled; notified maintenance and pulled them with [Maintenance] concurrence; wrapping a sticker around each. The flight attendants complained of a loud whining sound between rows 27 and 30. I went back to check. The sound was mechanical; like a pump (indeed the HMG had never been disabled). On approach I called for flaps one; allowing extra time for gear and flap extension. EICAS message flaps asymmetry appeared. The first officer and relief pilot began the checklist. I called for gear down. It took a long time and then we only had that main gear and not the nose gear. Performed a go-around and [advised ATC]. In addition to having the center hydraulic system light illuminated; both center hydraulic pump lights illuminated. Finally the nose gear came down and we had 3 green gear indications. The first officer and relief pilot performed the leading edge flaps checklist and we landed flaps 20 without incident.
[Report narrative contained no additional information.]
B767 flight crew reported difficulty extending the landing gear and flaps related to an improperly handled hydraulic pump deferral at an international station.