B757 Undifferentiated or Other Model
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 152.7; Flight Crew Total 13072.00; Flight Crew Type 7036.80
Aircraft Equipment Problem Less Severe
Air Traffic Control Issued New Clearance; Flight Crew Diverted; Flight Crew Landed As Precaution; Flight Crew Requested ATC Assistance / Clarification
Aircraft
At FL390 [we] had a right engine bleed trip. Followed QRH and elected to descend; cabin began climbing and we had a subsequent auto pressurization controller failure. Followed QRH; but could not control cabin pressure. Got further descent from ATC. When we determined we were still unable to control the cabin pressure rising I donned the mask and followed QRH procedures. Made uneventful landing in [an alternate airport]. No passenger masks were deployed.
At FL390; received EICAS message for R Eng Bleed Off. We ran the QRH to completion. We soon got a Cabin Auto INOP EICAS and saw that the cabin altitude was climbing. We then ran that QRH procedure as well and were unsuccessful to regain control of the cabin rate of climb. Both pilots also had donned their O2 masks but the passenger O2 masks never deployed as cabin altitude did not exceed limits. During this time; a descent was initiated to a lower altitude; and a diversion to [an alternate airport] was elected. The flight concluded with a normal approach and landing.
B757 flight crew reported diverting to an alternate airport after loss of cabin pressure.