B757 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 400; Flight Crew Total 20000; Flight Crew Type 10000
Time Pressure; Workload; Troubleshooting
Aircraft Equipment Problem Critical
Flight Crew Diverted; Flight Crew Took Evasive Action; Flight Crew FLC complied w / Automation / Advisory; General Declared Emergency
Aircraft
On takeoff roll around 100 KTS; received a caution Left High stage bleed; we did not abort; continued with the takeoff. Around 10;000 FT took out the QRH; went to the procedure; which asked us to close the left bleed valve; thereby single pack operation. Informed Dispatch and Maintenance. Confirmed no limitations on single pack. Two minutes later got Red Warning and Aural light for Cabin Altitude. Apparently this single pack was unable to maintain cabin altitude. We contacted Center and started an initial descent to 30;000 FT; 19;000 FT; 14;000 FT; 12;000 FT; [and] 13;000 FT. We told flight attendants that we will be landing at a divert airport in 35-40 minutes. Dispatch 'call me' did not function. Sent a Dispatch Message. After a little while got a hold of them on commercial radio and a phone patch with Maintenance was established. Best course of action was to divert. We declared an emergency; had jumpseater come to cockpit; kept passengers informed. Uneventful. First Officer made the landing.
The deadheading crew member help regulate the pressurization by using the manual control.
A B757 EICAS alerted L HI STAGE BLEED during takeoff so the QRH was completed and the crew continued to FL370 single pack where the aural and light CABIN ALT WARNING alerted. An emergency was declared and the flight descended to a divert airport.