A B757-200 captain reported left engine high stage bleed EICAS received. The flight crew found the p...

Narrative:

On take off roll the left engine high stage bleed came on; also EICAS message. At a safe altitude the engine high stage checklist was accomplished. Climb to FL340; then called [maintenance and] dispatch. I confirmed checklist was confusing. [Maintenance] then checked with [operations duty manager]. An hour later [maintenance] came back; said [operations duty manager] said to do what the checklist says. Now we are in a single bleed operation over mountainous terrain! We decided; with the terrain analysis and no other routing options; not to continue over mountainous terrain in this state. An overweight landing was made at [a suitable alternate]. Emergency was declared; taxied to the gate uneventfully. Changed AC and continued.

Original NASA ASRS Text

Title: A B757-200 Captain reported L ENG HIGH STAGE BLEED EICAS received. The flight crew found the procedure confusing; Operations and Maintenance were of little help; so they declared an emergency and diverted to a suitable airport.

Narrative: On Take Off roll the left engine High Stage Bleed came on; also EICAS message. At a safe altitude the Engine High Stage checklist was accomplished. Climb to FL340; then called [Maintenance and] Dispatch. I confirmed checklist was confusing. [Maintenance] then checked with [Operations Duty Manager]. An hour later [Maintenance] came back; said [Operations Duty Manager] said to do what the checklist says. Now we are in a single bleed operation over mountainous terrain! We decided; with the terrain analysis and no other routing options; not to continue over mountainous terrain in this state. An overweight landing was made at [a suitable alternate]. Emergency was declared; taxied to the gate uneventfully. Changed AC and continued.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	976744
Time
Date	201110
Local Time Of Day	0601-1200
Place
Locale Reference	ZAU.ARTCC
State Reference	IL
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Plan	IFR
Component
Aircraft Component	Pneumatic Control Valves
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 250 Flight Crew Total 33000 Flight Crew Type 13000
Events
Anomaly	Aircraft Equipment Problem Less Severe

A B757-200 captain reported left engine high stage bleed EICAS received. The flight crew found the procedure confusing; operations and maintenance were of little help; so they declared an emergency and diverted to a suitable airport.