B757 first officer reported losing cabin pressure when both pneumatic bleeds failed at FL350.

Attributes
ACN	1216449
Time
Date	201411
Local Time Of Day	0001-0600
Place
Locale Reference	ZTL.ARTCC
State Reference	GA
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Pneumatic Control Valves
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Engineer Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 250 Flight Crew Total 7000 Flight Crew Type 2000
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Climbing to cruise altitude right bleed EICAS message followed by a left bleed EICAS message. Resulting in loss of both packs. Resulting is cabin altitude warning message. We began descent to 10;000 while performing QRH procedures.

Original NASA ASRS Text

Title: B757 First Officer reported losing cabin pressure when both pneumatic bleeds failed at FL350.

Narrative: Climbing to cruise altitude Right Bleed EICAS Message followed by a Left Bleed EICAS message. Resulting in loss of both PACKS. Resulting is CABIN ALT warning message. We began descent to 10;000 while performing QRH procedures.

Data retrieved from NASA's ASRS site 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.