A B757-200 recirculation fan tripped off followed by both packs tripping. Emergency declared; emerge...

Attributes
ACN	648583
Time
Date	200502
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : holma
State Reference	FO
Altitude	msl single value : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : txkf.artcc tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	648583
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : eicas other flight crewa
Resolutory Action	controller : issued new clearance flight crew : diverted to another airport flight crew : landed as precaution flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

In cruise at FL350 the right recirculation fan tripped off. We accomplished the checklist and continued with the fan off. About 40 mins later; the right pack tripped off for high temperature. We started the checklist when about 1 min later the left pack tripped off. The cabin altitude started a slow climb. We donned our oxygen masks and contacted new york comrdo declaring an emergency requesting an immediate descent. I made a PA explaining that we were having a problem with the pressurization system and that we might have to deploy their oxygen masks. I requested that they follow the flight attendant's instructions. I also talked to the purser explaining the situation. I continued to monitor the cabin altitude when it approached 10000 ft. I reset the right pack. The cabin then started to descend. After leveling at 14000 ft; the left pack was reset successfully. When we were sure everything was stable; we climbed to FL240 and diverted to san juan. In retrospect; I feel that to have been in total compliance with the red box items; I should have deployed the passenger oxygen.

Original NASA ASRS Text

Title: A B757-200 RECIRCULATION FAN TRIPPED OFF FOLLOWED BY BOTH PACKS TRIPPING. EMER DECLARED; EMER DSCNT COMPLETED AND DIVERSION TO AN ALTERNATE ARPT.

Narrative: IN CRUISE AT FL350 THE R RECIRCULATION FAN TRIPPED OFF. WE ACCOMPLISHED THE CHKLIST AND CONTINUED WITH THE FAN OFF. ABOUT 40 MINS LATER; THE R PACK TRIPPED OFF FOR HIGH TEMP. WE STARTED THE CHKLIST WHEN ABOUT 1 MIN LATER THE L PACK TRIPPED OFF. THE CABIN ALT STARTED A SLOW CLB. WE DONNED OUR OXYGEN MASKS AND CONTACTED NEW YORK COMRDO DECLARING AN EMER REQUESTING AN IMMEDIATE DSCNT. I MADE A PA EXPLAINING THAT WE WERE HAVING A PROB WITH THE PRESSURIZATION SYS AND THAT WE MIGHT HAVE TO DEPLOY THEIR OXYGEN MASKS. I REQUESTED THAT THEY FOLLOW THE FLT ATTENDANT'S INSTRUCTIONS. I ALSO TALKED TO THE PURSER EXPLAINING THE SIT. I CONTINUED TO MONITOR THE CABIN ALT WHEN IT APCHED 10000 FT. I RESET THE R PACK. THE CABIN THEN STARTED TO DSND. AFTER LEVELING AT 14000 FT; THE L PACK WAS RESET SUCCESSFULLY. WHEN WE WERE SURE EVERYTHING WAS STABLE; WE CLBED TO FL240 AND DIVERTED TO SAN JUAN. IN RETROSPECT; I FEEL THAT TO HAVE BEEN IN TOTAL COMPLIANCE WITH THE RED BOX ITEMS; I SHOULD HAVE DEPLOYED THE PAX OXYGEN.

Data retrieved from NASA's ASRS site as of January 2009 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.

A B757-200 recirculation fan tripped off followed by both packs tripping. Emergency declared; emergency descent completed and diversion to an alternate airport.