B767 crew had a malfunctioning pack. During troubleshooting, the crew had a cabin altitude warning horn and the flight attendant deployed the passenger emergency oxygen masks.

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Attributes
ACN	568626
Time
Date	200212
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl bound lower : 668 msl bound upper : 27000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau.artcc tracon : c90.tracon tower : ord.tower
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial climbout : intermediate altitude climbout : takeoff ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 98 flight time total : 11000 flight time type : 98
ASRS Report	568626
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : eicas, cabin high alt warning other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist controller : issued new clearance flight crew : diverted to another airport flight crew : declared emergency flight crew : landed in emergency condition other
Consequence	other other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance Company
Primary Problem	Aircraft

Narrative:

On takeoff roll, the left pack started to cycle on and off starting about 80 KTS. We continued the takeoff and the pack continued to cycle every few seconds. We shut the pack off at about 3000 ft to keep from getting the EICAS message each time it cycled. We continued the climb with the captain flying and looked for the checklist after we were climbing out of 7000 ft. We ran the checklist for both the left pack off light and the left engine bleed light. Neither one fixed the problem. The captain continued to fly and I contacted dispatch and we patched to air carrier maintenance controller. He had me run the same checklist and then he gave me 5 circuit breakers to pull and reset. We were then at FL270 and the altitude warning horn went off and the cabin altitude showed 10000-11000 ft. The captain declared an emergency and we started a descent. The left pack started to work again, we ran the rapid depressurization qrc and by FL190 we had the cabin altitude back down and under control. We leveled at FL190 and the captain gave the aircraft to me and he talked to dispatch. Oxygen masks in back were manually deployed by the flight attendant at the captain's order during the descent. We returned to ord and continued to have some problems with the cabin pressure. With a flight idle descent out of 17000 ft, both packs on the cabin climb at 400 FPM.

Original NASA ASRS Text

Title: B767 CREW HAD A MALFUNCTIONING PACK. DURING TROUBLESHOOTING, THE CREW HAD A CABIN ALT WARNING HORN AND THE FLT ATTENDANT DEPLOYED THE PAX EMER OXYGEN MASKS.

Narrative: ON TKOF ROLL, THE L PACK STARTED TO CYCLE ON AND OFF STARTING ABOUT 80 KTS. WE CONTINUED THE TKOF AND THE PACK CONTINUED TO CYCLE EVERY FEW SECONDS. WE SHUT THE PACK OFF AT ABOUT 3000 FT TO KEEP FROM GETTING THE EICAS MESSAGE EACH TIME IT CYCLED. WE CONTINUED THE CLB WITH THE CAPT FLYING AND LOOKED FOR THE CHKLIST AFTER WE WERE CLBING OUT OF 7000 FT. WE RAN THE CHKLIST FOR BOTH THE L PACK OFF LIGHT AND THE L ENG BLEED LIGHT. NEITHER ONE FIXED THE PROB. THE CAPT CONTINUED TO FLY AND I CONTACTED DISPATCH AND WE PATCHED TO ACR MAINT CTLR. HE HAD ME RUN THE SAME CHKLIST AND THEN HE GAVE ME 5 CIRCUIT BREAKERS TO PULL AND RESET. WE WERE THEN AT FL270 AND THE ALT WARNING HORN WENT OFF AND THE CABIN ALT SHOWED 10000-11000 FT. THE CAPT DECLARED AN EMER AND WE STARTED A DSCNT. THE L PACK STARTED TO WORK AGAIN, WE RAN THE RAPID DEPRESSURIZATION QRC AND BY FL190 WE HAD THE CABIN ALT BACK DOWN AND UNDER CTL. WE LEVELED AT FL190 AND THE CAPT GAVE THE ACFT TO ME AND HE TALKED TO DISPATCH. OXYGEN MASKS IN BACK WERE MANUALLY DEPLOYED BY THE FLT ATTENDANT AT THE CAPT'S ORDER DURING THE DSCNT. WE RETURNED TO ORD AND CONTINUED TO HAVE SOME PROBS WITH THE CABIN PRESSURE. WITH A FLT IDLE DSCNT OUT OF 17000 FT, BOTH PACKS ON THE CABIN CLB AT 400 FPM.

Data retrieved from NASA's ASRS site as of July 2007 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.