B767 flight crew declare emergency and make overweight landing at ord due to cabin pressurization fa...

Attributes
ACN	568497
Time
Date	200212
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : c90.tracon
State Reference	IL
Altitude	msl single value : 28000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : c90.tracon
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 : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 16000 flight time type : 2693
ASRS Report	568497
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : cabin alt warning other flight crewa
Resolutory Action	flight crew : overrode automation flight crew : landed in emergency condition flight crew : declared emergency other
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Left pack off EICAS during takeoff roll, followed by duct pressure surging and cabin altitude rate off climb fluctuating between 300-1000 FPM. Irregular procedures checks were completed and a call was placed to maintenance and dispatch. Maintenance suggested pulling several circuit breakers on the P6-11 panel. After attempting reset of the pack, continued to malfunction as before when selected on. We failed to notice the cabin altitude had reached 10000 ft and the cabin altitude warning came on. We donned oxygen masks and I declared an emergency and requested a descent. When the cabin altitude descended below 10000 ft, we removed our masks and requested a clearance to ord. An overweight landing was made on runway 27L. The aircraft weight at touchdown was 204500 pounds.

Original NASA ASRS Text

Title: B767 FLC DECLARE EMER AND MAKE OVERWT LNDG AT ORD DUE TO CABIN PRESSURIZATION FAILURE.

Narrative: L PACK OFF EICAS DURING TKOF ROLL, FOLLOWED BY DUCT PRESSURE SURGING AND CABIN ALT RATE OFF CLB FLUCTUATING BTWN 300-1000 FPM. IRREGULAR PROCS CHKS WERE COMPLETED AND A CALL WAS PLACED TO MAINT AND DISPATCH. MAINT SUGGESTED PULLING SEVERAL CIRCUIT BREAKERS ON THE P6-11 PANEL. AFTER ATTEMPTING RESET OF THE PACK, CONTINUED TO MALFUNCTION AS BEFORE WHEN SELECTED ON. WE FAILED TO NOTICE THE CABIN ALT HAD REACHED 10000 FT AND THE CABIN ALT WARNING CAME ON. WE DONNED OXYGEN MASKS AND I DECLARED AN EMER AND REQUESTED A DSCNT. WHEN THE CABIN ALT DSNDED BELOW 10000 FT, WE REMOVED OUR MASKS AND REQUESTED A CLRNC TO ORD. AN OVERWT LNDG WAS MADE ON RWY 27L. THE ACFT WT AT TOUCHDOWN WAS 204500 LBS.

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.

B767 flight crew declare emergency and make overweight landing at ord due to cabin pressurization failure.