<< >> NASA ASRS Report 622230, April 2003

After cabin pressure went above 10000 ft, the flight crew of a B737 descended to lower altitude where the cabin pressure was restored in manual mode while on frequency with ZME, tn.

Attributes
ACN	622230
Time
Date	200304
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zme.artcc
State Reference	TN
Altitude	msl bound lower : 21000 msl bound upper : 29000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level cruise : enroute altitude change descent : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 209 flight time total : 5830 flight time type : 3330
ASRS Report	622230
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical cabin event other non adherence : published procedure non adherence : company policies non adherence : far other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : confign horn - cab alt gage other flight crewa other flight crewb
Resolutory Action	flight crew : overrode automation flight crew : overcame equipment problem other
Consequence	other other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

Flight was in cruise at FL290 approximately 30 mins into flight when the confign warning horn sounded. Verified that confign was normal and pressurization was normal. Captain disconnected and re-engaged the autoplt while I located the aural warning circuit breaker (not pulled). Rechked pressurization and now noted cabin pressure above 10000 ft and climbing, followed quickly by automatic fail and standby lights and passenger oxygen light. Accomplished QRH checklist, attempting standby mode and then manual mode, to stabilize cabin pressure while descending to FL210. No emergency declared and continued to bna. Flight attendants verified oxygen masks had dropped, passenger were advised situation was stabilized.

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Original NASA ASRS Text

Title: AFTER CABIN PRESSURE WENT ABOVE 10000 FT, THE FLT CREW OF A B737 DSNDED TO LOWER ALT WHERE THE CABIN PRESSURE WAS RESTORED IN MANUAL MODE WHILE ON FREQ WITH ZME, TN.

Narrative: FLT WAS IN CRUISE AT FL290 APPROX 30 MINS INTO FLT WHEN THE CONFIGN WARNING HORN SOUNDED. VERIFIED THAT CONFIGN WAS NORMAL AND PRESSURIZATION WAS NORMAL. CAPT DISCONNECTED AND RE-ENGAGED THE AUTOPLT WHILE I LOCATED THE AURAL WARNING CIRCUIT BREAKER (NOT PULLED). RECHKED PRESSURIZATION AND NOW NOTED CABIN PRESSURE ABOVE 10000 FT AND CLBING, FOLLOWED QUICKLY BY AUTO FAIL AND STANDBY LIGHTS AND PAX OXYGEN LIGHT. ACCOMPLISHED QRH CHKLIST, ATTEMPTING STANDBY MODE AND THEN MANUAL MODE, TO STABILIZE CABIN PRESSURE WHILE DSNDING TO FL210. NO EMER DECLARED AND CONTINUED TO BNA. FLT ATTENDANTS VERIFIED OXYGEN MASKS HAD DROPPED, PAX WERE ADVISED SIT WAS STABILIZED.

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.