<< >> NASA ASRS Report 742979, June 2007

B737-300 would not pressurize after takeoff. Flight crew declared emergency and returned to departure airport for overweight landing.

Attributes
ACN	742979
Time
Date	200706
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	742979
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	742445
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport flight crew : landed as precaution
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Equipment door opened on takeoff. No equipment light indication. Aircraft would not pressurize. Returned for overweight landing (120000 pounds) and declared emergency per fom. Aircraft would not pressurize on takeoff. No abnormal indications (equipment; cargo door lights). Tried manual AC setting and manually closed outflow valve; no help. Discussed our options and returned for landing. Declared emergency due to overweight landing (120000 pounds) per company procedures. Made logbook entries for pressurization problem; failure of equipment door light to illuminate; and overweight landing. Aircraft would not pressurize. Aircraft came out of maintenance -- first flight since maintenance. Equipment light tested ok; malfunction -- did not indicate equipment door not secured. Furthermore; on my walkaround; all doors appeared closed. After returning maintenance said 'found a broken wire in the east&east compartment that caused this to occur.'

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Original NASA ASRS Text

Title: B737-300 WOULD NOT PRESSURIZE AFTER TKOF. FLT CREW DECLARED EMER AND RETURNED TO DEP ARPT FOR OVERWEIGHT LNDG.

Narrative: EQUIP DOOR OPENED ON TKOF. NO EQUIP LIGHT INDICATION. ACFT WOULD NOT PRESSURIZE. RETURNED FOR OVERWT LNDG (120000 LBS) AND DECLARED EMER PER FOM. ACFT WOULD NOT PRESSURIZE ON TKOF. NO ABNORMAL INDICATIONS (EQUIP; CARGO DOOR LIGHTS). TRIED MANUAL AC SETTING AND MANUALLY CLOSED OUTFLOW VALVE; NO HELP. DISCUSSED OUR OPTIONS AND RETURNED FOR LNDG. DECLARED EMER DUE TO OVERWT LNDG (120000 LBS) PER COMPANY PROCS. MADE LOGBOOK ENTRIES FOR PRESSURIZATION PROB; FAILURE OF EQUIP DOOR LIGHT TO ILLUMINATE; AND OVERWT LNDG. ACFT WOULD NOT PRESSURIZE. ACFT CAME OUT OF MAINT -- FIRST FLT SINCE MAINT. EQUIP LIGHT TESTED OK; MALFUNCTION -- DID NOT INDICATE EQUIP DOOR NOT SECURED. FURTHERMORE; ON MY WALKAROUND; ALL DOORS APPEARED CLOSED. AFTER RETURNING MAINT SAID 'FOUND A BROKEN WIRE IN THE E&E COMPARTMENT THAT CAUSED THIS TO OCCUR.'

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.