<< >> NASA ASRS Report 482808, August 2000

A B737-200 on second takeoff attempt again had aft cargo door warning with pressurization problems. Declared an emergency and returned to the field.

Attributes
ACN	482808
Time
Date	200008
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : takeoff
Route In Use	departure : other published ifr departure
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 4100 flight time type : 800
ASRS Report	482808
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cargo door warning other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

On takeoff roll in ZZZ at approximately 20 KTS, we got a master caution/aft cargo light. Aborted takeoff and cleared the runway. Light was now out. Executed the door light QRH checklist and applicable fom sections. Because aircraft was pressurized normally, captain elected to continue without returning to the gate. During our second takeoff roll, we got a master caution/aft cargo light at approximately 100 KIAS. Continued the takeoff and once airborne, noticed the aft not pressurizing normally. Decided to return to the field, declared an emergency because of our overweight condition and had an uneventful landing. Once clear of the runway during the after landing check, we both noticed the light was again out. Proceeded back to our gate and wrote up that maintenance indicated that it was possibly a faulty microswitch and/or stuck outflow valve.

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Original NASA ASRS Text

Title: A B737-200 ON SECOND TKOF ATTEMPT AGAIN HAD AFT CARGO DOOR WARNING WITH PRESSURIZATION PROBS. DECLARED AN EMER AND RETURNED TO THE FIELD.

Narrative: ON TKOF ROLL IN ZZZ AT APPROX 20 KTS, WE GOT A MASTER CAUTION/AFT CARGO LIGHT. ABORTED TKOF AND CLRED THE RWY. LIGHT WAS NOW OUT. EXECUTED THE DOOR LIGHT QRH CHKLIST AND APPLICABLE FOM SECTIONS. BECAUSE ACFT WAS PRESSURIZED NORMALLY, CAPT ELECTED TO CONTINUE WITHOUT RETURNING TO THE GATE. DURING OUR SECOND TKOF ROLL, WE GOT A MASTER CAUTION/AFT CARGO LIGHT AT APPROX 100 KIAS. CONTINUED THE TKOF AND ONCE AIRBORNE, NOTICED THE AFT NOT PRESSURIZING NORMALLY. DECIDED TO RETURN TO THE FIELD, DECLARED AN EMER BECAUSE OF OUR OVERWT CONDITION AND HAD AN UNEVENTFUL LNDG. ONCE CLR OF THE RWY DURING THE AFTER LNDG CHK, WE BOTH NOTICED THE LIGHT WAS AGAIN OUT. PROCEEDED BACK TO OUR GATE AND WROTE UP THAT MAINT INDICATED THAT IT WAS POSSIBLY A FAULTY MICROSWITCH AND/OR STUCK OUTFLOW VALVE.

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.