An air carrier flight crew flying DC9-30 from lnk felt pressure bump after takeoff with the bag door...

Attributes
ACN	433977
Time
Date	199904
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lnk.airport
State Reference	NE
Altitude	msl bound lower : 800 msl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lnk.tower
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 5000
ASRS Report	433977
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical non adherence : company policies non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : provided flight assist flight crew : landed as precaution
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Company
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Completed my preflight duties and checklists. I was PNF so I read checklist. Climbing out through about 800-1000 ft AGL, felt a pressurization bump. Looked up to see cabin climb rate increasing between 1000-1500 FPM and aft cargo door light on. Cabin had about 1 1/2 inches of differential pressure and initially we thought we could control pressurization with rate knob. Quickly determined that was not going to be possible. Captain decided to return to lincoln. On landing, saw a piece of luggage on the runway. Told tower about the bag and taxied to the gate. Ground personnel, who had loaded the baggage, plugged in and it was determined that the aft cargo door was open and was now closed. We confirmed that the light had gone out. Airport personnel retrieved the bag from the runway and confirmed it was from our aircraft. They loaded the bag and we again confirmed that the door was closed and we checked the light out again. I asked the captain if he wanted to make sure everything was ok in the aft cargo bin, had we lost anymore bags, etc? He questioned the agent on the ground and was told everything looked normal in the aft cargo bin. We refueled and departed. Captain responded 'out' to 'door lights' on after start checklist and said light was out after 'before takeoff checklist.' I glanced at the light panel as we took the runway and believe all lights were out. Additionally there was a wing walker on the right side of the aircraft (same as cargo door) as we taxied out because of the closeness of the adjacent jetway. If the door was open we all missed it. Perhaps it was a sticky switch that didn't give us a light. Can't explain why we got the pressurization bump. We had started early, XA36 report time (the captain's was even earlier). This was the 4TH leg for me, the 5TH for the captain. If the light was on and we missed it, we may have been a little tired. Don't know why ground personnel didn't get the door closed. Don't think the door could open in-flight. Day 2 of trip for me, day 4 for captain.

Original NASA ASRS Text

Title: AN ACR FLC FLYING DC9-30 FROM LNK FELT PRESSURE BUMP AFTER TKOF WITH THE BAG DOOR LIGHT ILLUMINATED.

Narrative: COMPLETED MY PREFLT DUTIES AND CHKLISTS. I WAS PNF SO I READ CHKLIST. CLBING OUT THROUGH ABOUT 800-1000 FT AGL, FELT A PRESSURIZATION BUMP. LOOKED UP TO SEE CABIN CLB RATE INCREASING BTWN 1000-1500 FPM AND AFT CARGO DOOR LIGHT ON. CABIN HAD ABOUT 1 1/2 INCHES OF DIFFERENTIAL PRESSURE AND INITIALLY WE THOUGHT WE COULD CTL PRESSURIZATION WITH RATE KNOB. QUICKLY DETERMINED THAT WAS NOT GOING TO BE POSSIBLE. CAPT DECIDED TO RETURN TO LINCOLN. ON LNDG, SAW A PIECE OF LUGGAGE ON THE RWY. TOLD TWR ABOUT THE BAG AND TAXIED TO THE GATE. GND PERSONNEL, WHO HAD LOADED THE BAGGAGE, PLUGGED IN AND IT WAS DETERMINED THAT THE AFT CARGO DOOR WAS OPEN AND WAS NOW CLOSED. WE CONFIRMED THAT THE LIGHT HAD GONE OUT. ARPT PERSONNEL RETRIEVED THE BAG FROM THE RWY AND CONFIRMED IT WAS FROM OUR ACFT. THEY LOADED THE BAG AND WE AGAIN CONFIRMED THAT THE DOOR WAS CLOSED AND WE CHKED THE LIGHT OUT AGAIN. I ASKED THE CAPT IF HE WANTED TO MAKE SURE EVERYTHING WAS OK IN THE AFT CARGO BIN, HAD WE LOST ANYMORE BAGS, ETC? HE QUESTIONED THE AGENT ON THE GND AND WAS TOLD EVERYTHING LOOKED NORMAL IN THE AFT CARGO BIN. WE REFUELED AND DEPARTED. CAPT RESPONDED 'OUT' TO 'DOOR LIGHTS' ON AFTER START CHKLIST AND SAID LIGHT WAS OUT AFTER 'BEFORE TKOF CHKLIST.' I GLANCED AT THE LIGHT PANEL AS WE TOOK THE RWY AND BELIEVE ALL LIGHTS WERE OUT. ADDITIONALLY THERE WAS A WING WALKER ON THE R SIDE OF THE ACFT (SAME AS CARGO DOOR) AS WE TAXIED OUT BECAUSE OF THE CLOSENESS OF THE ADJACENT JETWAY. IF THE DOOR WAS OPEN WE ALL MISSED IT. PERHAPS IT WAS A STICKY SWITCH THAT DIDN'T GIVE US A LIGHT. CAN'T EXPLAIN WHY WE GOT THE PRESSURIZATION BUMP. WE HAD STARTED EARLY, XA36 RPT TIME (THE CAPT'S WAS EVEN EARLIER). THIS WAS THE 4TH LEG FOR ME, THE 5TH FOR THE CAPT. IF THE LIGHT WAS ON AND WE MISSED IT, WE MAY HAVE BEEN A LITTLE TIRED. DON'T KNOW WHY GND PERSONNEL DIDN'T GET THE DOOR CLOSED. DON'T THINK THE DOOR COULD OPEN INFLT. DAY 2 OF TRIP FOR ME, DAY 4 FOR CAPT.

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.

An air carrier flight crew flying DC9-30 from lnk felt pressure bump after takeoff with the bag door light illuminated.