Air carrier medium large transport aircraft lost pressurization after takeoff and returned to land.

Attributes
ACN	214495
Time
Date	199207
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : rdu
State Reference	NC
Altitude	agl bound lower : 20 agl bound upper : 1500
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	tracon : rdu
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 95 flight time total : 16406 flight time type : 2250
ASRS Report	214495
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Prior to pushback at rdu airport the exterior and interior duties were completed and the door lights checked on the annunciator panel. Upon departing rdu, shortly after rotation and during climb out a loud air leak noise was emanating from below the floor boards, and the aircraft would not pressurize. Both air conditioning systems were on and the door lights on the annunciator panel were checked again and found to indicate all doors were closed. Manual pressurization was tried with no better results. I elected to return to rdu and have the problem investigated. The east and east compartment door was found open. The cannon plug to the switch on the east and east compartment door was also found to be disconnected. It is unknown at what time the east and east door came open after the exterior preflight or how the cannon plug became disconnected. The annunciator test for door lights checks only the bulb and not the continuity of the system.

Original NASA ASRS Text

Title: ACR MLG ACFT LOST PRESSURIZATION AFTER TKOF AND RETURNED TO LAND.

Narrative: PRIOR TO PUSHBACK AT RDU ARPT THE EXTERIOR AND INTERIOR DUTIES WERE COMPLETED AND THE DOOR LIGHTS CHKED ON THE ANNUNCIATOR PANEL. UPON DEPARTING RDU, SHORTLY AFTER ROTATION AND DURING CLB OUT A LOUD AIR LEAK NOISE WAS EMANATING FROM BELOW THE FLOOR BOARDS, AND THE ACFT WOULD NOT PRESSURIZE. BOTH AIR CONDITIONING SYSTEMS WERE ON AND THE DOOR LIGHTS ON THE ANNUNCIATOR PANEL WERE CHKED AGAIN AND FOUND TO INDICATE ALL DOORS WERE CLOSED. MANUAL PRESSURIZATION WAS TRIED WITH NO BETTER RESULTS. I ELECTED TO RETURN TO RDU AND HAVE THE PROBLEM INVESTIGATED. THE E AND E COMPARTMENT DOOR WAS FOUND OPEN. THE CANNON PLUG TO THE SWITCH ON THE E AND E COMPARTMENT DOOR WAS ALSO FOUND TO BE DISCONNECTED. IT IS UNKNOWN AT WHAT TIME THE E AND E DOOR CAME OPEN AFTER THE EXTERIOR PREFLT OR HOW THE CANNON PLUG BECAME DISCONNECTED. THE ANNUNCIATOR TEST FOR DOOR LIGHTS CHKS ONLY THE BULB AND NOT THE CONTINUITY OF THE SYS.

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.