A CRJ700 was released for service after the aft cargo door seal was replaced. Flight crew experience...

Attributes
ACN	712301
Time
Date	200608
Place
Locale Reference	airport : zzz.airport
State Reference	US
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Regional Jet 700 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	712301
Person 2
Affiliation	company : air carrier
Function	maintenance : lead technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : cabin pressure indications other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : work cards contributing factor : engineering procedure contributing factor : manuals performance deficiency : installation performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : inspection
Supplementary
Problem Areas	Maintenance Human Performance Chart Or Publication Aircraft Environmental Factor
Primary Problem	Chart Or Publication
Situations
Publication	Maint Manual Chap 52

Narrative:

Cargo door seal was installed backwards. I was installing a new cargo door seal and was following the amm up to the follow-up steps. The amm was not clear and the way the seal was labeled was wrong. I was confused so I asked a co-worker. He said he had not replaced the seal before; so I went to my lead tech. He looked at the seal and the amm and we decided to put the seal on opposite of the way it was labeled. The seal was labeled wrong and the amm is not clear and that can confuse a new mechanic like me. The amm does not say improper installation could cause pressurization problems.callback conversation with reporter revealed the following information: the reporter stated the seal was marked incorrectly 'fwd' was 'aft' and 'top' was 'bottom.' the seal was actually installed correctly in the original installation but noting the seal markings; the reporter requested lead technician help. The lead technician and the reporter checked the maintenance manual pictorials and text and found little help. The lead technician advised removing the seal and reinstall using the seal markings as a guide. The seal was removed and installed according with the markings. The next shift made the operational pressurization check and released the airplane for service. First flight the airplane came back with pressurization problems.

Original NASA ASRS Text

Title: A CRJ700 WAS RELEASED FOR SVC AFTER THE AFT CARGO DOOR SEAL WAS REPLACED. FLT CREW EXPERIENCED PRESSURIZATION PROBS. RETURNED TO DEP ARPT. THE DOOR SEAL LABELING WAS ALLEGEDLY REVERSED.

Narrative: CARGO DOOR SEAL WAS INSTALLED BACKWARDS. I WAS INSTALLING A NEW CARGO DOOR SEAL AND WAS FOLLOWING THE AMM UP TO THE FOLLOW-UP STEPS. THE AMM WAS NOT CLEAR AND THE WAY THE SEAL WAS LABELED WAS WRONG. I WAS CONFUSED SO I ASKED A CO-WORKER. HE SAID HE HAD NOT REPLACED THE SEAL BEFORE; SO I WENT TO MY LEAD TECH. HE LOOKED AT THE SEAL AND THE AMM AND WE DECIDED TO PUT THE SEAL ON OPPOSITE OF THE WAY IT WAS LABELED. THE SEAL WAS LABELED WRONG AND THE AMM IS NOT CLEAR AND THAT CAN CONFUSE A NEW MECHANIC LIKE ME. THE AMM DOES NOT SAY IMPROPER INSTALLATION COULD CAUSE PRESSURIZATION PROBS.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE SEAL WAS MARKED INCORRECTLY 'FWD' WAS 'AFT' AND 'TOP' WAS 'BOTTOM.' THE SEAL WAS ACTUALLY INSTALLED CORRECTLY IN THE ORIGINAL INSTALLATION BUT NOTING THE SEAL MARKINGS; THE RPTR REQUESTED LEAD TECHNICIAN HELP. THE LEAD TECHNICIAN AND THE RPTR CHKED THE MAINT MANUAL PICTORIALS AND TEXT AND FOUND LITTLE HELP. THE LEAD TECHNICIAN ADVISED REMOVING THE SEAL AND REINSTALL USING THE SEAL MARKINGS AS A GUIDE. THE SEAL WAS REMOVED AND INSTALLED ACCORDING WITH THE MARKINGS. THE NEXT SHIFT MADE THE OPERATIONAL PRESSURIZATION CHK AND RELEASED THE AIRPLANE FOR SVC. FIRST FLT THE AIRPLANE CAME BACK WITH PRESSURIZATION PROBS.

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.

A CRJ700 was released for service after the aft cargo door seal was replaced. Flight crew experienced pressurization problems. Returned to departure airport. The door seal labeling was allegedly reversed.