A mechanic and a lead report about an incorrect cabin management unit (cmu) being installed on a B73...

Attributes
ACN	797449
Time
Date	200807
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
Experience	maintenance technician : 5.75
ASRS Report	797449
Person 2
Affiliation	company : air carrier
Function	maintenance : lead technician
Qualification	technician : powerplant technician : airframe
Experience	maintenance repairman : 13 maintenance technician : 8
ASRS Report	797453
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : published procedure
Independent Detector	other other : 1-2
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : non compliance with legal requirements performance deficiency : training
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

ACARS inoperative. I installed incorrect cabin management unit and misunderstood how to verify effectiveness and part engineering note. Aircraft should have had cabin management unit installed which is ok for all aircraft. Incorrect part found and removed and replaced with correct one. After being notified today of this mistake; I met with my crew and leads and supervisor to discuss how this happened; so that not only I have learned from this and rest of the crew are more aware that these mistakes can happen. So it won't happen again. Supplemental information from acn 797453: this report is being submitted as a result of the wrong cmu being installed on aircraft. I was the lead mechanic that night; and had asked the other mechanic if he had verified effectivity of the part. He said that he had and I had no reason to doubt him. I guess he was confused because the wrong cmu part number was installed. And as a result not only will I continue to ask the mechanics if they verified effectivity of the parts they install; I will check effectivity also.

Original NASA ASRS Text

Title: A MECH AND A LEAD RPT ABOUT AN INCORRECT CABIN MGMNT UNIT (CMU) BEING INSTALLED ON A B737-700 ACFT.

Narrative: ACARS INOP. I INSTALLED INCORRECT CABIN MGMNT UNIT AND MISUNDERSTOOD HOW TO VERIFY EFFECTIVENESS AND PART ENGINEERING NOTE. ACFT SHOULD HAVE HAD CABIN MGMNT UNIT INSTALLED WHICH IS OK FOR ALL ACFT. INCORRECT PART FOUND AND REMOVED AND REPLACED WITH CORRECT ONE. AFTER BEING NOTIFIED TODAY OF THIS MISTAKE; I MET WITH MY CREW AND LEADS AND SUPVR TO DISCUSS HOW THIS HAPPENED; SO THAT NOT ONLY I HAVE LEARNED FROM THIS AND REST OF THE CREW ARE MORE AWARE THAT THESE MISTAKES CAN HAPPEN. SO IT WON'T HAPPEN AGAIN. SUPPLEMENTAL INFO FROM ACN 797453: THIS RPT IS BEING SUBMITTED AS A RESULT OF THE WRONG CMU BEING INSTALLED ON ACFT. I WAS THE LEAD MECH THAT NIGHT; AND HAD ASKED THE OTHER MECH IF HE HAD VERIFIED EFFECTIVITY OF THE PART. HE SAID THAT HE HAD AND I HAD NO REASON TO DOUBT HIM. I GUESS HE WAS CONFUSED BECAUSE THE WRONG CMU PART NUMBER WAS INSTALLED. AND AS A RESULT NOT ONLY WILL I CONTINUE TO ASK THE MECHS IF THEY VERIFIED EFFECTIVITY OF THE PARTS THEY INSTALL; I WILL CHK EFFECTIVITY ALSO.

Data retrieved from NASA's ASRS site as of May 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 mechanic and a lead report about an incorrect cabin management unit (cmu) being installed on a B737-700 aircraft.