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A B737-700 inoperative ACARS system communication management unit (cmu) was replaced with incorrect unit due to stores inventory system confusing effectivity language.
| Attributes | |
| ACN | 750424 |
| Time | |
| Date | 200707 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Controlling Facilities | tower : phl.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 : powerplant technician : airframe |
| ASRS Report | 750424 |
| Events | |
| Anomaly | maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : non availability of parts contributing factor : briefing contributing factor : manuals performance deficiency : repair performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : installation |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Chart Or Publication |
Narrative:
I had a pilot discrepancy of ACARS inoperative. Using my troubleshooting skills I came to the conclusion that the communication management unit was bad. I removed the part (cmu) and brought it to the line stores room. I logged on to the inventory computer and entered the part number of the removed cmu. We did not have the part number (Y) in stock; however there was a stores comment that says 'this item can be used in place of part X on all B737 aircraft.' I checked the shelf and saw that we had part X. From reading the notes on part Y; I thought that they were interchangeable due to it coming up using the aircraft as previously mentioned. I verified the software and installed the cmu. I performed the operations check per the maintenance manual and it operated normal. My opinion is that either part X should have never showed up or the notes on part X should also appear when you enter part Y or even put that these 2 items are one way interchangeable on certain aircraft.
Original NASA ASRS Text
Title: A B737-700 INOP ACARS SYSTEM COMMUNICATION MANAGEMENT UNIT (CMU) WAS REPLACED WITH INCORRECT UNIT DUE TO STORES INVENTORY SYS CONFUSING EFFECTIVITY LANGUAGE.
Narrative: I HAD A PLT DISCREPANCY OF ACARS INOP. USING MY TROUBLESHOOTING SKILLS I CAME TO THE CONCLUSION THAT THE COM MGMNT UNIT WAS BAD. I REMOVED THE PART (CMU) AND BROUGHT IT TO THE LINE STORES ROOM. I LOGGED ON TO THE INVENTORY COMPUTER AND ENTERED THE PART NUMBER OF THE REMOVED CMU. WE DID NOT HAVE THE PART NUMBER (Y) IN STOCK; HOWEVER THERE WAS A STORES COMMENT THAT SAYS 'THIS ITEM CAN BE USED IN PLACE OF PART X ON ALL B737 ACFT.' I CHKED THE SHELF AND SAW THAT WE HAD PART X. FROM READING THE NOTES ON PART Y; I THOUGHT THAT THEY WERE INTERCHANGEABLE DUE TO IT COMING UP USING THE ACFT AS PREVIOUSLY MENTIONED. I VERIFIED THE SOFTWARE AND INSTALLED THE CMU. I PERFORMED THE OPS CHK PER THE MAINT MANUAL AND IT OPERATED NORMAL. MY OPINION IS THAT EITHER PART X SHOULD HAVE NEVER SHOWED UP OR THE NOTES ON PART X SHOULD ALSO APPEAR WHEN YOU ENTER PART Y OR EVEN PUT THAT THESE 2 ITEMS ARE ONE WAY INTERCHANGEABLE ON CERTAIN ACFT.
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.