After changing a captain's audio control panel on a next generation B737 for a VHF #1 selector probl...

Attributes
ACN	786027
Time
Date	200805
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	786027
Events
Anomaly	maintenance problem : improper maintenance non adherence : published procedure
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : manuals performance deficiency : installation performance deficiency : non compliance with legal requirements performance deficiency : testing
Supplementary
Problem Areas	Maintenance Human Performance Chart Or Publication Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

I was called out to aircraft X for a captain's audio control panel that could not be selected to #1 VHF communication. I went to the line stores and saw 2 audio control panels for the B737's. I saw one of them was for fleet model X and the other was for fleet model Y. Since aircraft is a next generation; I took the box with the fleet model Y. I installed the audio control panel and operations checked it reference maintenance manual. I was later called to the aircraft by the crew asking if the panel I installed was the correct panel. The panel I installed had the servo and flight interphone selectors reversed from the other audio control panels. I checked the supplemental ipc and discovered the correct part for that aircraft is part #xyz or xyx. This is the same part number as the -400 fleet uses. The part number I installed is for -800 aircraft only. I initiated a new log page and installed the correct part.

Original NASA ASRS Text

Title: AFTER CHANGING A CAPTAIN'S AUDIO CONTROL PANEL ON A NEXT GENERATION B737 FOR A VHF #1 SELECTOR PROBLEM; MECHANIC IS QUESTIONED BY FLIGHT CREW WHY THE SERVICE AND INTERPHONE SELECTORS ARE REVERSED FROM THE OTHER AUDIO PANELS.

Narrative: I WAS CALLED OUT TO ACFT X FOR A CAPT'S AUDIO CTL PANEL THAT COULD NOT BE SELECTED TO #1 VHF COM. I WENT TO THE LINE STORES AND SAW 2 AUDIO CTL PANELS FOR THE B737'S. I SAW ONE OF THEM WAS FOR FLEET MODEL X AND THE OTHER WAS FOR FLEET MODEL Y. SINCE ACFT IS A NEXT GENERATION; I TOOK THE BOX WITH THE FLEET MODEL Y. I INSTALLED THE AUDIO CTL PANEL AND OPS CHKED IT REF MAINT MANUAL. I WAS LATER CALLED TO THE ACFT BY THE CREW ASKING IF THE PANEL I INSTALLED WAS THE CORRECT PANEL. THE PANEL I INSTALLED HAD THE SERVO AND FLT INTERPHONE SELECTORS REVERSED FROM THE OTHER AUDIO CTL PANELS. I CHKED THE SUPPLEMENTAL IPC AND DISCOVERED THE CORRECT PART FOR THAT ACFT IS PART #XYZ OR XYX. THIS IS THE SAME PART NUMBER AS THE -400 FLEET USES. THE PART NUMBER I INSTALLED IS FOR -800 ACFT ONLY. I INITIATED A NEW LOG PAGE AND INSTALLED THE CORRECT PART.

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.

After changing a captain's audio control panel on a next generation B737 for a VHF #1 selector problem; mechanic is questioned by flight crew why the service and interphone selectors are reversed from the other audio panels.