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A technician reports carrier has 3 cvr system for the B737-300 with parts not interchangeable and with limited accurate effectivity information.
| Attributes | |
| ACN | 539694 |
| Time | |
| Date | 200201 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance technician : 24 |
| ASRS Report | 539694 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | other other : person 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : work cards performance deficiency : repair performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Chart Or Publication Maintenance Human Performance Company |
| Primary Problem | Chart Or Publication |
Narrative:
Maintenance manual supplement to 23-71-00 page 1 states that there are 2 cvr system installed, and are interchangeable. There is now 3 system, and are not readily interchangeable. The maintenance manual does not address the 3 cvr type. Instead, we are to use local computer system to verify part number. Original confign was company part number cockpit unit 32319 and cvr 92309. The 92309 unit was faulty. Part sent to repair the aircraft was a 2320. There is no maintenance manual reference to this unit. Maintenance control was contacted for a resolution. About 3 hours later, they informed me that cockpit unit 32319 and cvr 2320 were a compatible combination per computer system. Maintenance control said to 'install the unit and press to test, it either works or it doesn't.' days later I was informed the cvr failed to test resolution was a parts confign was found to be incompatible. Correction was to change the cockpit unit to configure it to the cvr. Later research into computer system reveals that cockpit unit 32319 configures to 2320 cvr, but if using 2320 cvr to configure, it states to use a 32313 cockpit unit.
Original NASA ASRS Text
Title: A TECHNICIAN RPTS CARRIER HAS 3 CVR SYS FOR THE B737-300 WITH PARTS NOT INTERCHANGEABLE AND WITH LIMITED ACCURATE EFFECTIVITY INFO.
Narrative: MAINT MANUAL SUPPLEMENT TO 23-71-00 PAGE 1 STATES THAT THERE ARE 2 CVR SYS INSTALLED, AND ARE INTERCHANGEABLE. THERE IS NOW 3 SYS, AND ARE NOT READILY INTERCHANGEABLE. THE MAINT MANUAL DOES NOT ADDRESS THE 3 CVR TYPE. INSTEAD, WE ARE TO USE LCL COMPUTER SYS TO VERIFY PART NUMBER. ORIGINAL CONFIGN WAS COMPANY PART NUMBER COCKPIT UNIT 32319 AND CVR 92309. THE 92309 UNIT WAS FAULTY. PART SENT TO REPAIR THE ACFT WAS A 2320. THERE IS NO MAINT MANUAL REF TO THIS UNIT. MAINT CTL WAS CONTACTED FOR A RESOLUTION. ABOUT 3 HRS LATER, THEY INFORMED ME THAT COCKPIT UNIT 32319 AND CVR 2320 WERE A COMPATIBLE COMBINATION PER COMPUTER SYS. MAINT CTL SAID TO 'INSTALL THE UNIT AND PRESS TO TEST, IT EITHER WORKS OR IT DOESN'T.' DAYS LATER I WAS INFORMED THE CVR FAILED TO TEST RESOLUTION WAS A PARTS CONFIGN WAS FOUND TO BE INCOMPATIBLE. CORRECTION WAS TO CHANGE THE COCKPIT UNIT TO CONFIGURE IT TO THE CVR. LATER RESEARCH INTO COMPUTER SYS REVEALS THAT COCKPIT UNIT 32319 CONFIGURES TO 2320 CVR, BUT IF USING 2320 CVR TO CONFIGURE, IT STATES TO USE A 32313 COCKPIT UNIT.
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.