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A B737-400 center tank fuel quantity indicator was deferred as inoperative per the MEL. Technician used B737-200 special procedures for deferral.
| Attributes | |
| ACN | 722779 |
| Time | |
| Date | 200612 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : msp.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 722779 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : ctr tank fuel qty indicator other flight crewa other flight crewb |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Environmental Factor Chart Or Publication Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Yesterday callouts were coming at us left and right. I was called out to aircraft X for a center fuel quantity indicator has error code 1 and 5. The aircraft was fully boarded and ready to go. I MEL'ed aircraft X for a center quantity indicator being inoperative. We were using MEL and while performing the maintenance procedures to deactivate the fsu (fuel summation unit); I ended up using the procedures for the B-200 aircraft instead of the B-400 aircraft. Which the B-400 aircraft calls out for pulling and collaring a circuit breaker and the B-200 aircraft calls out for capping and stowing the fsu cannon plug for deactivation. I did confirm with maintenance control that I was accomplishing special procedures MEL for MEL deactivating the fsu and completing a placard. Which he confirmed! But we never verbally confirmed if I was reading the B-200 or the B-400 aircraft MEL. This is where I think we lost each other and the mistake was made. Lastly with main tank MEL; which I have done many times over the center MEL; it does call for capping and stowing the fsu cannon plug on 400 aircraft for deactivation; just like the B-200 aircraft on MEL.
Original NASA ASRS Text
Title: A B737-400 CTR TANK FUEL QUANTITY INDICATOR WAS DEFERRED AS INOP PER THE MEL. TECHNICIAN USED B737-200 SPECIAL PROCS FOR DEFERRAL.
Narrative: YESTERDAY CALLOUTS WERE COMING AT US LEFT AND RIGHT. I WAS CALLED OUT TO ACFT X FOR A CTR FUEL QUANTITY INDICATOR HAS ERROR CODE 1 AND 5. THE ACFT WAS FULLY BOARDED AND READY TO GO. I MEL'ED ACFT X FOR A CTR QUANTITY INDICATOR BEING INOP. WE WERE USING MEL AND WHILE PERFORMING THE MAINT PROCS TO DEACTIVATE THE FSU (FUEL SUMMATION UNIT); I ENDED UP USING THE PROCS FOR THE B-200 ACFT INSTEAD OF THE B-400 ACFT. WHICH THE B-400 ACFT CALLS OUT FOR PULLING AND COLLARING A CIRCUIT BREAKER AND THE B-200 ACFT CALLS OUT FOR CAPPING AND STOWING THE FSU CANNON PLUG FOR DEACTIVATION. I DID CONFIRM WITH MAINT CTL THAT I WAS ACCOMPLISHING SPECIAL PROCS MEL FOR MEL DEACTIVATING THE FSU AND COMPLETING A PLACARD. WHICH HE CONFIRMED! BUT WE NEVER VERBALLY CONFIRMED IF I WAS READING THE B-200 OR THE B-400 ACFT MEL. THIS IS WHERE I THINK WE LOST EACH OTHER AND THE MISTAKE WAS MADE. LASTLY WITH MAIN TANK MEL; WHICH I HAVE DONE MANY TIMES OVER THE CTR MEL; IT DOES CALL FOR CAPPING AND STOWING THE FSU CANNON PLUG ON 400 ACFT FOR DEACTIVATION; JUST LIKE THE B-200 ACFT ON MEL.
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.