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A B777 first officer reports failing to operate the left and right isolation valves per MEL procedure. MEL procedure ambiguous and confusing. Needs to be rewritten for proper understanding.
| Attributes | |
| ACN | 707458 |
| Time | |
| Date | 200608 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zspd.airport |
| State Reference | FO |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 707458 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 707459 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : valve position indication other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Chart Or Publication Aircraft |
| Primary Problem | Chart Or Publication |
| Situations | |
| Publication | MEL |
Narrative:
MEL applied to this flight and after reading the procedure several times; I failed to execute the procedure properly on takeoff. I failed to operate the left and right isolation valve switches properly. I believe this procedure needs to be rewritten for proper understanding. With the inoperative valve switch in 'automatic;' the closed light is on; leading to the belief that the procedure has been executed.
Original NASA ASRS Text
Title: A B777 FO RPTS FAILING TO OPERATE THE L AND R ISOLATION VALVES PER MEL PROC. MEL PROC AMBIGUOUS AND CONFUSING. NEEDS TO BE REWRITTEN FOR PROPER UNDERSTANDING.
Narrative: MEL APPLIED TO THIS FLT AND AFTER READING THE PROC SEVERAL TIMES; I FAILED TO EXECUTE THE PROC PROPERLY ON TKOF. I FAILED TO OPERATE THE L AND R ISOLATION VALVE SWITCHES PROPERLY. I BELIEVE THIS PROC NEEDS TO BE REWRITTEN FOR PROPER UNDERSTANDING. WITH THE INOP VALVE SWITCH IN 'AUTO;' THE CLOSED LIGHT IS ON; LEADING TO THE BELIEF THAT THE PROC HAS BEEN EXECUTED.
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.