![]() Title: An A330 aircraft had fuel quantity indication failures that did not show up as fuel faults in the Aircraft Condition Monitoring System (ACMS). allowing more time on ground for water to settle allowing proper sumping.Įnter your search terms Submit search form At that time fuel quantity indicating system (fqis) showed proper increase in fuel load. tanks sumped after flight canceled and aircraft was moved to remote area. Aircraft was fueled to 112 000 pounds for correct distribution.I suspect improper sumping not necessarily on maintenance behalf but rather on extremely short turn times these aircraft experience during heavy summer flying season/schedule. After completing their fuel transfer all indications checked normal and no other faults could be found. After tow the left inner tank had increased by the 2 000 pounds that was not showing previously. However before they accomplished this they repositioned aircraft. I instructed maintenance to transfer fuel in 1 000 pound increments to the left inner tank and to verify fuel increased in that tank only and not the other tanks. ![]() The left inner tank indication could not be MEL'd due to the pre-existing MEL for the left inner tank detection system was inoperative. The mli sticks for the left inner tank did show an increase for the metered fuel added. ![]() Therefore they were saying that their six eyes were more believable than the aircraft's fuel indicating system. The total fuel increased but to their knowledge there was no indication that it went to the left inner tank or other tanks. They metered in 2 000 pounds supposedly into the left inner tank and the three pilots watched the indication for that left inner tank and it did not increase. Therefore I could apply the MEL for the mli system. If there was an error between the fuel quantity indicating system (fqis) or the mli system I would say that the mli system would be in error with the human factor of not reading the charts or sticks correctly.there were no real time aircraft condition monitoring system (acms) faults and no faults in the fqis. The magnetic level indicator (mli) system as per the fuel manual for the inner tanks are accurate to +/- 5% of their indication. I explained to the captain that the fuel quantity system (fqs) is very accurate and if no faults were displayed that there was nothing wrong with the system. But no other faults for the fuel quantity or fuel system faults. There was an MEL 28-25-03b for the left inner tank high level detection system inoperative.
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