Atlamt From United States of America, joined Sep 2001, 246 posts, RR: 3
Reply 1, posted (9 years 11 months 3 weeks 3 days 5 hours ago) and read 2821 times:
The fueling system itself is pretty reliable. The indication system is another story. We get fuel qty bite messages on a regular basis. Most of the time when you bite the box it verifies no faults are present. Reset the box and go flying.
We have gone to a new style of processor and it has helped but didn't completely fix the problem.
Tristarsteve From Sweden, joined Nov 2005, 4345 posts, RR: 32
Reply 2, posted (9 years 11 months 3 weeks 3 days 4 hours ago) and read 2819 times:
FGIS Bite maint messages are quite common, but the system itself is very reliable. One feature of the B757 is that when you dial up 6000kg on the preselect, it stops with 6000kg in the tank. I think it is the only aircraft I work on which is so precis. Note that the older B757s (pre about 1998) refuel very slowly. It can take 20 mins to get to full wings ( about 13200kg), but about the same time to get to full tanks!.
I can only remember once doing a manual override of a refuel valve in 20 years. Even with a gauge failure the valves still open using the refuel panel switches.
One tip, if no fuel goes in it can be the overfill system at fault. Try pressing the overfill reset. If the fuel flows, then stops again when you let go then you can keep the button pushed in with a Shell water detector metal container. Get one from the refueller and bend it slightly and you cab wedge the button in. Saves your fingers. This happens about 4 times a year.
HAWK21M From India, joined Jan 2001, 31875 posts, RR: 54
Reply 4, posted (9 years 11 months 3 weeks 2 days 12 hours ago) and read 2774 times:
Quoting Tristarsteve (Reply 2): One tip, if no fuel goes in it can be the overfill system at fault. Try pressing the overfill reset. If the fuel flows, then stops again when you let go then you can keep the button pushed in with a Shell water detector metal container. Get one from the refueller and bend it slightly and you cab wedge the button in. Saves your fingers. This happens about 4 times a year.
What was the Snag Rectification.
Replaced Overfill Sensor.
Dl757md From United States of America, joined May 2004, 1564 posts, RR: 15
Reply 7, posted (9 years 11 months 3 weeks 1 day 12 hours ago) and read 2723 times:
Quoting HAWK21M (Reply 4): What was the Snag Rectification.
Replaced Overfill Sensor.
The first thing you want to do is see if you get any fuel out of the surge tank sump drains. I've gotten as much as a gallon out of them and it fixes the problem. In my experience this has been the cause about 30% of the time.
No, people just like to shoot the messenger. Drain the fuel out of the tank and move along. Occasionally a bad sensor, I also see to recall a relay we've replaced before.
A chronic problem was the D1, D2, D3 messages on the FQIS processor. Basically telling you the densitometer was bad. Used to be radioactive, don't think it is anymore. Problem seems to have gone away also.
Fr8Mech From United States of America, joined Sep 2005, 6694 posts, RR: 16
Reply 11, posted (9 years 11 months 3 weeks 4 hours ago) and read 2678 times:
Here's a quick tidbit of information:
When the fuel panel door is opened, some people will slam it open in order to go passed the detents. This slamming may cause damamge to the bulbs installed on the door. If the bulb filiment shorts, not breaks and opens, but shorts to the base, it may cause the FQIS processor to fail. Seen it, lived it, learned a big lesson from it.
A/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 3
Reply 13, posted (9 years 11 months 2 weeks 6 days 12 hours ago) and read 2660 times:
Hi HAWK, well the night shift found a damaged wire going to the refuel panel, that loom that runs stupidly close to the slat drive shafts, carried out the repair and the refuel panel functioned satis, does anyone else think that wiring loom behined the refuel panel runs a little close? has it been SB'd out of the problem?