Atlamt From United States of America, joined Sep 2001, 237 posts, RR: 3 Reply 1, posted (7 years 1 month 4 days 23 hours ago) and read 1384 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, 3713 posts, RR: 34 Reply 2, posted (7 years 1 month 4 days 23 hours ago) and read 1382 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.
Fr8mech From United States of America, joined Sep 2005, 4347 posts, RR: 12 Reply 3, posted (7 years 1 month 4 days 22 hours ago) and read 1377 times:
I've opened plenty of fuel valves using the manual override feature. Simple and quick. Try to remember, it goes much easier with pressure off the manifold.
Fuel Qty Bite messages are rather common, Fuel Qty Channel much less so.
HAWK21M From India, joined Jan 2001, 31228 posts, RR: 58 Reply 4, posted (7 years 1 month 4 days 6 hours ago) and read 1337 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.
regds
MEL
Dl757md From United States of America, joined May 2004, 1555 posts, RR: 18 Reply 7, posted (7 years 1 month 3 days 6 hours ago) and read 1286 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.
Buzz From United States of America, joined Nov 1999, 697 posts, RR: 23 Reply 8, posted (7 years 1 month 3 days 6 hours ago) and read 1281 times:
Hi again Hawk21M, Buzz here. I've seen a lot of single channel messages for densitometer problems. But the 757 fuel qty system just keeps chugging along.
I haven't had the problems the other guys have run into, once in a while hear of it happening.
g'nite
Fr8Mech From United States of America, joined Sep 2005, 4347 posts, RR: 12 Reply 9, posted (7 years 1 month 3 days 6 hours ago) and read 1280 times:
Quoting HAWK21M (Reply 6): Is the FQIS Processor snag prone.
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, 4347 posts, RR: 12 Reply 11, posted (7 years 1 month 1 day 22 hours ago) and read 1241 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.
HAWK21M From India, joined Jan 2001, 31228 posts, RR: 58 Reply 12, posted (7 years 1 month 1 day 8 hours ago) and read 1224 times:
Quoting Fr8Mech (Reply 9): Basically telling you the densitometer was bad. Used to be radioactive, don't think it is anymore. Problem seems to have gone away also
There are two Manufacturers of the Densitometers used on the B752.Of which one is considered Radioactive.
Quoting A/c train (Reply 10): lost power completely to the refuel panel once and had to open refuel valves manually
A/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4 Reply 13, posted (7 years 1 month 1 day 6 hours ago) and read 1223 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?
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