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Originally Posted by Captain Tony
(Post 1548826)
On the CRJ 700 you have to shut both fuel boost pumps during single engine taxi, or you get a large fuel imbalance. Maybe they forgot this and thought gravity cross flow would fix it faster. And also on all CRJs you can't sit more than 10 minutes with your lights on for cooling purposes. Sounds like these guys aren't too up on their systems knowledge. But hey, all DAL cares about is cheap feed...
The boost pumps are part of our 'cleared to start' check, and they stay on throughout the entire flight (unless for a fuel check valve check). It's company SOP and evidently varies by operator. Anyway - Taxiing single engine with both boost pumps on doesn't cause an imbalance. Not any more so than taxiing single engine with them off, anyway. There's a reason the EICAS displays caution messages with an engine operating and the fuel pumps 'off'. If it were proper, there'd be no message(s). Fuel sloshes, sometimes significantly when turning, but that's about it. |
Drifting is an awesome sport
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I would honestly be more embarrassed to come into a forum and complaint about it if people here knew who I was , I've seen this done before over the years, I was inside one of the aircraft once at air whiskey , the captain came over the PA and explained the situation. It was quicker than other options and got us in time to make our connections.
Seems very immature of you, and honestly seems like you just want to bad mouth Gojets . |
Originally Posted by AVIATOR3
(Post 1549327)
I would honestly be more embarrassed to come into a forum and complaint about it if people here knew who I was , I've seen this done before over the years, I was inside one of the aircraft once at air whiskey , the captain came over the PA and explained the situation. It was quicker than other options and got us in time to make our connections.
Seems very immature of you, and honestly seems like you just want to bad mouth Gojets . Just sad how things get twisted around on here |
Buaah... Man, some people just have no sense of humor. It was probably more like 2.72 degrees per second. ;) |
Originally Posted by Trip7
(Post 1549130)
You haven't flown the plane in how many years and you still remember that? Impressive.
ASA 's procedure is to turn off both boost pump switches on during single. Leaving the operating engine boost pump switch on accomplishes the same thing since there is no low pressure sensed. I've jumpsat on a Mesa 700 and I noticed they use the boost pump switch on operating engine technique .
Originally Posted by griff312
(Post 1548974)
Correct me if I'm wrong, but... I believe that when you're running a single engine, with any boost pump on, both pumps operate and provide 200% of what the engine needs into the fuel feed manifold. Then then excess fuel is returned to the tank of the operating side engine, via a return line and motive flow ejectors. This can easily cause an imbalance, but which is usually corrected with auto crossflow, when operating. I believe our MEL procedure when operating with an MEL'd crossflow pump is to operate with both engines running, so that the excess fuel returns to both wing tanks, instead of just one.
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Originally Posted by bernouli
(Post 1549315)
Originally Posted by Captain Tony
(Post 1548826)
On the CRJ 700 you have to shut both fuel boost pumps during single engine taxi, or you get a large fuel imbalance. Maybe they forgot this and thought gravity cross flow would fix it faster. And also on all CRJs you can't sit more than 10 minutes with your lights on for cooling purposes. Sounds like these guys aren't too up on their systems knowledge. But hey, all DAL cares about is cheap feed...
The boost pumps are part of our 'cleared to start' check, and they stay on throughout the entire flight (unless for a fuel check valve check). It's company SOP and evidently varies by operator. Anyway - Taxiing single engine with both boost pumps on doesn't cause an imbalance. Not any more so than taxiing single engine with them off, anyway. There's a reason the EICAS displays caution messages with an engine operating and the fuel pumps 'off'. If it were proper, there'd be no message(s). Fuel sloshes, sometimes significantly when turning, but that's about it. |
By definition, gravity X-feed only requires the low wing to be downhill... Park in a spot with the low wing lower than the high wing.... Add time, problem solved... eventually. Or just actually CHECK the fuel gages as part of the required preflight.
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Originally Posted by Trip7
(Post 1549904)
Taxing single engine with both pumps will cause an imbalance. The boost pump will detect low pressure and turn both pumps on, which will draw fuel to operating engine from both collector tanks. Some of that fuel will be burned and some will be returned to the collector tank, but only the operating engine collector tank, causing the operating engine side fuel tank to have more fuel than the shutdown side.
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Just had to bump this......
In DTW earlier, GoJet was trying to get to the 22L deice pad, so they felt the need to make the right turn into 2N right into the ramp....as we were trying to taxi out. Good thing there was just enough room to have them turn in, and go right back out. We contact ground, and ground tells us to follow them to the deice pad. I reply back with "We'll follow them, hopefully they know where they are going." Well sure as crap, they go right by the deice pad and continue to taxi. Ground yells at them to stop immediately. Nothing like a comical fun this morning. |
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