737 center tank fuel pumps
Thread Starter
Joined: Nov 1999
Posts: 65
Likes: 0
From: Europe
737 center tank fuel pumps
Hi all,
On the NG there is an otion which turns the fuel pump automatically off a while after the fuel low pressure light came on. Does anybody here knows how much time after the light came on?
Thanks for your help
JP
On the NG there is an otion which turns the fuel pump automatically off a while after the fuel low pressure light came on. Does anybody here knows how much time after the light came on?
Thanks for your help
JP
Joined: Jan 2002
Posts: 960
Likes: 0
From: Brisbane, Australia
Guys,
This is a production line update, starting at Line Number 1494, with deliveries starting May, 2004.
This, and other associated mods, were available for post-production retro-fit via Boeing Service Bulletin 737-28A1206, dated 11 January 2006.
Cheers...FD...
This is a production line update, starting at Line Number 1494, with deliveries starting May, 2004.
This, and other associated mods, were available for post-production retro-fit via Boeing Service Bulletin 737-28A1206, dated 11 January 2006.
Cheers...FD...
Joined: Jan 2008
Posts: 2,296
Likes: 305
From: All at sea
And if you don't have the mod, or don't know for sure if the wiring shielding etc has been done, play safe and switch off BOTH centre tank pumps at the first indication of low pressure. Some guys try to suck every last drop out. If you need the fuel that bad, you are already in trouble.
Joined: Feb 2008
Posts: 1,342
Likes: 0
From: Wingham NSW Australia
CWT pumps
My thoughts are that as soon as it is obvious that the pumps have begun to cavitate, if there is not an AUTO-OFF function, turn them OFF. The pumps depend on the fuel for cooling and lubrication and nothing is gained by running them when the fuel is so low as to be unable to be picked up sufficiently to maintain constant pressure. BTW, it is not just the centre wing pumps which should not be run without fuel.
Joined: Nov 2005
Posts: 342
Likes: 1
From: right here
the nitro gen is coming slowly and if installed it's deact.
we rely on opening crossfeed at 2,000pds + switching one ctr pump off.
then you get master caution as soon as the other starts blinkin low press
we rely on opening crossfeed at 2,000pds + switching one ctr pump off.
then you get master caution as soon as the other starts blinkin low press
Joined: May 2001
Posts: 445
Likes: 0
From: Mumbai, INDIA
Even on grd Fuel tx ops.The procedure is if One LP lt of the Ctr tank boost pump illuminates its shut off,the second can run until its confirmed that no fuel is being transferred by qty indicators & can be shut off.
Although personally I feel thats running the pump dry.
regds
MEL.
Although personally I feel thats running the pump dry.
regds
MEL.
Joined: Jun 2005
Posts: 182
Likes: 2
From: USA
Hi,
Here a quote from this link:Fuel
Here a quote from this link:Fuel
Leaving a fuel pump on with a low pressure light illuminated is not only an explosion risk (see Thai and Philippine write offs) but also if a pump is left running dry for over approx 10 minutes it will lose all the fuel required for priming which will render it inoperative even when the tank is refuelled. If you switch on the centre tank pumps and the LP lights remain illuminated for more than 19 seconds then this is probably what has happened. The pumps should be switched off and considered inop until they can be re-primed.
Joined: Jun 2001
Posts: 2,627
Likes: 2
From: UTC +8
No center tank fuel pump should be inside the center tank in any airplane! The failsafe location is to mount the center tank pump(s) inside an adjacent main tank. A la DC-8, etc . . .
I'm a Boeing driver and for the life of me I can't comprehend why, after so many center tank explosions, uncle Boeing still keeps mounting center tank pumps inside the center tank. It's engineering stupidity.
I'm a Boeing driver and for the life of me I can't comprehend why, after so many center tank explosions, uncle Boeing still keeps mounting center tank pumps inside the center tank. It's engineering stupidity.
