B 737-500 DC booster pump
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Joined: Sep 2005
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From: EE
B 737-500 DC booster pump
Can anyboby tell me something more about a DC booster pump in the left main tank of the B737-500? Is it installed on all the 500s?
I couldn`t find anything about that anywhere. Just in the Derek Watts` fuel schematic.
Thank you.
I couldn`t find anything about that anywhere. Just in the Derek Watts` fuel schematic.
Thank you.
Joined: Aug 2005
Posts: 1,693
Likes: 0
From: fairly close to the colonial capitol
The DC pump assists in fuel pressure boost for APU startup when no AC power is available for the L main tank pumps - a consideration for the -500 which can operate out of smaller (and more bucolic) airports where power carts/ground AC theoritically wouldn't always be available.
The -500 is usually equipped with a dedicated APU battery using the same reasoning - self-reliance on the ground.
I wouldn't be surprised if a few airline-spec'd -500's did not have the DC pump - but don't have any direct knowledge regarding the omission.
EDIT: Oh hello Gary - simultaneous post nearly - you beat me to it
The -500 is usually equipped with a dedicated APU battery using the same reasoning - self-reliance on the ground.
I wouldn't be surprised if a few airline-spec'd -500's did not have the DC pump - but don't have any direct knowledge regarding the omission.
EDIT: Oh hello Gary - simultaneous post nearly - you beat me to it
