C-130 fuel dumping system

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babulbaf19

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Unread post08 Dec 2017, 04:56

I would like to know why fuel is falling through fuel dump mostly during sharp turning when ac taxing on ground.
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wbh

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Unread post14 Dec 2017, 06:58

What you have is a post LAC 3833 , AF 63-7767 fuel system . On this system the SPR shares plumbing with the dump system.Try this: allow extra time for the SPR to drain prior to closing the valves & shutting down the SPR.The fuel that you see is SPR fuel accumulating in low spots , then coming out during taxi & takeoff. This was considered major when the FY 63's went into service , but troops learned how best to refuel then the problem subsided.
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babulbaf19

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Unread post22 Dec 2017, 05:21

58-0754 LM3553 S3AGA
59-1537 LM3589 S3AGB
61-0962 LM3647 S3AGC
61-2640 LM3676 S3AGD
These are all of C-130 aircraft. .repeatedly it's occurred means fuel flow through dump must when taxing on ground.
so can we solve the problem by SPR draining proproperly?As refuelling and dump plumbing is same.but confused that dump valve for individual is not available?
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wbh

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Unread post22 Dec 2017, 09:39

The LAC No's you show have the fuel system which has separate SPR & DUMP . Give me some time to research that one. For sure fuel is getting into the Dump manifold during refueling or ground boost pump checks. I'll get back to you.
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wbh

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Unread post22 Dec 2017, 10:43

It looks like either Aux tank dump valve could be leaking into your Dump Manifold. On your series Airplane there is no Aux Tank Dump Pump , the Boost Pump serves both functions. Are the Aux Tank Pumps on during taxi ?
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wbh

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Unread post23 Dec 2017, 20:39

Merry Christmas , friend , keep sending me info & we'll get your problem sorted out. Any "B" Model experts out there , Bobdaly please join in.
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babulbaf19

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Unread post24 Dec 2017, 09:51

thanks to all of you sir as you have accepted my problem cordially..all are C-130B ac. me confused that dump line and refuelling manifold is same?If these are same fuel may fall when drain is not done properly.is it the fault of wegging fitting? but on ground ok..only during taxing its occur
you said problem of aux dump valve..
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babulbaf19

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Unread post24 Dec 2017, 09:55

it may occurred as aux pump and dump is same when aux pump remain on ..thanks sir
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wbh

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Unread post24 Dec 2017, 23:47

SPR & Dump plumbing sharing do not apply to "B" models. "B" models have separate SPR & Dump system , very simple .Question for you 1. Are the AUX Tanks full when this fuel spill happens ? 2. Are the Aux Tank Pumps on during Taxi ? 3 Does it happen on all your airplanes ? Please review the fuel system for "B" models in the flight manual ,TO 1C-130B-1.
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babulbaf19

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Unread post25 Dec 2017, 09:40

thank you sir..after inspect all of your questions. .I come back soon..

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