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UT Suction boost WX Light


munirabbasi
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Hello Herks Hydra Expertise!

B model aircraft,During Retraction cycle of landing gears  with UT system (in-flight) low pressure WX light of UT suction boost pump was Flickered and extinguished when gears were up and locked.   Manufacture  of Suction pump is able corporation sealed type and  without cooling FAN  and also without modification (C-130E airplanes AF72-1288 and up and C-13OH airplanes have a suction boost by-pass circuit. The by-pass line contains a restrictor and a check valve that will continuously circulate one GPM of fluid, from the suction boost pump back to the booster system reservoir, to provide a cooler operating boost pump).  FE Said operation of LDG were  not conducted along  with FLAP ops simultaneously. any expert opinion

Munir Abbasi

Home Hercules Pakistan

 

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Is this the same aircraft that was having these issues?  There was a post about a week ago with similar issues

Previous history of this?  Any recent maintenance done?

I wouldn't automatically call it bad if it just flickered.   It could be a loose cannon plug on the low press switch and the gear going up shook the wall.  It could just be a loose push to test on the warning light.

What has been done to resolve?

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3 hours ago, hehe said:

Is this the same aircraft that was having these issues?  There was a post about a week ago with similar issues

Previous history of this?  Any recent maintenance done?

I wouldn't automatically call it bad if it just flickered.   It could be a loose cannon plug on the low press switch and the gear going up shook the wall.  It could just be a loose push to test on the warning light.

What has been done to resolve?

No and No previous history of hydraulic defect or maintenance  regrading hydraulic system. Low PRESS WX SW connector was checked found SAT . wiring security and circuit checked found SAT . Defect could not duplicate on ground.

Best Regards

Munir Abbasi

Home Hercule4s Pakistan

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Check the simple things

Util reservoir filters (pressure return/case drains and reservoir vemt filter).  Something as simple as a wet vent filter can cause enough of a liquid lock that pump would cavitate during large draw such as landing gear movement.

Swap the low pressure switch to booster side.   See if it follows the switch to booster side.

Check the landing gear flow regulators.  Should be free flow toward motor and regulated away on both up/down lines.

What was the util system pressure drop?  Did it drop below or around 1300 psi?

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9 hours ago, hehe said:

Check the simple things

Util reservoir filters (pressure return/case drains and reservoir vemt filter).  Something as simple as a wet vent filter can cause enough of a liquid lock that pump would cavitate during large draw such as landing gear movement.

Swap the low pressure switch to booster side.   See if it follows the switch to booster side.

Check the landing gear flow regulators.  Should be free flow toward motor and regulated away on both up/down lines.

What was the util system pressure drop?  Did it drop below or around 1300 psi?

Thanks for immediate response

Oh! Teflon hose , mounted bottom of utility system reservoir was found kinked 

Picture1.png

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10 hours ago, hehe said:

Check the simple things

Util reservoir filters (pressure return/case drains and reservoir vemt filter).  Something as simple as a wet vent filter can cause enough of a liquid lock that pump would cavitate during large draw such as landing gear movement.

Swap the low pressure switch to booster side.   See if it follows the switch to booster side.

Check the landing gear flow regulators.  Should be free flow toward motor and regulated away on both up/down lines.

What was the util system pressure drop?  Did it drop below or around 1300 psi?

Thanks for immediate response

Oh! Flexible hose, mounted  bottom of reservoir was found  Collapsed

Munir Abbasi

 

10 hours ago, hehe said:

 

Picture1.png

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