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DinoC-130

Gearbox Low Pressure in Flight

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Hi. We have a problem with the gearbox pressure of a C-130 T56-A-15 engine. The pressure is low at Flight Level 100 and up. The pressure in gearbox is OK when start engine on ground.

We verified oil tank, its OK; pressurization valve in the tank, its OK; shutoff valve, its OK; verified the oil lines, they are OK; changed Gearbox pump, the problem continues in the same conditions and changed the gearbox, the problem continues in the same conditions.

An important detail about this problem is that when the problem occurs, the level oil tank increase. 1,5 gallons aprox. when the gearbox pressure is 148 PSI.

Can someboby help us?

Thank you very much.

Regards.

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Dino, it sounds like you have a collapsing flexible line. Looks ok on the ground, but once oil is flowing through the inner wall is collapsing .

Other possibility is the follower in the tank may be damaged. I have had this a couple times

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On 5/10/2020 at 11:24 PM, pjvr99 said:

Dino, it sounds like you have a collapsing flexible line. Looks ok on the ground, but once oil is flowing through the inner wall is collapsing .

Other possibility is the follower in the tank may be damaged. I have had this a couple times

Thanks you very much for your answer.

We took many actions: We changed the oil tank with new oil level flotant, the flexible hose that connect the oil tank with the gearbox oil pump, the shutoff valve locate below of the oil tank and we repeated the prodedure of fill oil tank with new oil. Also, we changed the oil filter because the filter was very dirty.

Then of this, the problem dissapeared.

I hope that our experiencie will serve you.

Regards.

 

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可能是油濾堵塞或髒汙導致滑油進入系統跟回油的效果不好,之前通常會看減速段滑油濾跟外部滑油濾

It may be that the oil filter is clogged or dirty, which causes the oil to enter the system and return the oil. The effect is not good.

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