HYRAULIC SYSTEM A

Operating an F-16 on the ground or in the air - from the engine start sequence, over replacing a wing, to aerial refueling procedures
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ibrahimzahid

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Unread post02 Jul 2017, 07:42

HELLO FRIENDS
IS THERE ANY ONE HYRAULIC SPECIALIST WHO KNOWS THE REASONS OF INCREASINING LEVEL OF HYDRAULIC SYSTEM "A" AFTER EVERY FLIGHT UPTO 10% AND BECOMES 100% AFTER FEW FLIGHTS WITH OUT DECREASING OF PNEUMATIC PRESSURE IN ANY ACCUMULATOR ATTACHED TO HYDRAULIC SYSTEM "A"?



ya hyd level in resrvior. but its not hyd its air in hyd but I m confused from where its entering in the system.
Last edited by ibrahimzahid on 03 Jul 2017, 07:14, edited 2 times in total.
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MVSGas

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Unread post03 Jul 2017, 03:31

Are you talking about the hydraulic fluid level in the reservoir?
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MVSGas

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Unread post04 Jul 2017, 09:26

What makes you so certain that it is air? I seen the behavior for years on different aircraft, but for the most part, as long as you bleed the system regularly is should not affect anything. I think it could be crossbleed form ISA. I haven't trouble shoot hydraulics in so long anything I say is pure speculation. I know is a dumb question, but what have you found in the FI?
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jamesdasapb

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Unread post06 Jul 2017, 16:41

ibrahimzahid wrote:HELLO FRIENDS
IS THERE ANY ONE HYRAULIC SPECIALIST WHO KNOWS THE REASONS OF INCREASINING LEVEL OF HYDRAULIC SYSTEM "A" AFTER EVERY FLIGHT UPTO 10% AND BECOMES 100% AFTER FEW FLIGHTS WITH OUT DECREASING OF PNEUMATIC PRESSURE IN ANY ACCUMULATOR ATTACHED TO HYDRAULIC SYSTEM "A"?
ya hyd level in resrvior. but its not hyd its air in hyd but I m confused from where its entering in the system.



You may approach the problem like this:
1. Check the hydraulic fluid for contamination. Check if it's 100% hydraulic fluid. Could be fuel entrainment.
2. Reservice the Hydraulic A system to correct level when the system has cooled down.
3. Service the B system to correct level when the system has cooled down.
4. On next engine start, check the levels of both A & B reservoirs when reservoirs are pressurized. Note the readings.
5. After engine shut down, check the levels when reservoirs are pressurized. Note the readings.
6. Dump the pressure of both A and B reservoirs and check the levels.
7. If there is a rise in the A reservoir level and drop in B reservoir level, there is a cross flow from System B to System A. Fluid can be transferred via one of the the ISA. There is a fault code for this in the 29FI.
8. Lastly, check what was the last maintenance done on the A system hydraulics.

Rgds

James Das
jamesdas.apb@gmail.com
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jamesdasapb

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Unread post06 Jul 2017, 16:46

jamesdasapb wrote:
ibrahimzahid wrote:HELLO FRIENDS
IS THERE ANY ONE HYRAULIC SPECIALIST WHO KNOWS THE REASONS OF INCREASINING LEVEL OF HYDRAULIC SYSTEM "A" AFTER EVERY FLIGHT UPTO 10% AND BECOMES 100% AFTER FEW FLIGHTS WITH OUT DECREASING OF PNEUMATIC PRESSURE IN ANY ACCUMULATOR ATTACHED TO HYDRAULIC SYSTEM "A"?
ya hyd level in resrvior. but its not hyd its air in hyd but I m confused from where its entering in the system.



You may approach the problem like this:
1. Check the hydraulic fluid for contamination. Check if it's 100% hydraulic fluid. Could be fuel entrainment.
2. Reservice the Hydraulic A system to correct level when the system has cooled down.
3. Service the B system to correct level when the system has cooled down.
4. On next engine start, check the levels of both A & B reservoirs when reservoirs are pressurized. Note the readings.
5. After engine shut down, check the levels when reservoirs are pressurized. Note the readings.
6. Dump the pressure of both A and B reservoirs and check the levels.
7. If there is a rise in the A reservoir level and drop in B reservoir level, there is a cross flow from System B to System A. Fluid can be transferred via one of the the ISA. There is a fault code for this in the 29FI.
8. Lastly, check what was the last maintenance done on the A system hydraulics.

Rgds

James Das
jamesdas.apb@gmail.com


One last point is to reservice the pneumatic accumulators of the A system reservoir and A system Flight control accumulator.
1. How to reservice?. Release the air in the accumulators and check if there is Hyd fluid coming out. If yes, then replace the accumulator.
2. If no, then write to LM Aero and ask for assistance.

By the way where are you stationed?

James Das
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ibrahimzahid

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Unread post22 Jul 2017, 07:30

MVSGas wrote:What makes you so certain that it is air? I seen the behavior for years on different aircraft, but for the most part, as long as you bleed the system regularly is should not affect anything. I think it could be crossbleed form ISA. I haven't trouble shoot hydraulics in so long anything I say is pure speculation. I know is a dumb question, but what have you found in the FI?

THANKS A LOT SIR
AS YOU SAY THAT YOU SEEN THIS BEHAVIOUR FOR YEARS I M OBSERVING ALSO SAME
BUT BLEEDING REGULARLY IS NOT POSSIBLE HOW EVER BLEEDING EACH AND EVERY TIME AFTER MAINTENANACE IS STRICTLY OBSERVING
I ALSO OBSERVE AND NOTE MANY TIMES THAT THERE IS NO CHANGE IN SYS B SO CHANCE OF CROSS BLEED IS NOT HAPPENING
ANY HOW THANKS FOR REPLY
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ibrahimzahid

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Unread post22 Jul 2017, 07:35

MVSGas wrote:What makes you so certain that it is air? I seen the behavior for years on different aircraft, but for the most part, as long as you bleed the system regularly is should not affect anything. I think it could be crossbleed form ISA. I haven't trouble shoot hydraulics in so long anything I say is pure speculation. I know is a dumb question, but what have you found in the FI?

jamesdasapb wrote:
jamesdasapb wrote:
ibrahimzahid wrote:HELLO FRIENDS
IS THERE ANY ONE HYRAULIC SPECIALIST WHO KNOWS THE REASONS OF INCREASINING LEVEL OF HYDRAULIC SYSTEM "A" AFTER EVERY FLIGHT UPTO 10% AND BECOMES 100% AFTER FEW FLIGHTS WITH OUT DECREASING OF PNEUMATIC PRESSURE IN ANY ACCUMULATOR ATTACHED TO HYDRAULIC SYSTEM "A"?
ya hyd level in resrvior. but its not hyd its air in hyd but I m confused from where its entering in the system.



You may approach the problem like this:
1. Check the hydraulic fluid for contamination. Check if it's 100% hydraulic fluid. Could be fuel entrainment.
2. Reservice the Hydraulic A system to correct level when the system has cooled down.
3. Service the B system to correct level when the system has cooled down.
4. On next engine start, check the levels of both A & B reservoirs when reservoirs are pressurized. Note the readings.
5. After engine shut down, check the levels when reservoirs are pressurized. Note the readings.
6. Dump the pressure of both A and B reservoirs and check the levels.
7. If there is a rise in the A reservoir level and drop in B reservoir level, there is a cross flow from System B to System A. Fluid can be transferred via one of the the ISA. There is a fault code for this in the 29FI.
8. Lastly, check what was the last maintenance done on the A system hydraulics.

Rgds

James Das
jamesdas.apb@gmail.com


One last point is to reservice the pneumatic accumulators of the A system reservoir and A system Flight control accumulator.
1. How to reservice?. Release the air in the accumulators and check if there is Hyd fluid coming out. If yes, then replace the accumulator.
2. If no, then write to LM Aero and ask for assistance.

By the way where are you stationed?

James Das




SIR I HAVE DONE MOST OF THE THINGS YOU SUGGESTED
PLZ GUIDE ME MORE IF SOME THING SPECIAL COMES IN YOUR MIND
AS ALL THESE THINGS I AM DOING AGAIN AND AGAIN BUT FAIL TO PERMNENTLY REMOVE IT
OR TO STOP IT FROM HAPPENING AGAIN AND AGAIN SO FAST
THANKS A LOT

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