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munirabbasi

BRAKE RELEASE

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Hello Hydraulic expertise

AT  60 KN brake release during landing ,The operation checked o ground  found normal with tester .Wiring of the system was checked satisfactory .Anti-skid control box replaced and sufficient hydraulic bleeding carried out but defected was repeated.

Munir Abbasi

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On ‎12‎/‎5‎/‎2019 at 4:11 AM, munirabbasi said:

Hello Hydraulic expertise

AT  60 KN brake release during landing ,The operation checked o ground  found normal with tester .Wiring of the system was checked satisfactory .Anti-skid control box replaced and sufficient hydraulic bleeding carried out but defected was repeated.

Munir Abbasi

When you say release do you mean AS the crew is pushing on them? Are they full anti-skid braking or normal to light pressure?

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On 12/11/2019 at 8:05 PM, NATOPS1 said:

When you say release do you mean AS the crew is pushing on them? Are they full anti-skid braking or normal to light pressure?

Thanks ,Defect was rectified with sufficient hydraulic bleeding. 

Munir Abbasi

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On 12/14/2019 at 9:36 PM, NATOPS1 said:

good work!

NATOPS1

Anti-skid Control Box PCB A2 was burnt out what is reason behind it?

Do not test ant-skid during while aircraft is taxing (IC-130B-1 caution) if the testing is  carried out during aircraft taxing what happen with the system.

Munir Abbasi 

Home of Hercules

 

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2 hours ago, munirabbasi said:

NATOPS1

Anti-skid Control Box PCB A2 was burnt out what is reason behind it?

Do not test ant-skid during while aircraft is taxing (IC-130B-1 caution) if the testing is  carried out during aircraft taxing what happen with the system.

Munir Abbasi 

Home of Hercules

 

As you know anytime a CB or fuse does its job (pop or burn) the amperage through it has exceeded the ratting and you should look for a shorted wire or defective component. 

 

Below the anti-skid arming speed (Taxi speeds) the aircraft  will allow for testing. Most serious of the possible issues is the momentary loss of brakes as the control box senses  and then losses the "test voltage" (that simulates wheel rotation and skid) which results in the control valvbes porting brake pressure to return "effectly releasing the brakes in response to the detected skid".

The second issue would be the conflicting 400Hz "power input" that is used for testing the system and the "Wheel rotation power" developed and sent to the control box by the wheel transducers.

If the wheels are turning the wheel transducers are sending a "speed signal" to the control box it is just not "fast or hi enough" to be used and the introduction of the test signal will/could cause any number of issues like erroneous light displays which is mentioned in the -1 or  the misinterpretation of the dual wheel speed inputs (test and wheel transducers) resulting in loss of brakes or maybe even a burnt/popped CB as the control box tries to determine what to do... 

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