munirabbasi Posted December 5, 2019 Share Posted December 5, 2019 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 Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted December 11, 2019 Share Posted December 11, 2019 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? Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted December 12, 2019 Author Share Posted December 12, 2019 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 Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted December 14, 2019 Share Posted December 14, 2019 good work! Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted January 1, 2020 Author Share Posted January 1, 2020 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 Quote Link to comment Share on other sites More sharing options...
NATOPS1 Posted January 1, 2020 Share Posted January 1, 2020 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... Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted January 2, 2020 Author Share Posted January 2, 2020 Thanks Munir Abbasi Quote Link to comment Share on other sites More sharing options...
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