munirabbasi Posted November 25, 2020 Share Posted November 25, 2020 Hello Hydro Expertise On Aircraft MARK II system, at 10 knots of aircraft speed, brake was released it own when it is applied .Before 10 knots system operation was normal. The system was checked as per T.O 1C-130B-2-12 and 1C-130B-2-7 found OK. Sufficient Hydraulic bleeding was carried out. after completion of two mission defect was repeated again. Hydraulic bleeding of in normal Brake system was carried out but defect was repeated same manner. again. Any expert opinion. Munir Abbasi Home of Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
hehe Posted November 25, 2020 Share Posted November 25, 2020 Do your books states that anti-skid in inop below 15 knots? I havent messed with a mark 2 in probably 12 years. Which side is releasing? All brakes? Left or right? If its only one side, i would swap wheel speed transducers left to right and see if it follows. Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted November 26, 2020 Author Share Posted November 26, 2020 5 hours ago, hehe said: Do your books states that anti-skid in inop below 15 knots? I havent messed with a mark 2 in probably 12 years. Which side is releasing? All brakes? Left or right? If its only one side, i would swap wheel speed transducers left to right and see if it follows. No UNSAT indications were observed. (INOPERATIVE & TEST PANEL LIGHTS) All brakes were released simultaneously. Best Regards Munir Abbasi Home Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
hehe Posted November 26, 2020 Share Posted November 26, 2020 All 4 skidded or just released pressure? I would change the anti-skid control box. The entire left and right sides are separated other than the box Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted November 26, 2020 Author Share Posted November 26, 2020 6 hours ago, hehe said: All 4 skidded or just released pressure? I would change the anti-skid control box. The entire left and right sides are separated other than the box All 4 skidded.The electronic box of the system was checked with mark II tester at back shop found OK. The Anti-skid control valves of the system were checked at hydro shop found OK. We also checked the wiring of the system as per T.Os IC-130B-2-13 ,1-1A-14 and 1-1-8 found OK. We also consulted the service news VOL,8-1 Best Regards Munir Abbasi Home of Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
hehe Posted November 26, 2020 Share Posted November 26, 2020 The system should technically skid at 10 knots. The transducers dont have enough current until 15 knots to signal to anti-skid control box. Does it do it above 15 knots? You might be chasing a ghost here Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted November 27, 2020 Author Share Posted November 27, 2020 2 hours ago, hehe said: The system should technically skid at 10 knots. The transducers dont have enough current until 15 knots to signal to anti-skid control box. Does it do it above 15 knots? You might be chasing a ghost here Above 15 knots system working normal nothing was observed pilot Munir Abbasi Home Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
hehe Posted November 27, 2020 Share Posted November 27, 2020 (edited) Yea the system isnt designed to prevent a skid at 10 knots. This might be a pilot training issue more than a system issue Edited November 27, 2020 by hehe Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted November 27, 2020 Author Share Posted November 27, 2020 10 hours ago, hehe said: Yea the system isnt designed to prevent a skid at 10 knots. This might be a pilot training issue more than a system issue Sir hehe bundle of Thanks Munir Abbasi Home Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
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