Kappa Posted November 5, 2020 Posted November 5, 2020 Hi, as stated in this post: https://forums.eagle.ru/forum/english/licensed-third-party-projects/razbam/av-8b-n-a/resolved-bugs/290678-as-intended-no-brakes a couple of updates ago, a new feature was implemented. Now the HYD system need to charge and accumulate pressure before you can have a working brake system. Nice feature, however, only seems to take effect if cold starded from a ship. If you make a cold start from an airport, the hydraulic pressure is at maximum as soon as you enter the cockpit. is it as intended? NoBrakes3.trk -- [sIGPIC][/sIGPIC] 36° Stormo Virtuale - Italian Virtual Flight Community www.36stormovirtuale.net
RAZBAM_ELMO Posted November 6, 2020 Posted November 6, 2020 Where are you making the cold start on land, at what altitude? Know and use all the capabilities in your airplane. If you don't, sooner or later, some guy who does use them all will kick your ass. — Dave 'Preacher' Pace, USN.
Kappa Posted November 6, 2020 Author Posted November 6, 2020 Batumi? 20 ft ASL? -- [sIGPIC][/sIGPIC] 36° Stormo Virtuale - Italian Virtual Flight Community www.36stormovirtuale.net
Beltza Posted November 7, 2020 Posted November 7, 2020 I can confirm this. In cold start in the Tarawa (or L61) you have to charge the hydraulic system but not in any airport.It is a nice feature. [sIGPIC]https://imgur.com/pdHN44Y.jpg[/sIGPIC] 24 Flotilla Geweih
Kappa Posted November 8, 2020 Author Posted November 8, 2020 @RAZBAM_ELMO can you confirm this have been reported? -- [sIGPIC][/sIGPIC] 36° Stormo Virtuale - Italian Virtual Flight Community www.36stormovirtuale.net
RAZBAM_ELMO Posted November 10, 2020 Posted November 10, 2020 Looking into it still. Because it happens on the boat, We dont yet know if this is a user error, a DCS bug or simply an issue with the harrier and tarawa exclusively. Know and use all the capabilities in your airplane. If you don't, sooner or later, some guy who does use them all will kick your ass. — Dave 'Preacher' Pace, USN.
Kappa Posted November 23, 2020 Author Posted November 23, 2020 Looking into it still. Because it happens on the boat, We dont yet know if this is a user error, a DCS bug or simply an issue with the harrier and tarawa exclusively. @RAZBAM_ELMO still investigating? -- [sIGPIC][/sIGPIC] 36° Stormo Virtuale - Italian Virtual Flight Community www.36stormovirtuale.net
ChickenSim Posted November 23, 2020 Posted November 23, 2020 @Kappa I'm not quite sure the brake system is supposed to be charged like this during routine operations. If the parking brake is left on with the engine off, hydraulic pressure ought to bleed off after about 3 hours and the aircraft needs to be chocked anyway. Maintenance has the ability to service the aircraft to ensure at least 1000 PSI on the accumulator and 1500 PSI on the pressure gauge prior to engine start. If it's not there, and maintenance can't service it, the aircraft needs to be tied down or chocked prior to starting engines (because it'll be moving at idle power and you won't have any braking function until it's charged). "It is also true that we parted ways with Chicken after some disagreements."
Kappa Posted November 23, 2020 Author Posted November 23, 2020 @Kappa I'm not quite sure the brake system is supposed to be charged like this during routine operations. If the parking brake is left on with the engine off, hydraulic pressure ought to bleed off after about 3 hours and the aircraft needs to be chocked anyway. Maintenance has the ability to service the aircraft to ensure at least 1000 PSI on the accumulator and 1500 PSI on the pressure gauge prior to engine start. If it's not there, and maintenance can't service it, the aircraft needs to be tied down or chocked prior to starting engines (because it'll be moving at idle power and you won't have any braking function until it's charged). Actually I'm just reporting that the system behaves differently on the ground than on a ship, I don't make any assumptions about how the plane's hydraulic systems works. I don't have the knowledge to do that. :) Anyway, thanks for sharing your knowledge :) 1 -- [sIGPIC][/sIGPIC] 36° Stormo Virtuale - Italian Virtual Flight Community www.36stormovirtuale.net
ChickenSim Posted November 23, 2020 Posted November 23, 2020 @Kappa understood, just wanted to clarify since you referred to it as a "feature" in your first post. :smilewink: We should be thankful the surface friction is what it is and the plane isn't moving at idle, otherwise there'd be a lot of DCS Harriers in the drink right now. "It is also true that we parted ways with Chicken after some disagreements."
flo57100 Posted November 23, 2020 Posted November 23, 2020 Hello there, I just had a look in the NATOPS manual, in the last pages where you have a complete diagramm of the harrier hydraulic. If you look at the center of this diagramm, in the bottom part of it, you can find a brake accumulator with its charge valve in nose gear wheel well, pressurised by: - either main hydraulic system 1 - either the hydraulic manual hand pump So, in my opinion, you should have brake pressure available from the accumulator during cold start. As you can see on the diagramm if you look at it, the cockpit brake pressure gage is even shown with the accumulator And, if you want to see if it is 100% accurate, check during cold start if you have brake pressure indicated. Before you start the engine or the apu, press brake pedals a few times, pressure should drop to 0. And, after engine start, pressure should increase as it is now pressurised by hydraulic system 1. I will try on my side when I Wil be back from work, or tomorrow morning
flo57100 Posted November 24, 2020 Posted November 24, 2020 Good morning, OK, I tried the brakes. From what I saw, at cold start (BUT BATTERY IS ON, as gage needs electrical power), brake pressure gage shows 0. In my opinion, this is wrong as there should still be hydraulic pressure from the brake accumulator. An other thing that seems wrong (but I might be wrong), when engine is running, pressure gage shows 0, and when you press brake pedals, pressure rises and drops back to 0 when you release the brake pedals. It should be the opposite. When engine is running, you should read brake pressure on the gage, when you press the brake pedals pressure should slightly decrease, and brake pressure should go back its initial value when you release brake pedals. An other clue that makes me think this hydraulic brake pressure is wrong, is the fact that if you do not have hydraulic pressure available from the accumulator on a dark and cold aircraft (cockpit brake pressure gage should show pressure available, not 0), you may have to tow the plane out of the grass because there is no more hydraulic pressure to keep the parking brake applied (OK, shocks should be in place in front of wheels, be let's assume they are not). But it would be nice to have the view of a real life harrier mechanic or crew chief, to be sure, I do not work on this plane, I can not pretend to know how it works exactly IRL
RAZBAM_ELMO Posted December 18, 2020 Posted December 18, 2020 Issue has been resolved in latest update, marking as RESOLVED and moving to RESOLVED. 1 Know and use all the capabilities in your airplane. If you don't, sooner or later, some guy who does use them all will kick your ass. — Dave 'Preacher' Pace, USN.
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