Scotch75 Posted February 28, 2019 Posted February 28, 2019 Hey Folks I've searched this forum, Chuck's guide and the NATOPS and could not find anything. Every now an then I get a deedle-deedle advisory "TK PRES LOW". I'm thinking fuel tank pressure low, but is this internal, external or both? It even comes up constantly after I have jettisoned drop tanks. Can anyone explain this please? Many thanks. W10 Home 64Bit, Intel Skylake I5 6600K 3.50GHz, ASUS ROG Stryx Z270F MoBo, 64GB G.Skill RipJaws V DDR4 3200 RAM, Samsung 960 Pro 512GB M.2 SSD (OS), Samsung 850 Pro 512GB SSD, 2TB Seagate SDHD, 2TB WD Green HDD, Gigabyte 3060 12GB VRAM
Gierasimov Posted February 28, 2019 Posted February 28, 2019 (edited) I am getting this during high G turns or when climbing in afterburner. Bags or not, doesn't make difference. Only above 20000 feet though Here as well https://forums.eagle.ru/showthread.php?t=215413&page=2 Edited February 28, 2019 by Gierasimov Intel Ultra 9 285K :: ROG STRIX Z890-A GAMING WIFI :: Kingston Fury 64GB :: MSI RTX 4080 Gaming X Trio :: VKB Gunfighter MK.III MCG Ultimate :: VPC MongoosT-50 CM3 :: non-VR :: single player :: open beta
ricktoberfest Posted February 28, 2019 Posted February 28, 2019 I got this for the first time the other day when I extended the refueling probe. I assumed it had something to do with that as it went away after I retracted it again. Sent from my iPhone using Tapatalk
Nealius Posted February 28, 2019 Posted February 28, 2019 https://forums.eagle.ru/showthread.php?t=215413&highlight=TK+PRES I reported this in July and got no acknowledgement.
bart Posted February 28, 2019 Posted February 28, 2019 I believe this is the fuel tank venting when the probe is out and would be correct behaviour, and the only time I can recall seeing it. I've not noticed it during high g or reheat climbs though. System :- i7-12700K 3.6 GHz 12 core, ASUS ROG Strix Z690-A Gaming, 64GB Corsair Vengeance RGB Pro 3200MHz, 24GB Asus ROG Strix Geforce RTX 3090, 1x 500GB Samsung 980 PRO M.2, 1x 2TB Samsung 980 PRO M.2, Corsair 1000W RMx Series Modular 80 Plus Gold PSU, Windows 10. VIRPIL VPC WarBRD Base with HOTAS Warthog Stick and Warthog Throttle, VIRPIL ACE Interceptor Pedals, VIRPIL VPC Rotor TCS Plus Base with a Hawk-60 Grip, HP Reverb G2.
QuiGon Posted February 28, 2019 Posted February 28, 2019 I've noticed it a few times without extending the probe. Can't remember though what the specific situation was like. Intel i7-12700K @ 8x5GHz+4x3.8GHz + 32 GB DDR5 RAM + Nvidia Geforce RTX 2080 (8 GB VRAM) + M.2 SSD + Windows 10 64Bit DCS Panavia Tornado (IDS) really needs to be a thing!
Direwolf Posted February 28, 2019 Posted February 28, 2019 (edited) NATOPS Warnings Check the NATOPS instructions. Edited April 15, 2019 by NineLine 1.16
Svend_Dellepude Posted February 28, 2019 Posted February 28, 2019 Do you cycle the bleed air knob before takeoff? If not, that might be the cause. AFAIK, after both engines has started you should cycle the bleed air knob through 360°. [sIGPIC][/sIGPIC] Win10 64, Asus Maximus VIII Formula, i5 6600K, Geforce 980 GTX Ti, 32 GB Ram, Samsung EVO SSD.
Nooch Posted February 28, 2019 Posted February 28, 2019 Do you cycle the bleed air knob before takeoff? If not, that might be the cause. AFAIK, after both engines has started you should cycle the bleed air knob through 360°. I thought they were to be cycled only in case you had performed the fire tests, just to get the air conditioning back in the cabin. [sIGPIC][/sIGPIC]
Direwolf Posted February 28, 2019 Posted February 28, 2019 Do you cycle the bleed air knob before takeoff? If not, that might be the cause. AFAIK, after both engines has started you should cycle the bleed air knob through 360°. This warning only appears when IN FLIGHT!
Svend_Dellepude Posted February 28, 2019 Posted February 28, 2019 I thought they were to be cycled only in case you had performed the fire tests, just to get the air conditioning back in the cabin. You might be right. It was pulled from my faulty memory and out of context. Just remember that part from a startup video, but might not exactly remember why it was done. [sIGPIC][/sIGPIC] Win10 64, Asus Maximus VIII Formula, i5 6600K, Geforce 980 GTX Ti, 32 GB Ram, Samsung EVO SSD.
Gierasimov Posted February 28, 2019 Posted February 28, 2019 (edited) What? Bleed air is air conditioning now? Is ECS aircon? I thought I knew ... Edited February 28, 2019 by Gierasimov Intel Ultra 9 285K :: ROG STRIX Z890-A GAMING WIFI :: Kingston Fury 64GB :: MSI RTX 4080 Gaming X Trio :: VKB Gunfighter MK.III MCG Ultimate :: VPC MongoosT-50 CM3 :: non-VR :: single player :: open beta
QuiGon Posted February 28, 2019 Posted February 28, 2019 Do you cycle the bleed air knob before takeoff? If not, that might be the cause. AFAIK, after both engines has started you should cycle the bleed air knob through 360°. I do cycle the bleed air knob every time and I still got the TK PRES LOW warning, but it seems to fit the description in the NATOPS, because I think I was at high altitudes when I got that warning. Intel i7-12700K @ 8x5GHz+4x3.8GHz + 32 GB DDR5 RAM + Nvidia Geforce RTX 2080 (8 GB VRAM) + M.2 SSD + Windows 10 64Bit DCS Panavia Tornado (IDS) really needs to be a thing!
Gianky Posted February 28, 2019 Posted February 28, 2019 Right now I'm at work, so I can't search for the threads I read it from or the NATOPS, but IIRC the cause is bleed air. In my case, I always turn on the de-icing as part of start-up checklist. Both the tanks and the de-icing system use bleed air to work: for tanks, bleed air is used for pressurising them, for de-icing is blown on the interested system (pitot or engine inlets). So, if you have both the de-icing systems working, you have less bleed air to pressurise your tanks, hence the caution warning. At least that's I how I rationalized it, after reading two totally unrelated threads. Opening the fuel receptacle depressurise the tanks, as well.
Scotch75 Posted February 28, 2019 Author Posted February 28, 2019 Right now I'm at work, so I can't search for the threads I read it from or the NATOPS, but IIRC the cause is bleed air. In my case, I always turn on the de-icing as part of start-up checklist. Both the tanks and the de-icing system use bleed air to work: for tanks, bleed air is used for pressurising them, for de-icing is blown on the interested system (pitot or engine inlets). So, if you have both the de-icing systems working, you have less bleed air to pressurise your tanks, hence the caution warning. At least that's I how I rationalized it, after reading two totally unrelated threads. Opening the fuel receptacle depressurise the tanks, as well.Sounds like a good explanation, makes sense. So to re-pressurise, do we reset the bleed air as mentioned earlier? Many thanks to all in the discussion W10 Home 64Bit, Intel Skylake I5 6600K 3.50GHz, ASUS ROG Stryx Z270F MoBo, 64GB G.Skill RipJaws V DDR4 3200 RAM, Samsung 960 Pro 512GB M.2 SSD (OS), Samsung 850 Pro 512GB SSD, 2TB Seagate SDHD, 2TB WD Green HDD, Gigabyte 3060 12GB VRAM
Gianky Posted February 28, 2019 Posted February 28, 2019 I'll be honest with you, I just ignore the warning! :prop: Anyway, if I remember correctly, recycling bleed air is done only because it got shut when you run the Fire & Bleed air test. I think your best bet is to turn off either the pitot or the engine inlet de-icing, but I'd have to check manual and NATOPS to be sure.
Nealius Posted February 28, 2019 Posted February 28, 2019 Anyway, if I remember correctly, recycling bleed air is done only because it got shut when you run the Fire & Bleed air test. The Emergency Procedures section of the NATOPS manual says to cycle Bleed Air if the TK PRES LO warning comes on. 1
Nooch Posted February 28, 2019 Posted February 28, 2019 What? Bleed air is air conditioning now? Is ECS aircon? I thought I knew ... Bleed air (taken from the engine compressor section) is what feeds your ECS. [sIGPIC][/sIGPIC]
Gianky Posted February 28, 2019 Posted February 28, 2019 The Emergency Procedures section of the NATOPS manual says to cycle Bleed Air if the TK PRES LO warning comes on. There we go! Thanks Nealius!
borba_eagle Posted February 28, 2019 Posted February 28, 2019 Same here. Performed the NATOPS procedure and all ok!
=Panther= Posted February 28, 2019 Posted February 28, 2019 I get the deedle on every flight in Nevada, exactly when passing through 19800, clears at 20200. When descending back down for lower altitude, the warning appears at 20200 and self clears at 19800. Twitch Channel [sIGPIC][/sIGPIC] Virtual Thunderbirds, LLC | Sponsored by Thrustmaster Z390 Aorus Xtreme, i9 9900k, G.SKILL TridentZ Series 32GB, 1080ti 11GB, Obutto R3Volution, Thrustmaster HOTAS Warthog, TPR, Cougar MFDs, FSSB R3L, JetSeat, Oculus Rift S, Buddy-Fox A-10C UFC, F/A-18C UFC, Tek Creations F-16 ICP
Rainmaker Posted February 28, 2019 Posted February 28, 2019 Seems to be something that was fairly hard-coded based on the flight manual instead of having some sort of randomizing function.
Flamin_Squirrel Posted February 28, 2019 Posted February 28, 2019 I get this too, always around 20k ft, and suspect this is a bug. At least, if it isn't, I can't see anything that indicates a good reason why it would occur at this specific altitude, and clear when you climb.
AMEDooley Posted February 28, 2019 Posted February 28, 2019 This happens anytime you are between 19,800 and 20,000 ish feet. Just go above or below and you’ll be fine. [sIGPIC][/sIGPIC]
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