reported TK PRES LO above 20k feet with empty centerline tank

This is consistent behavior when I fly above 20,000 feet with a centerline tank. When the tank is empty, or close to empty, I will get a TK PRES LO warning. NATOPS lists this warning as an emergency situation, and thus I have a hunch that it probably shouldn't be happening with such regularity. I noticed that it also does not happen with empty/near empty wing bags at the same altitudes.

Have you tried switching on override? Doesn't mean there's no problem, but would be interested to know what happens.

I'll give it a go myself this evening if I remember.

Just reproduced. Track is too big to upload through the forums, so uploading here.

It happens specifically at 20,000 feet. After I pass Waypoint 1 in this mission, you will see me ascend/descend through 20,000 feet a number of times in rapid succession. Every time, except for the last time, I get an intermittent TK PRES LO warning.

Have experienced this aswell.

Just flew with a C/L tank and didn't get a warning when it was drained above 20k.

What were your mission parameters; airborne, hot/cold start, did you drain the fuel then go over 20k, or were you at 20k first?

Last time I saw it happen I was just flying around w a wingman using the same loadout. We we’re around 10k feet I think. I got the warning and he didnt. Same fuel state, same altitude. I “think” we were using 2 wing tanks vs a centerline. No idea what triggered it and I havent seen it again.

Just flew with a C/L tank and didn't get a warning when it was drained above 20k.

 

What were your mission parameters; airborne, hot/cold start, did you drain the fuel then go over 20k, or were you at 20k first?

Occurs in both cold start and hot ramp start. Tank ran dry during climbout, as I started off with about 65% fuel.

Rgr, will try again this evening.

Still nothing here either. Strange. Will keep an eye open for it though.

Are you referencing the pocket guide for the caution? Remedy is cycle bleed air switch. If you have it an no one else seems to be getting it, I would check the ECS switch positions when you get it again, perhaps you have a key bind or something that is messing with the airsoirce or the dump switch.

Just a thought.

Bleed Air is set BOTH when it occurs. The warning flashes momentarily when passing through 20,000 feet, only staying on for a fraction of a second before disappearing.

I am consistently getting the TK PRES LO warning as well. I noticed that it started appearing along with the INLET ICE warning after the July 6 update to 2.5 Open Beta.

I am still getting this as of 22AUG, on the latest Open Beta branch. It happens specifically at 20,000 feet, and if I fly precisely at 20,000 the warning will remain on, even if I reset Bleed Air as per Emergency Procedures in the manual. When passing below 19,900 feet or above 20,100 feet the warning will extinguish.

Correction, it occurs between 19,980 feet and 20,060 feet. Even with 510lbs of gas left in the tank.

I am still getting this as of 22AUG, on the latest Open Beta branch. It happens specifically at 20,000 feet, and if I fly precisely at 20,000 the warning will remain on, even if I reset Bleed Air as per Emergency Procedures in the manual. When passing below 19,900 feet or above 20,100 feet the warning will extinguish.

 

Correction, it occurs between 19,980 feet and 20,060 feet. Even with 510lbs of gas left in the tank.

I can confirm as well. TK PRES LO warning is reproducible every time while transitioning through these altitudes.

The Error ist still existing, it can be fixed with cycling the bleed air knob and pull the bleed air aug knob but thats not how it should work,...

The official FA 18 C Pocket Checklist statet

"

INFLIGHT

1. Bleed air switches – CYCLE

If caution remains or reappears -

2. Do not exceed 0.9 Mach in dive

"

And how the horet bleedair system is build it dont makes much sense, to pull the aug knob.

If you look up the NATOPS, you will find a diagram of the Air-System, the Aug Pull switch should only open a valve to a ( in midair ) non or low pressurized system thats used from the APU und Ground Air

I've seen the tank pressure low warning many times in MP but oddly enough ONLY on the default Caucasus map. Have flown many a Nevada/Persian Gulf/Syria map but have never seen this there. Also haven't ever seen any kind of negative effect with the error so have just ignored it.

As for today, still present.

Center line tank empty (and more than 5k lbs of fuel left on the aircraft) and the tank pressure appears at 20k ft exactly.

As soon as you go down or up a few feet it goes away.

The track file is too big since it appears on a BFM Agressor campaign solo mission over Nevada.

Definitely a bug.

A short track is difficult to get since the center line tank has to be empty and there is no option to select it empty on the mission editor (like the Tomcat I believe).

Anyway, empty it, and put your Hornet at 20k exactly with the BarAlt hold and you'll hear the alarm.

I've been doing the Agressor BFM Campaign the last few days and it never fails when I get to 20k sharp with the center line ext tank empty.

Does the centreline tank have to be empty?

3 full tanks, takeoff, full burner climb to 30k, and I hear it passing 20k too. Happens on the way back down as well.

Weird.

In my case it happens when the centerline tank is empty.

When I go to the training range the tank still has fuel and I don't have the alarm.

But when I come back the tank is empty and I get the alarm holding or crossing 20k up or down.

I did not tried with the large bags though.

Just poking in the dark: sure your probe was fully closed?

This alert shows every damn time when you fly at 20k ft. Regardless of tanks.

@RoxSy just set in ME main tank at 50%, when you start mission fuel from drop tank will be transfered to main tank.

Im wondering whats causing this bug now, because TK PRES LO indicates low tank pressurization above 20,000ft. And I don't think it can be a coincidence that thats where the bug occurs. I wonder if ED have attempted to model some tank pressurization system and its mis calibrated or something 

According to the NATOPS (section 2.2.2.1), the TK PRES LO caution should display when the internal tanks are depressurized above 20kft. So the 20kft portion is correct, but I guess the question would be why is the system thinking the internal tanks are being depressurized. Depressurization should occur with the probe extended or the hook & gear handles down.