Fuel bugs or my control mistake?

Uhm...I mean.. Sometimes I spawn in a L-39 on the parking lot hot and I open the canopy and ask the ground the service to refuel and rearm.

After I take off, a red warning light showing fuel 150kg on the front left warning light panel is lit and the plane's engine will shut automatically shortly after.

I don't know whether it is a bug or I didn't follow the proper control procedure....I just tried to fly L-39 when I translated its miz files...

The 150 kg fuel warning / engine shut down was introduced in one of the early patches (1.5.3 perhaps?).

It's caused when using near Max throttle (n1=106%) and negative G manoeuvres i.e. pushing the nose down for 5 seconds.

Even after levelling out, the 150 kg fuel warning will remain on and the engine eventually shut down unless the throttle is reduced. Once the throttle is reduced and n1 falls below n1=~90%, the fuel warning will extinguish and normal flight/throttle settings can resume.

There's an aux tank that holds 20s of fuel for inverted flight, that takes another 20s to refill but I haven't read of the behaviour we see in DCS.

Perhaps there's a valve/tank that pressurises with bleed air that will only release when the throttle is backed off. OTOH looking at the T.O. 1T-L39C-1 fuel schematic (figure FO-1), it looks like a bug?

Tested in L-39C/ZA in DCS 1.5.4.57288 (Steam).

The 150 kg fuel warning / engine shut down was introduced in one of the early patches (1.5.2 perhaps?).

 

It's caused when using near Max throttle (n1=106%) and negative G manoeuvres i.e. pushing the nose down for 5 seconds.

 

Even after levelling out, the 150 kg fuel warning will remain on and the engine eventually shut down unless the throttle is reduced. Once the throttle is reduced and n1 falls below n1=~90%, the fuel warning will extinguish and normal flight/throttle settings can resume.

 

There's an aux tank that holds 20s of fuel for inverted flight, that takes another 20s to refill but I haven't read of the behaviour we see in DCS.

 

Perhaps there's a valve/tank that pressurises with bleed air that will only release when the throttle is backed off. OTOH looking at the T.O. 1T-L39C-1 fuel schematic (figure FO-1), it looks like a bug?

 

Tested in L-39C/ZA in DCS 1.5.4.57288 (Steam).

Ah...Got that..

Thanks a lot.. I might have to mind my throttle.....