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Inverted Flight Tanks


Toni Carrera
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Is there some mechanical reason why when I fly inverted for more than about 20 seconds the plane shuts down. Both engines flame out and won't restart.

 

I know it is not common practise to fly in such a manner but I was just curious.

 

IR

Toni Carrera (Ice Rhino)

 

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Is there some mechanical reason why when I fly inverted for more than about 20 seconds the plane shuts down. Both engines flame out and won't restart.

 

I know it is not common practise to fly in such a manner but I was just curious.

 

IR

 

From DCS A-10C manual p. 133 "Note: For negative G flight, the A-10C has collector tanks that will supply the engines with sufficient fuel for 10 seconds of operation at MAX power. If you fly at negative G for more than 10 seconds, you risk the engines shutting down due to lack of fuel supply."

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They do restart. Put the aircraft upright again, then shut off the throttles to the engines. Spool up the APU. Once it is at 100% then move the first throttle to idle and wait for the start up cycle to run through. Then do the same on the other engine. If one engine is still running I think you can use bleed air from it to start the other one but it is a while since I have done this. You won't need the APU for that.

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They do restart. Put the aircraft upright again, then shut off the throttles to the engines. Spool up the APU. Once it is at 100% then move the first throttle to idle and wait for the start up cycle to run through. Then do the same on the other engine. If one engine is still running I think you can use bleed air from it to start the other one but it is a while since I have done this. You won't need the APU for that.

 

Yeah if you have one running the easiest way (in my opinion) is to go into a dive, turn the Bleed Air switch off, flip the Crossfeed switch to Crossfeed, wait for the ITT to get below 150C, then set both throttles to Max and set the Engine Operate switch of the engine you're trying to light to IGN. Once it's up and running pop it back to NORM and turn the Crossfeed to off and the Bleed Air to on.

 

That one has never failed to work for me even when I haven't done it exactly right. Once I forgot to set my throttle back (I had shut it down to kill the engine for practice) and I ran out of room to dive but the engine did start when I kicked the throttle to Idle.

 

The APU mid-air restart is harder for me to get although I've done it.

 

But you're correct about the single engine and both engines with the APU.

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I believe for a proper APU start of the engine(s) after a flame out you need to set the Engine Operate Switch for the affected engine to MOTOR. This purges unspent fuel from the engine, and failing to do so could cause the engine to not ignite correctly. Also make sure you actually shut it off behind the Cutoff detent before trying to restart the engine. Switch the Operate Switch from MOTOR to NORM once the engine restarts.

 

Gryphon pretty much has the windmill restart procedure down.

Warning: Nothing I say is automatically correct, even if I think it is.

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I believe for a proper APU start of the engine(s) after a flame out you need to set the Engine Operate Switch for the affected engine to MOTOR. This purges unspent fuel from the engine, and failing to do so could cause the engine to not ignite correctly. Also make sure you actually shut it off behind the Cutoff detent before trying to restart the engine. Switch the Operate Switch from MOTOR to NORM once the engine restarts.

 

Gryphon pretty much has the windmill restart procedure down.

 

I think you are correct about that. I may be mistaken but I think you could have a hot start if you don't motor them. I have to hold my TM Warthog engine op switches to motor them. They won't stay in that position although they will stay in the IGN position.

 

Good point though on the Motor setting and setting the throttles behind the detent.

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. I have to hold my TM Warthog engine op switches to motor them. They won't stay in that position although they will stay in the IGN position.

 

.

Mine will stay in motor but have to hold in IGN position, exactly opposite.

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From the A-10A Flight Manual

 

Two engine operate switches (figure 1-4), one for each engine, are located on the engine control panel. These switches are placarded ENG OPER Land R, with each switch having three positions placarded IGN, NORM. and MOTOR. The switches are spring-loaded from IGN to NORM positions. The switches must be raised when moving between NORM and MOTOR. Momentarily placing the engine operate switch to IGN will supply ignition to the corresponding engine for 30 seconds regardless of the throttle position or engine core rpm. NORM is used during normal engine operation and for engine starting. MOTOR is used for air-purging of excessive fuel, cooling the engine or manual starting. When the switch is moved to MOTOR the following actions are accomplished, provided electrical power and an air source are available:

 

• ATS valve opens causing the ENG START CYCLE light to come on

• ECS shutoff valve closes

• Both engine bleed air shutoff valves open.

 

NOTE

 

• The throttle must be in OFF or IDLE in order to motor the engine.

The engine operate switches are powered by the DC

essential bus.

 

Seems you don't need to hold the IGN switch.

Warning: Nothing I say is automatically correct, even if I think it is.

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