Bouli306

The Hydrazine light will come on when the system demands Hydrazine. So momentarely at startup of the EPU (pilot will most probably not notice this) together with the AIR light. When there is enough bleedair only the AIR light should be seen. Then when the pilot throttles back for example and bleed air is insufficient to run on bleed air the Hydrazine light will illuminate indicating the system demands Hydrazine to stay on the correct RPM. So with an engine flameout the AIR & Hydrazine lights illuminate... Once again: the AIR light is always on when the system is triggered and functioning properly

1st:'rather than sparking up the Hydrazine motor' 2nd: copy 3rd: copy and copy 4th: no, you said only air light should come on.. 5th: 'but in the event of no engine, you would fire up the JFS to keep the engine spinning at 20% to make sure that the life of the emergency power is extended.' It is not about a win but about correct information. I have flown lots of backseats as I am an F-16MLU flight sim instructor. I know the systems quite well and spoke lots of pilots who have flown with a running EPU. The F-16MLU does not have a stby gen, so when the main gen fails the EPU will start directly

yep and the weight of the rack/pylon is not in the dry weight of the ctl tank/

Not really something wrong: 2113 total weight ctl tank with 1860ish pounds of fuel: 2113-1860= 253 pounds. Add another 100lbs inusable fuel and it computes...

Sorry mate you made some misinterpretations here: 1st: the EPU contains of only one turrbine..either run by Hydrazin, air or both...So there is no seperate 'hydrazin motor' and with a windmilling engine there is no bleed air available/at all to run the EPU. 2nd: the LP compressor does not supply bleed air for the EPU...actually none at all. It is (for the EPU) 13th stage bleed air coming from the High pressure compressor 3rd: the EPU will always start on Hydrazin! Except for the ground test. That means that it will always use some hydrazin. Whenthere is enough bleed air it will take over with that. If not it will keep on running on hydrazin 4th: the hydrazin and air lights illuminate when the systems demands that medium. Air is always demanded so that light is always on when operating. The HYDZN light only illuminates when the system demand hydrazin 5th: When the engine is not operating and you are gliding the jet. The JFS may be started to relieve the EPU a little bit by running the hydraulic A pump, it is not started to run the engine.

Totally right! The EPU will always start on hydzn and take over with bleed air if possible. When using the TEST switch the EPU only runs on bleed air.

1860lbs of fuel for a ctl tank filled with JP-8

The answer on your question is no. Normally you woyld be able to use expand on the HSD but not northside up

Why you want to do this? Freeze will not do this either. It is not a function IRL.

Are you slewing the pod or the HUD. Is the TGP SOI wgen slewing?

You still have 75 seconds of braking action.

Not true..also on ground when there is a multiple grn fail or dual hydraulic fail OR the pilot selects EPU sw ON the epu will start always with Hydrazin and when bleed air is available will try to run on bleed air when available... Engine OFF is no bleedair so the EPU will run in socalled monoptopellant mode ergo on Hydrazine only.

But IRL would start the EPU

Switch in norm, EPU should not fire on the ground if everything is okay. But when both generators fail or bith hydraulic A and B are below zero, will fire in the air if both generator fail and A and B system pressure below 1000 psi. Switch to off, In air will turn the EPU off in all cases except both generators still offline. When they are reset you can shut it down. When going airborne with switch in off the EPU will not fire automatically even when going to NORM. Switching the switch norm to off will not fire the epu..only on will do that. It is A & B system. End yes it should remain on after landing

Your statement is not completely correct: with WOW and throttle below idle the EPU will also not fire. SO in case of engine shutdown without the EPU safety pin installed the EPU will not fire when the throttle is below idle and WOW is triggered

That last statement is not true. On the ground with the EPU safetypin removed..placing the EPU switch to ON WILL fire the EPU. Also when ground ops done with the switch in NORM when the Main and STBY gen fail or both hydraulics drop below 1000PSI the EPU will also fire.

WIP

Not true: When the switch is out of NORM the Bingo fuel is triggered when total fuel decreases below the set value. When the switch is in NORM it is the fuselage fuel which triggers the Bingo fuel warning at set value.

+1 this is not correct. Because of this nose authority during roll in from downwind is very limited.

Now that is a good question!

VRP maybe?

The totalizer (digits) show the total fuel (internal + external). The pointer will depend on your fuel knob: In NORM pointers show fuselage fuel only (no internal or external wing tanks): - AL pointer shows total of A1 tank and Aft reservoir tank - FR pointer shows total of F1, F2 and FWD reservoir

The Viper is started by the Jet Fuel Starter (JFS), this is a small gas turbine engine and makes a hell of a noise. It produces around 400HP. At the moment you place the start switch to ST-I only one accumulator will open the JFS doors, and start to run the JFS up in RPM by a Hydraulic Start Motor. ST-II will use two accumulators to do this. Eventually fuel will be injected and the JFS will start. When it is running it will light up the run light. Than the JFS will run the core engine (high pressure compressor and turbine) via clutches in the Accessory Drive Gearbox (ADG), the Power Take Off (PTO) shaft, the Engine gearbox and the towershaft. Because of the airflow the Fan and Low pressure turbine wil start to rotate as well. Because compressors are really effective a gas turbine will not start very well without bleeding some high pressure air coming from the compressor. In the Pratt & Whitney it is not done via a bleed valve but via a bleed strap. I do not know how the GE works..but i think they do the same thing. When the throttle is moved out of cutoff igintion and fuel is provided. Once the Engine RPM is around 18% the Brake/JFS accumulators as they are called are starting to be refilled. When the RPM is around 50% the JFS automatically switches off (only on the ground).

Although it is in Betties vocabulary when you press her white button i know for a fact that some Vipers do not use the Lock aural cues.

It is the acceleration that tilts the compass.