What to do when the combinet hydraulic system has stopped working?

[Leviathan667]

Following and engagement with 2 Mirages (Normandy map DACT), my plane has been hit by a Magic II missile.

 

• HYD PRESS caution light went on (it is indicating pressure in either engine hydraulic pump is below 2,100 psi)
  
• Pressure in the Combined hydraulic went to 0
  
• Pressure in the flight hydraulic system remained at about 3000 psi
  

 

On my way back to land on the carrier, I tried to lower my gear to no avail. Same thing with the flaps. The wing sweep remained steady at about 56° even when I tried to manually change it to 25°.

 

I did switch the hydraulic transfer pump to shutoff, but to no discernible effect, following the manual:

 

If only one of the hydraulic pumps fail it’s possible to pressurize that system from the other pump via the hydraulic transfer pump. This pump is an omni-directional hydraulically driven pump that can supply either system from the other and will maintain a pressure between 2,400 and 2,600 psi if the driving system is at around 3,000 psi. If one system pressure falls below 500 psi the pump will be secured to prevent pump damage and preserve pressure in the working system. The pump can also be manually disengaged by the pilot.

 

Next, I toyed with the emergency flight hydraulic pump in both low and high modes. Nothing changed. The hydraulic pressure indicator showed them both to be off, no matter what.

 

But I could still steer the plane with great ease and increase/decrease throttle on the engines too (did not try the reheat).

 

I find this to be odd because I could not supply pressure to the secondary systems such as the flaps and the, landing gear.

 

Is there something more I should have done?

 

The debriefing screen did not mention the hydraulic system had been hit.

[Rudel_chw]

Is there something more I should have done?

 

Not sure .. these are the procedures that I have for that emergency, but have not tested them fully yet.

 

https://1drv.ms/b/s!Ai6cuX3YQI26hYZib7KHARDbrIsFiA

[Sublimearrepentido]

I die a lot but I did experience a hydraulic failure getting hit and got back to the carrier. Died trying to wave off though.

I can at least tell youbwhat to do with yourbgear

I lost almost all of it. 2 aphid hits 1 engine out. Plane kept making a SLAM and whinning/spinning down noise every few minutes.

To get your gear down with NO pressure you pull up the little stick in left side of pilot seat.

Then right click on the gear knob. Itll twist weird.

The gear will drop. Id drop the hook and go from there f the rest its a emergency.

Then again... idk if Id listen to me. But thats your gear problem.

[RustBelt]

Yea, you can't make pressure because you blew all your Combined hydraulic system fluid out the hole the Mirage made in your combined Hydraulic system circuit.

 

Combined Hyd ONLY: (driven by Left Engine)

Nose Wheel Steering

Landing Gear extension (Backed up by Emergency extend Pneumatic bottle)

Wheel Brakes (protected by one way valve and accumulator)

Gun Drive

Left Overwing Fairing

Emergency Generator

Left Engine Inlet Ramp

Ram Air Door

Aux Flaps

Inboard Spoilers

Refuel Probe

Flap/Slat Gearbox and High Lift Valve feeding Outboard Spoilers.(backed up with AC Backup pump)

DLC Servo

Speed Brakes

Hook Control

 

Flight Hyd ONLY: (driven by Right Engine)

Pitch Parallel Servo

Right Engine Inlet Ramp

Right Overwing Fairing

 

Redundant to Both Systems:

Pitch Series Servo

Roll Series Servo

Yaw Series Servo

Hydraulic Transfer Pump

Both Rudder Actuators

Both Stabilizer Actuators

Wing Sweep

[Sublimearrepentido]

Hey whats ram air do?

[RustBelt]

Emergency forced air for cooling both the crew and forced air cooled electronics if the bleed air driven system stops working.

[Sublimearrepentido]

Thanks.

So when I set the air source it doesnt.. seem to matter.

Ive flown a sortie with ram air the entire time.

Of course i put 2 engines but I want to learn more about the functionality aspects

[Sublimearrepentido]

Also if some one could help me out. Landong using tacan on the vdi whats the course knob top right for? I started setting it to what the carrier says the runway js as its the course the carrier is for. Is rhat correct or?

[RustBelt]

Well since DCS doesn't model any real pressure problems other than You didn't turn oxygen on so you passed out. If you had oxygen on nothing would behave diffrent in the DCS cockpit.

 

As for cooling, again it's probably a yes or no thing in DCS so any cooling was cooling even though Ram air would not be the ideal way to force air cool things for long periods of time under normal operating loads, you want to ideally run off the engine bleed air passed through the heat cycler but in DCS it probably makes little to no difference.

[mattag08]

In those situations use the emergency gear/hook release, so at least you can successfully land.