A320 ENG SHUTDOWN & HYD
Joined: Mar 2000
Posts: 1,337
Likes: 1
From: Sunrise Senior Living
Good question!
If we have the APU running and the YLO Elec Pump ON, the all is sweetness and light (hydraulically).
However, I assume you were wondering how long a windmilling engine will produce hydraulic power provided of course the Fire Pbs have not been activated.
On reducing IAS for a SE approach with one engine shutdown (Fire Pb not pressed) the PTU will begin to take over hydraulic duties around GD speed.
I’m sure others will chip in too with their experiences in the sim.
Cheers
mcdhu
If we have the APU running and the YLO Elec Pump ON, the all is sweetness and light (hydraulically).
However, I assume you were wondering how long a windmilling engine will produce hydraulic power provided of course the Fire Pbs have not been activated.
On reducing IAS for a SE approach with one engine shutdown (Fire Pb not pressed) the PTU will begin to take over hydraulic duties around GD speed.
I’m sure others will chip in too with their experiences in the sim.
Cheers
mcdhu
Joined: Apr 2004
Posts: 509
Likes: 3
From: United States of Europe
Around 5% N2 windmilling is enough for the EDP’s to stay running. As mcdhu posted you will lose that windmilling at about green dot. Expect the PTU to start kicking in intermittently with transient ECAM cautions.
Joined: Oct 2010
Posts: 422
Likes: 5
From: 5° above the Equator, 75° left of Greenwich
From FCTM "landing with abnormal landing gear":
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As a reverse-engineering method to check how much N2 do you need to get hydraulic pressure, as setting the parking brake after pushback will deplete some pressure from the accumulator, if you don't recharge the accumulator and start No2 keep an eye on the triple indicator, notice when it moves up and then check N2. Now you will know. If I'm not mistaken, N2 above 10-ish will give pressure
Considering a realistic hydraulic demand, the hydraulic power remains available up to approximately 30 s after the shut down of the related engine
As a reverse-engineering method to check how much N2 do you need to get hydraulic pressure, as setting the parking brake after pushback will deplete some pressure from the accumulator, if you don't recharge the accumulator and start No2 keep an eye on the triple indicator, notice when it moves up and then check N2. Now you will know. If I'm not mistaken, N2 above 10-ish will give pressure
