A320 ENG SHUTDOWN & HYD
Join Date: Mar 2000
Location: Sunrise Senior Living
Posts: 1,338
Likes: 0
Received 0 Likes
on
0 Posts
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
Join Date: Jun 2006
Location: CASEY STATION
Posts: 191
Likes: 0
Received 0 Likes
on
0 Posts
No reference just observation in the simulator. HYD pressure is sufficient to prevent a Pump Low HYD Px ECAM with the engine windmilling if the speed is maintained around 240-250 kts.
Join Date: Apr 2004
Location: United States of Europe
Age: 40
Posts: 502
Likes: 0
Received 0 Likes
on
0 Posts
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.
Join Date: Oct 2010
Location: 5° above the Equator, 75° left of Greenwich
Posts: 411
Likes: 0
Received 0 Likes
on
0 Posts
From FCTM "landing with abnormal landing gear":
.
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
