B737ng le cruising depressurization valve
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Joined: Apr 2019
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From: Your heart
B737ng le cruising depressurization valve
as per boeing sds " The LE cruise depressurization function depressurizes the LE flap and slat actuators. This occurs when all the LE devices and the flap lever are at the up position and the airplane is in the air. The FSEU closes the LE cruise depressurization valve when the airplane is in a cruise condition. This valve stops the hydraulic power to the LE flap and slat actuators to prevent extension. "
Normally, the LE Flap/Slat will extend along with the TE Flap. However, the sds mentioned that the FSEU will close the LE Cruise depressurization valve while on cruise, so I'm not quite sure what that means. my question is :
1. So the LE Flap/Slat won't extend in flight even if the TE Flap moves down or extends?
2. Given that the autolslat can only extend the LE from EXTEND to FULL EXTEND during stall, what would happen if the LE Flap/Slat did not extend during cruising? How would it function during stall if it was not extended? Therefore, I think that the le slat/flap would also extend during flight when the flap lever is down other than (UP). Am I right ?
Tried deepseek but it make me more confusedd
can anyone help thank you
Normally, the LE Flap/Slat will extend along with the TE Flap. However, the sds mentioned that the FSEU will close the LE Cruise depressurization valve while on cruise, so I'm not quite sure what that means. my question is :
1. So the LE Flap/Slat won't extend in flight even if the TE Flap moves down or extends?
2. Given that the autolslat can only extend the LE from EXTEND to FULL EXTEND during stall, what would happen if the LE Flap/Slat did not extend during cruising? How would it function during stall if it was not extended? Therefore, I think that the le slat/flap would also extend during flight when the flap lever is down other than (UP). Am I right ?
Tried deepseek but it make me more confusedd
can anyone help thank you
Joined: Sep 2001
Posts: 1,030
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From: Blighty
1. Yes.
2. Why would you want the TE flaps to extend in the cruise?
Stall protection is there for low speed operations not cruise speeds. If you're stalling during the cruise, you've got bigger problems.
Also, there are other logic functions at play.
2. Why would you want the TE flaps to extend in the cruise?
Stall protection is there for low speed operations not cruise speeds. If you're stalling during the cruise, you've got bigger problems.
Also, there are other logic functions at play.
