Jump to content

Sign in to follow this  
Guest pierre974

Outflow valves L and R

Recommended Posts

Guest pierre974

Hi there,can someone explain the functionality of the Man Outflow L and R ?Should it be off ? When should it be turned on ?Last night I had some trouble with it and had to follow the abnormal procedure to manually close the valves...Need some expertise :-zhelp

Share this post


Link to post
Guest Just747-400

Cabin pressurization is controlled by regulating the discharge of conditioned cabinair through the outflow valves.Two outflow valves are installed at the rear of the cabin. The valves normallyoperate in parallel. Cabin altitude and full ventilation rates can be maintained byeither valve.There are two cabin altitude controllers, A and B. Each controller controls bothoutflow valves.Positive and negative pressure relief valves protect the fuselage against excessivepressure differential.The pressurization system has automatic and manual operating modes.In MAN, FMC altitude information is bypassed and the cabinaltitude controller uses internal rate schedules to control cabin altitude. Landingelevation limits are 1,000 feet below sea level to 14,000 feet above sea level.If both Outflow Manual switches are ON, all automatic cabin altitude controlfunctions are bypassed. For this configuration, one pack is selected off to ensurecabin doors may be opened regardless of the position of the outflow valves if anemergency evacuation is required immediately after landing.

Share this post


Link to post
Guest pierre974

Thanks for this accurate answer :-cool

Share this post


Link to post

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  
  • Tom Allensworth,
    Founder of AVSIM Online


  • Flight Simulation's Premier Resource!

    AVSIM is a free service to the flight simulation community. AVSIM is staffed completely by volunteers and all funds donated to AVSIM go directly back to supporting the community. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. Thank you for your support!

    Click here for more information and to see all donations year to date.
  • Donation Goals

    AVSIM's 2020 Fundraising Goal

    Donate to our annual general fundraising goal. This donation keeps our doors open and providing you service 24 x 7 x 365. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. We reset this goal every new year for the following year's goal.


    2%
    $680.00 of $25,000.00 Donate Now
×
×
  • Create New...