Jump to content

Sign in to follow this  
Guest RoniisH

Pack3 Off (PMDG 747)

Recommended Posts

Guest RoniisH

Hi guys. I recently took a flight with the PMDG 747 and used the "pack 2+3 off" before startup, but after the start-up, I cannot turn Pack 3 back on. Pack 2 works fine to turn back on, but pack 3 remains off, even though it's on "NORM" on the overhead.pack3qm1.jpgpacksee8.jpgThanks, Ron.

Share this post


Link to post

Check the EFIS environmental screen to verify it's on then just cancel the annunciation, use the cancel button on the EFIS panel.


Dan Downs KCRP

Share this post


Link to post

A picture of the ECS page on the Lower EICAS would help.Rob


Rob Prest

 

Share this post


Link to post
Guest RoniisH

>A picture of the ECS page on the Lower EICAS would help.>>Rob1234inm.jpgdownscc; Unable to cancel such "white" messages.

Share this post


Link to post

have you tried the pack reset button, or cycling the switch from NORM to OFF?Bryan


Bryan Richards

 

"People depend so much on automation that they forget how to get the automation to work." B.W.

Share this post


Link to post

Have you accidentally armed one of the cargo fire switches?Cheers.Q> Ян

Share this post


Link to post
Guest RoniisH

>Have you accidentally armed one of the cargo fire switches?>>Cheers.>Q> ЯнI might just have! How could that be the cause of it?tcas_climb: Yes, tried them all, didn't make any difference.

Share this post


Link to post

"I might just have! How could that be the cause of it?"Boeing airplane logic... Arming the cargo fire switch shuts down the #3 Pack. Never could make sense of this.... as it also forces the other two packs into hi-flow (in cruise). Surely lots of fresh air means lots of oxygen to fan the fire(???).Cheers.Q> Ян

Share this post


Link to post

Just a quick thought before digging into the 747 systems manual. Does the cabin air go into the cargo compartment? I fly the 737 and no pack air goes into the cargo compartmets on that. Driving the packs to high could be done to get any potential smoke that is in the cabin out quickly. In the 737 the first step in the Smoke/Fumes Removal checklist is to set the packs to high.


Tom Landry

 

PMDG_NGX_Tech_Team.jpg

Share this post


Link to post

"I fly the 737 and no pack air goes into the cargo compartmets on that. Driving the packs to high could be done to get any potential smoke that is in the cabin out quickly."True.. Pack air usually only goes to the lower cargo area on 744 freighters, however, normal flow on the 744 is about 2/3rds of high flow, so you basically end up with the same amout of air with 2 packs at high flow as 3 packs at normal flow. Perhaps it's the distribution that varies? Although the air from the three packs goes into a common plenum, similar to the 737NG, Pack #1 air has a preference for the cockpit area (baffles in the plenum direct the air towards the cockpit). Upper/Lower Recirc Fans are shut down also. This would mean that the cabin and cockpit will be getting roughly the same amount of air as a whole, but fresher. Seems to me, that the pilots would be getting the most benifit, however :(Cheers.Q>

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%
    $540.00 of $25,000.00 Donate Now
×
×
  • Create New...