Sign in to follow this  
rondon9898

Pack Item on Checklist

Recommended Posts

Hi chaps,

 

Can I just ask why the PACKS.........OFF item on the secured normal electronic checklist in the PMDG 777 isn't a closed loop item, whereas the item is closed loop in the abnormal checklist during a pack failure/overheat? I'm sure there's some reason for  it  but I don't quite understand the difference.

 

Cheers!

Share this post


Link to post
Share on other sites
Help AVSIM continue to serve you!
Please donate today!

The abnormal condition wants the packs kept off possibly to prevent damage to them, pack failure/overheat can be caused by something that a "reboot" is not going to fix.

Share this post


Link to post
Share on other sites

But surely the secured checklist wants the packs kept off too, if the procedure is to have them shut down when securing the aircraft?

Share this post


Link to post
Share on other sites

 

 


But surely the secured checklist wants the packs kept off too, if the procedure is to have them shut down when securing the aircraft?

 

You missed the point, sure they will be kept off normally; however, if for whatever reason you wanted to turn them on it is unlikely to break anything or start a fire so there is no reason to include the "do not do this" instruction.

Share this post


Link to post
Share on other sites

I do get what you're saying Dan, but my question is why can the EICAS detect that the Pack switches have been turned off in an abnormal checklist, but it can't detect that the packs have been switched off in the normal Secured checklist?

Share this post


Link to post
Share on other sites

If for some reason you don't want to switch the packs off, for example airline SOP, or its very hot on the ramp and you need to leave the packs running, then a manual check signifying the pack switches are as required is fine and means you don't have to override the checklist to complete it.

 

Without an air source the packs will be off after shutdown anyway. Switching them off makes sure that when air pressure is connected the packs don't run automatically. With an in flight failure there will be reasons why the pack must be switched off.

Share this post


Link to post
Share on other sites

I understand now Kevin. Thanks for that.

By the way, if it were SOP to keep the packs running, could an airline in the real aircraft customise the pack item to make it automatic/closed loop in the Secured checklist? Am I right in thinking that the checklists in the real aircraft can be tailored to company requirements? Or could they, for example, tailor it to have an 'As Required' rather than 'Off' response on the electronic checklist? This is just an aside - I understand the answer to my first question now.

Share this post


Link to post
Share on other sites

I understand now Kevin. Thanks for that.

By the way, if it were SOP to keep the packs running, could an airline in the real aircraft customise the pack item to make it automatic/closed loop in the Secured checklist? Am I right in thinking that the checklists in the real aircraft can be tailored to company requirements? Or could they, for example, tailor it to have an 'As Required' rather than 'Off' response on the electronic checklist? This is just an aside - I understand the answer to my first question now.

I don't know for sure, I was just giving reasons why it might not be a closed loop check in this case. However FCOM 1 provides a clue in Supplementary Procedures, page SP.16.15.

 

Do the normal Secure Procedure with the following modifications:

 

If the airplane will be attended

 

PACK Switches.......................AUTO    F/O

 

So there are occasions where the check is changed.

Share this post


Link to post
Share on other sites

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