Sign in to follow this  
Hangman

744 Pre-Release Itch Scratch - Flight Deck Layout

Recommended Posts

Hello all

 

In anticipation for the 744 release I have been doing a little bit of YouTubing and watching the excellent beta videos that have been uploaded. I do have one question which I would normally look up in the FCOM, but unfortunately I haven't got a copy of it.

 

What on Earth is the barber pole that sits on the flight deck coaming directly in front of both pilots? It seems to show up during the takeoff roll then closes off once airborne. Can somebody help me scratch this itch? It has been about 4-5 years since I flew the 747 on FS so am now totally unfamiliar with the type again.

 

Thanks in advance

Share this post


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

It is the Para Visual Display (PVD). It uses the localizer signal to visually aid staying on the runway centerline during takeoff in poor visibility.

  • Upvote 1

Share this post


Link to post
Share on other sites

That's service, 5 minutes later I have an answer. Thank you very much Harm!

 

Kindest regards

Share this post


Link to post
Share on other sites

Fully modeled as an option (two different forms of it in fact) in our simulation as well.

  • Upvote 4

Share this post


Link to post
Share on other sites

Thanks Tabs, I imagine this was only fitted to the earlier frames fitted with the CRTs? I was reading that became fairly obsolete with advances in navigation technology. Lucky I plan on flying the old battered flying scrap freighters so I should definitely come across working examples (again from reading some carriers have deactivated it).

Share this post


Link to post
Share on other sites

It is the thing directly above the PFD that looks like a black and white candy-cane:

 

qfjb_pvd.jpg

Share this post


Link to post
Share on other sites

Thanks Tabs, I imagine this was only fitted to the earlier frames fitted with the CRTs? I was reading that became fairly obsolete with advances in navigation technology. Lucky I plan on flying the old battered flying scrap freighters so I should definitely come across working examples (again from reading some carriers have deactivated it).

 

There's airframes that have both the LCDs and the PVD. (example - the Qantas 400ERs)

  • Upvote 1

Share this post


Link to post
Share on other sites

The PVD, being right up high on the glareshield, would perhaps be more useful than looking down at the PFD and then back up up again when transitioning from instrument to visual in the last few seconds. Also, it does not overwhelm with data, just the basics of left-right of the centerline.

Share this post


Link to post
Share on other sites

It's a great system... until pilots ignore it...  (Google "Singapore Airlines SQ006 and Para Visual Display")

 

... or it breaks down... :Tounge:

 

 

PVDRepair.jpg

 

The system actually receives guidance data from the (Autopilot) Flight Control Computers: The Flight Control Computers mix airplane yaw rate and cross body acceleration (from the IRUs) and localizer deviation and localizer deviation rate to come up with easy to follow commands. :hi:

 

Cheers

John H Watson

  • Upvote 2

Share this post


Link to post
Share on other sites

 

 


... or it breaks down...
Yikes! I wonder if PMDG has modelled that particular breakdown. "Oh, never mind, it always does this"!!

Share this post


Link to post
Share on other sites

The PVD, being right up high on the glareshield, would perhaps be more useful than looking down at the PFD and then back up up again when transitioning from instrument to visual in the last few seconds. Also, it does not overwhelm with data, just the basics of left-right of the centerline.

It is only used for take off, you implied the transition from instrument to visual as in approaches. It is not for that purpose.

Share this post


Link to post
Share on other sites

It is only used for take off, you implied the transition from instrument to visual as in approaches. It is not for that purpose.

Ahh right... surely it would be of benefit on rollout in bad vis though?

 

Does the bar only come alive under takeoff conditions? (One reference I got was "Only be used on ground")

Share this post


Link to post
Share on other sites

It only works on the runway with the ILS/LOC freq/course for that runway set on the NAV RAD page. It will not become active when landing.

Share this post


Link to post
Share on other sites
Does the bar only come alive under takeoff conditions? (One reference I got was "Only be used on ground")

 

 

My manuals say...

 

"Not rollout mode engaged, LOC data valid, course error less than 45 degrees and airplane on ground"

 

.... but you can't always believe your books... They also say "Ground speed more than 40 knots" which is not true (In a video, I've seen it operating at 7 kts)

 

PVDOneDot.JPG

 

Cheers

John H Watson

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