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darth_damian_000

Navigation Display Misaligned

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Hello Everyone.

 

The white line on the navigational display screen, which is always supposed to point to the heading at which I am travelling, is slanted. Am I not flying at an angle? Or is this some glitch?

I have saved and loaded this flight a few times. Sometimes, it realigns, but then it goes off center again.

 

Now, I am getting crosswinds at 113 kts, so I don't know of this is the cause. When I loaded the flight, I set active sky in historical mode to reflect the time displayed on the plane's clock.

 

As far as I am aware, I am permitted to post screen shots on this forum as long as they help me explain an issue. I apologize in advance if this violated PMDG rules.

 

But this will paint a clearer picture of what I am talking about:

http://imgur.com/tTXEaYN

 

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You got a big crosswind, and ND displays heading instead of track. EDIT: In fact, you will see the plane flying a bit sideways if you go outside view with such crosswind.

 

Also I am not aware of a no-screenshots policy?

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Yes winds of such speed are possible at that height.if you enable the flight path vector you will see the FPV circle to the left on the PFD.the cross wind from the right is pushing your flight path tothe left.

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Is such a crosswind possible at 37000 feet? I wonder if this is, by any chance, some miscommunication between my previous instance of ASN and the current one (after I loaded the flight).

Definitely possible. At this time of year, jet stream winds can easily exceed 200 knots in the northern hemisphere.

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Definitely possible:

 

NATs.JPG

 

Yeah. Definitely possible.

 

...and this, ladies and gents is why the NATs are so far south at the moment.

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Hello Everyone.

 

The white line on the navigational display screen, which is always supposed to point to the heading at which I am travelling, is slanted. Am I not flying at an angle? Or is this some glitch?

I have saved and loaded this flight a few times. Sometimes, it realigns, but then it goes off center again.

 

Now, I am getting crosswinds at 113 kts, so I don't know of this is the cause. When I loaded the flight, I set active sky in historical mode to reflect the time displayed on the plane's clock.

 

As far as I am aware, I am permitted to post screen shots on this forum as long as they help me explain an issue. I apologize in advance if this violated PMDG rules.

 

But this will paint a clearer picture of what I am talking about:

http://imgur.com/tTXEaYN

You said it yourself.

 

You are heading into the wind in order to follow the LNAV track. 

 

Boeing offers two ND orientations as customer options on all their glass cockpit aircraft. HDG up, which is what you currently have set and TRK up. You can change this via the operations center for a specific repaint, or in the FMC via the AIRCRAFT ---> DISPLAYS menu. 

 

In order to make life simple for operators who chose HDG up orientation, Boeing added a very handy white line that begins at the aircraft symbol (the triangle). This white line represents your track, which is why the aircraft will align that line with the LNAV track when in LNAV mode. HDG will only match TRK in a zero wind or perfect tailwind/headwind scenario.

 

On the other hand, if you set the orientation to to TRK up (Boeing default option) your track will always appear vertical on the ND, as the ND is orientated in TRK mode.

 

Emirates, KLM, Lufthansa, British Airways are some real world operators who purchased the HDG up option for the ND.

 

Cathay Pacific, United Airlines are some of the operators who selected the TRK up option on the ND.

 

I suggest you refer to the FCOM, as it will give you a description of both options and provide further clarity!

 

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