HDG HLD breaking LNAV

Sim Update 13 Beta Aircraft & Systems
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1

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Are you using Developer Mode or made changes in it?

No

Which aircraft are you using that experiences this issue? 787-10

Brief description of the issue:

HDG HLD Caused LNAV to become inactive and wouldn’t reactive.

Provide Screenshot(s)/video(s) of the issue encountered:

Detailed steps to reproduce the issue encountered:

I had this issue today. However I DO NOT have the HD mod installed.

I had just departed from KEWR on the EWR4 departure off 4L. As I was climbing and had turned to heading 290, past the TEB 4/DME. I selected HDG HLD. When I went to select direct NEWEL per my route and selected LNAV the FMS would skip the waypoint and make the waypoint wftrt active. Manually changing NEWEL didn’t allow me to make it active. Then the LNAV would never engage. HDG SEL worked. But I think there’s a bug with HDG HLD causing the route following to stop.

PC specs and peripheral set up:

4K , AMD Ryzen 7800X3D, RTX4080, 64GB

Are you using DX11 or DX12?

DX12

Are you using DLSS?

Yes

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Do you have the same issue if you follow the OP’s steps to reproduce it?

Provide extra information to complete the original description of the issue:

Are you using DX11 or DX12?

Are you using DLSS?

If relevant, provide additional screenshots/video:

2

I’m trying to figure out why you are using HDG HOLD at all. Generally I always enable LNAV and VNAV before taking off. If one or the other don’t light up, it usually means there is something wrong with my flight plan in the FMC.

On flying this particular departure I enable the autopilot around 1,000 ft. The LNAV flies this departure perfectly. When reaching VECTORS, if no ATC instructions have been issues the aircraft continues on its heading as if HDG HOLD is used. Once ATC instructions to the next waypoint are issued, I just go direct to that waypoint. The FMC calculates a new flight path to the waypoint and we are on our way as soon as the green EXEC button is pressed.

VECTORS are common in the US for SIDs and STARs giving ATC the ability to reroute around traffic and weather. But they are relatively new to MSFS. Before I learned how to fly them correctly, my aircraft would fly on a heading into the next state before I’d do something. Now if I don’t hear any ATC instructions immediately after VECTORS, I request them from ATC.

1 Like
4

Do you have the same issue if you follow the OP’s steps to reproduce it?

Yes

Provide extra information to complete the original description of the issue:

Also could not erase waypoints or activate/direct to other legs

Are you using DX11 or DX12?

DX12

Are you using DLSS?

Yes

If relevant, provide additional screenshots/video:

Autopilot stuck in HDG SEL and won’t pickup magenta when crossed with LNAV active

5

Well, EWR4 departure states that when departing from 4L you turn to heading 060 after departure. Then at 4.0 DME of TEB you fly heading 310. If you’re manually flying the aircraft. It’s a good way to just have the FD hold the heading.

Either way, this isn’t a conversation about how to follow a procedure or how use the systems. Each pilot will use different tools in the aircraft depending on the job he’s trying to complete.

The aircraft won’t engage to follow the LNAV in certain scenarios and won’t allow you to direct to a waypoint after radar vectors.

6

Are you heading towards the next waypoint? Lnav will only re-engage when the aircraft nose is pointing in the direction of the next waypoint. It wont re-engage if you are too far off-track/off course.

7

Yes. The issue is not an intercept issue. It’s the FMS that seems to fail re-engaging in lateral navigation. Even selecting the next waypoint as a direct to will not work as the FMS immediately deletes the waypoint. It reminds me of the old TP waypoint issues in the early days of MSFS when going direct to a waypoint we sometimes a nightmare.

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8

I understand that LNAV won’t engage if too far off the flight path. I am confused about LNAV “DIRECT” not flying directly to a waypoint whether or not after VECTORS.