Misalignment??

[Biga42]

It's been quite difficult to land at night, the HSI does not match the runway. Is anyone experiencing this?

 

Thanks!

[Ramsay]

The course heading 260°M looks wrong, if landing at Kutaisi RWY 26.

 

• Kutaisi RWY 26 measures 254°T using the F10 ruler.

• Caucasus MV = 6° E

 

So ...

 

• RWY 26 magnetic heading = 254°T - 6° magnetic variation = 248°M

 

and 248°M is the course setting required for the A-10C HSI

 

Note: There will a be small difference in the ground track to 248°M as the TACAN station is offset to the side of the runway,

Edited November 2, 2018 by Ramsay

[eaglecash867]

The runway markings are hosed. There shouldn't be a 12 degree difference between the runway markings and the magnetic azimuth of the runway. At least, not according to FAA specifications anyway. ;)

[Frederf]

Three different directions: meridians of longitude, ruler, and magnetic field. In real life angle with meridian is true heading. In DCS ruler true heading. The difference between ruler and meridian varies about +-8 degrees depending if you are on right or left side of map.

 

The difference between meridian and what DCS calls true north (ruler) explains it.

[Biga42]

Looking at the kneeboard it states that heading must be 248º. I allways thought that the number of the RWY was the heading...

[NeilWillis]

The runway markings are hosed. There shouldn't be a 12 degree difference between the runway markings and the magnetic azimuth of the runway. At least, not according to FAA specifications anyway. ;)

 

As Kutaisi is not in US controlled airspace, I'd say the FAA has very little say.

 

Runway headings are rounded, there is always a difference between true, grid, and magnetic headings, and they need to be factored in. Magnetic variation is set at 6 degrees E. The visual approach chart that comes with DCS World shows the runway heading as 248/068 degrees.

[eaglecash867]

As Kutaisi is not in US controlled airspace, I'd say the FAA has very little say.

 

Runway headings are rounded, there is always a difference between true, grid, and magnetic headings, and they need to be factored in. Magnetic variation is set at 6 degrees E. The visual approach chart that comes with DCS World shows the runway heading as 248/068 degrees.

 

Yes, runway markings are rounded, and they are based on magnetic azimuth. They are rounded up and down the standard way, giving an extra degree of slop, so they are supposed to be within 6 derees of magnetic azimuth. So, MagVar is already accounted for. This problem is mentioned fairly regularly on these forums, yet in the real world, I have yet to ask a pilot who is having AHRS problems if he remembered to manually account for magnetic variation from true heading. That seems to be the one simple mistake that I never have seen a pilot make in real world flying. Regulatory agencies around the world generally operate from the same set of basic standards for navigation, but the Kutaisi area may be different. But, in general, a 12 degree disparity between magnetic azimuth and runway markings is excessive. :smilewink: