AIRCRAFT MAGNETISM

#1. European regulations (CS Ops-1) state that the maximum permissible deviations after compensation are:

• Aone degree for a remote indicating compass, and ten degrees for a direct reading magnetic compass.
• Bthree degrees for a direct reading magnetic compass, and one degree for a remote indicating compass.
• Cten degrees for a remote indicating compass, and one degree for a direct reading magnetic compass.
• Done degree for a direct reading magnetic compass, and eleven degrees for a slaved compass.

#2. Compass swings should be carried out:

• Aon the apron.
• Bonly on the compass swinging base or site.
• Cat the holding point.
• Don the active runway.

#3. Aircraft magnetism caused by Vertical Soft Iron:

• Avaries with magnetic heading but not with magnetic latitude
• Bvaries with magnetic latitude but not with heading.
• Cit is not affected magnetic latitude or heading.
• Dvaries as the cosine of the compass heading.