CS-VLA 1327 Magnetic direction indicator
ED Decision 2003/18/RM
(a) The magnetic direction indicator required must be installed so that its accuracy is not excessively affected by the aeroplane's vibration or magnetic fields.
(b) The compensated installation must not have a deviation in level flight, greater than 10° on any heading except that when radio is transmitting the deviation may exceed 10° but must not exceed 15°.
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