CS 27.1327Â Â Magnetic
direction indicator
ED Decision 2003/15/RM
(a)Â Â Â Â Except as provided in sub-paragraph (b):
(1)    Each magnetic direction indicator must be installed so that its accuracy is not excessively affected by the rotorcraft’s vibration or magnetic fields; and
(2)    The compensated installation may not have a deviation, in level flight, greater than 10° on any heading.
(b)    A magnetic non-stabilised direction indicator may deviate more than 10° due to the operation of electrically powered systems such as electrically heated windshields if either a magnetic stabilised direction indicator, which does not have a deviation in level flight greater than 10° on any heading, or a gyroscopic direction indicator, is installed. Deviations of a magnetic non-stabilised direction indicator of more than 10° must be placarded in accordance with CS 27.1547(e).
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