Text in force at CS29-12: from CS29-0, effective 14 Nov 2003.
(a) Each magnetic direction indicator must be installed so that its accuracy is not excessively affected by t he rot orcraft’s vi bration or magnetic fields.
(b) The compensated in stallation m ay n ot have a devi ation, i n l evel flight, greater than 10° on any heading.
ED Decision 2003/016/RM · Source