CS 25.1303 Flight and navigation instruments

• ED Decision 2018/005/R found in: CS-25 Amdt 27 - Large Aeroplanes (Jan 2023)

CS 25.1303 Flight and navigation instruments ED Decision 2018/005/R (a) The following flight and navigation instruments must be installed so that the instruments are visible from each pilot station: (1) A free-air temperature indicator or an air-temperature indicator which provides indications that are convertible to free-air temperature. (2) A clock displaying hours, minutes, and seconds with a sweep-second pointer or digital presentation. (3) A magnetic direction indicator. (b) The following flight and navigation instruments must be installed at each pilot station: (1) An airspeed indicator. If airspeed limitations vary with altitude, the indicator must have a maximum allowable airspeed indicator showing the variation of VMO with altitude. (2) An altimeter (sensitive). (3) A rate-of-climb indicator (vertical speed). (4) A gyroscopic rate of turn indicator combined with an integral slip-skid indicator (turn-and-bank indicator) except that only a slipskid indicator is required on aeroplanes with a third attitude instrument system usable through flight attitudes of 360o of pitch and roll, which is powered from a source independent of the electrical generating system and continues reliable operation for a minimum of 30 minutes after total failure of the electrical generating system, and is installed in accordance with [CS 25.1321(a)](#_DxCrossRefBm1709821575). (5) A bank and pitch indicator (gyroscopically stabilised). (See [AMC 25.1303(b)(5)](#_DxCrossRefBm1709821581).) (6) A direction indicator (gyroscopically stabilised, magnetic or non-magnetic). (c) The following flight and navigation instruments are required as prescribed in this paragraph: (1) A speed warning device which must give effective aural warning (differing distinctively from aural warnings used for other purposes) to the pilots whenever the speed exceeds VMO plus 11.1 km/h (6 knots) or MMO + 0·01. The upper limit of the production tolerance for the warning device may not exceed the prescribed warning speed. (See [AMC 25.1303(c)(1)](#_DxCrossRefBm1709821580).) (2) A mach meter is required at each pilot station for aeroplanes with compressibility limitations not otherwise indicated to the pilot by the airspeed indicating system required under sub-paragraph (b)(1) of this paragraph. [Amdt 25/18] [Amdt 25/21]