[Code of Federal Regulations]
[Title 14, Volume 1]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR25.1303]

[Page 454-455]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
 
PART 25--AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES--Table of Contents
 
                          Subpart F--Equipment
 
Sec. 25.1303  Flight and navigation instruments.

    (a) The following flight and navigation instruments must be 
installed so that the instrument is 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 direction indicator (nonstabilized magnetic compass).
    (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).

[[Page 455]]

    (4) A gyroscopic rate-of-turn indicator combined with an integral 
slip-skid indicator (turn-and-bank indicator) except that only a slip-
skid indicator is required on large airplanes with a third attitude 
instrument system useable through flight attitudes of 360 deg. of pitch 
and roll and installed in accordance with Sec. 121.305(k) of this title.
    (5) A bank and pitch indicator (gyroscopically stabilized).
    (6) A direction indicator (gyroscopically stabilized, magnetic or 
nonmagnetic).
    (c) The following flight and navigation instruments are required as 
prescribed in this paragraph:
    (1) A speed warning device is required for turbine engine powered 
airplanes and for airplanes with VMO/MMO greater 
than 0.8 VDF/MDF or 0.8 V D/
MD. The speed warning device must give effective aural 
warning (differing distinctively from aural warnings used for other 
purposes) to the pilots, whenever the speed exceeds VMO plus 
6 knots or MMO +0.01. The upper limit of the production 
tolerance for the warning device may not exceed the prescribed warning 
speed.
    (2) A machmeter is required at each pilot station for airplanes with 
compressibility limitations not otherwise indicated to the pilot by the 
airspeed indicating system required under paragraph (b)(1) of this 
section.

[Amdt. 25-23, 35 FR 5678, Apr. 8, 1970, as amended by Amdt. 25-24, 35 FR 
7108, May 6, 1970; Amdt. 25-38, 41 FR 55467, Dec. 20, 1976; Amdt. 25-90, 
62 FR 13253, Mar. 19, 1997]