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Page Title:
Definition of Increasing Positive Angles and Functions |
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|  MIL-N-81497A(AS)
Definition of Increasing Positive Angles and Functions -
3.4.3.4.1
Definitions of increasing positive angles and functions shall be in
accordance with ARINC 407-1 and shall be as follows:
(1) Definition of Zero Reference Position -
180 DEG with respect to the horizon
Roll:
(a)
180 DEG with respect to the horizon
(b) Pitch:
0 DEG with respect to North (mag-
Heading:
(c)
netic or true).
(d) Magnetic Variation: 0 DEG when magnetic heading
equals true heading.
Definition of Positive Increasing Functions/Angles -
(2)
Right side down (viewed from aft)
(a) Roll:
Fore side up
(b) Pitch:
(c) Heading: Right turn
(d) Magnetic Variation: Easterly direction
(e) Velocity: Increasing North or East directions
(f) Doppler Velocities:
Increasing velocity in Fore direction
Increasing rightward (viewed from aft)
velocity.
(g) Altitude: Increasing altitude above sea level.
(3)
Magnetic Variation - Magnetic variation shall be
defined by the following equation.
True Heading = Magnetic Heading + Magnetic Variation
Synchro Outputs - Equipment synchro output transmit-
3.4.3.4.2
ters shall be in accordance with MIL-S-20708 and shall be electrically
zeroed and phased in accordance with the requirements of ARINC 407 and
ARINC 407-1 except as specified herein.
Note
All sychros, unless otherwise noted, shall
be energized in parallel from the aircraft
26V, single phase, 400 Hz source.
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