TM 55-1510-220-10
Figure 3-15. Copilot's Gyro Horizon Indicator (GH-14)
In this mode, the system furnishes an inertial heading
reference, with latitude corrections introduced manually. In
areas where magnetic heading references are reliable, the
system is operated in the SLAVE mode. In this mode, the
directional gyro is slaved to the magnetic flux detector, which
supplies long-term magnetic reference to correct the apparent
drift of the gyro.
Magnetic heading information from both systems is applied
to various aircraft systems through pilot and copilot
COMPASS No.1 No.2 switches.
There are no circuit breakers for the gyromagnetic compass
systems. The circuits are protected by the 2-ampere F2 and
F6 fuses on the No. 1 junction box.
b.
Vertical Gyro A vertical gyro provides line-of-sight
stabilization to the weather radar and roll and pitch
information to the autopilot. No controls are required or
provided for operation of the vertical gyro system. The circuit
is protected by the 3-ampere F22 fuse in the No. 1 junction
box.
c.
Controls and Functions.
(1)
Pilot's COMPASS No.l-No.2 switch. Selects
desired source for magnetic heading information to display on
pilot's HSI and copilot's RMI.
(a)
No.1. Selects compass system No.1 for
display.
(b)
No.2. Selects compass system No.2 for
display.
(2)
Copilot's
COMPASS
No.l-No.2
switch.
Selects desired source for magnetic heading information to
display on copilot's HSI and pilot's RMI.
(a)
No.1. Selects compass system No. 1 for
display.
(b)
No.2. Selects compass system No. 2 for
display.
(3)
GYRO SLAVE-FREE switch. Selects system
mode of operation.
(a)
SLAVE.
Selects
slaved
mode.
Compass flux gate connect to azimuth card.
(b)
FREE. Selects free mode flux gate not
connected to azimuth card.
(4)
INCREASE-DECREASE switch. Provides
manual fast synchronization of the system.
3-28
