TM 55-1510-222-10
Figure 3-11. Copilot’s Gyro Horizon Indicator (GH-14B)
b.
Vertical Gyro. A vertical gyro provides line-
of-sight stabilization to the weather radar and roll and
pitch information to the autopilot. A FAST ERECT
switch at the top of the pilot's instrument panel (fig. 2-
14) provides a means for fast erection of the gyros.
Pressing and holding the FAST ERECT switch will erect
the gyro to within 1. 0° of pitch and roll within 60
seconds of power application, and erect to within 0. 5°
within 2 minutes. Normal operation of the vertical gyro
system will not require use of the fast erect switch.
c.
Controls and Functions.
(1)
Pilot's COMPASS No. 1 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. 1 No. 2
switch. Selects desired source for magnetic heading
information to display on pilot's RMI and INS, and
copilot's HSI.
(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 valve connects to azimuth card.
(b)
FREE. Selects free mode.
Flux valve is not connected to azimuth card.
(4)
INCREASE-DECREASE
switch.
Provides manual fast synchronization of the system.
(a)
INCREASE.
Causes
gyro
heading
output
to
increase
(move
in
clockwise
direction).
(b)
DECREASE. Causes gyro heading
3-26
