TM 55-1510-219-10
Figure 3-13. Pilot's Turn and Slip Indicator (329T- 1)
Inclinometer
Indicates lateral acceleration
(
side slip) of aircraft.
3-21. COPILOT'S GYRO HORIZON INDICATOR.
a.
Description. The copilot's gyro horizon indicator
(fig. 3-14) is a flight aid which indicates the aircraft's
attitude. The indicator is designed to operate through all
attitudes. There are no front panel fuses or circuit
breakers provided for the copilot's gyro horizon
indicator.
b.
Controls and Indicators.
INDICATOR
FUNCTION
Bank angle index
Reference indicating zero-degree
bank.
Bank angle
Indicates aircraft bank angle.
pointer
Bank angle scale
Indicates aircraft bank angle
from zero to 90 degrees with
marks at 10, 20, 30, 45, 60, and
90 degrees.
Horizon line
Affixed to sphere, remains paral-
lel to the earth's horizon at all
times.
Miniature
Indicates attitude of aircraft
aircraft
with respect to the earth's hori-
zon.
G flag
Presence announces loss of pow-
er.
Sphere
Indicates orientation with
earth's axis at all times.
Inclinometer
Assists the copilot in making co-
ordinated turns.
3-22. GYRO MAGNETIC COMPASS SYSTEMS.
a.
Description. Two identical compass systems
provide accurate directional information for the aircraft
at all latitudes of the earth. As a heading reference, two
modes of operation are used: directional gyro (FREE)
mode, or slaved (SLAVE) mode. in polar regions of the
earth where magnetic heading references are not
reliable, the system is operated in the FREE mode. 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
3-24
