TM 55-1510-219-10
Section III. NAVIGATION
3-16. DESCRIPTION.
The navigation equipment group provides the pilot
and copilot with instrumentation required to establish
and maintain an accurate flight course and position, and
to make an approach on instruments under Instrument
Meteorological Conditions (IMC). The navigation
configuration
includes
equipment
for
determining
attitude, position, destination range and bearing,
heading reference and groundspeed.
3-17. RADIO MAGNETIC INDICATORS (RMI).
a. Description. Two identical Radio Magnetic
Indicators (RMI) are installed, one for the pilot and one
for the copilot (fig. 3-9). Each unit serves as a
navigational aid for the respective user and, by means
of individual source select switches will display aircraft
magnetic or directional gyro heading and VOR, TACAN,
INS or ADF bearing information. The pilot's RMI is
protected by the 1-ampere #1 RMI circuit breaker on the
overhead circuit breaker panel (fig. 2-26) and the 1.5-
ampere F13 fuse on the No. I junction box. The
copilot's RMI is protected by the 1-ampere #2 RMI
circuit breaker on the overhead circuit breaker panel and
the 1.5-ampere F9 fuse on the No. 1 junction box.
b. Controls and Indicators.
(1) Switches (fig. 2-28).
INDICATOR
FUNCTION
Pilot's
Selects desired source of magnet-
COMPASS No.
ic heading information for dis-
1/No. 2 switch
play on pilot's HSI and copilot's
RMI.
No. 1
Selects compass system No. 1
for display control.
No. 2
Selects compass system No. 2
for display control.
Copilot's
Selects desired source of magnet-
COMPASS No.
ic heading information for dis-
1/No. 2 switch
play on co-pilot's HSI and pilot's
RMI.
No. 1
Selects compass system No. 1
for display.
No. 2
Selects compass system No. 2
for display.
RMI select
Selects which of two signals will
switch
be displayed on respective RMI
single needle pointer, if single
Figure 3-9. Radio Magnetic Indicator (RMI) (332C-10)
3-18
