TM 55-1510-222-10
b.
Control and Functions.
(1)
RESET switch. When pressed, resets
transmitter.
(2)
Function switch. Selects operating
mode of set.
(a)
ARM. Arms set to be actuated
by impact switch (normal mode).
(b)
OFF. Turns set off.
(c)
ON.
Manually
activates
transmitter for test or emergency purposes.
Section III. NAVIGATION
3-14. 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.
3-15. RADIO MAGNETIC INDICATORS (RMI-30).
a.
Description. Two identical radio magnetic
indicators (fig. 3-7) (RMI) provide aircraft heading and
radio bearing information to or from a VOR, TACAN, or
ADF station. The pilot's and copilot's RMIs are
protected by 1-ampere circuit breakers, placarded RMI
No. 1 and No. 2 located in the overhead circuit breaker
panel.
b.
RMI Controls, Indicators, and Functions.
(1)
Single-Needle Switch-indicators. Two
single-needle pointer switches (placarded with a single-
needle symbol), located on the extreme left and right
sides of the instrument panel (fig. 2-14), are provided to
the pilot and copilot to select which bearing information
source is being used by the single-needle pointer of its
respective RMI. When the switch is in the up position,
placarded VOR 1, the RMI single needle displays
bearing information from the #1 VOR if the single-
needle selector switch on the RMI is set to the
VOR/TACAN position; or information from the INS, if
the single-needle selector switch is set to the INS
position. When the switch is in the down position,
placarded TACAN, the,single needle displays bearing
information from TACAN, if the single needle selector
switch on the RMI is set to the VOR/TACAN position, or
INS if the single-needle selector switch is set to the INS
position.
(2)
Single-needle pointer. The arrow of
this pointer indicates the magnetic heading to a VOR or
TACAN station, or INS bearing to waypoint. The pilot's
single-needle pointer can display bearing information
from VOR 1, TACAN, or the INS, depending upon the
position of the single-needle pointer selector switch on
the RMI, and the position of the single needle switch
(located on the left side of the instrument panel).
The copilot's single needle pointer can display
bearing information from VOR 1, TACAN, or the INS,
depending upon the position of the singleneedle selector
switch on the RMI, and the copilot's single-needle switch
(located on the right side of the instrument panel).
(3)
Lubber line. Aircraft heading is read
from the compass card under the lubber line.
(4)
Heading Warning Flag. The heading
warning flag, located on the upper right portion of each
RMI, comes into view whenever the compass system
determines that the heading information displayed on
the compass card is invalid.
(5)
Double-needle pointer. The arrow of
this pointer indicates the magnetic heading to a VOR or
ADF station.
The pilot's double-needle pointer can display
bearing information from VOR 2 or the ADF, depending
upon the position of the double-needle selector switch
on the RMI.
The copilot's double-needle pointer can display
bearing information from VOR 2 or the ADF, depending
upon the position of the double-needle selector switch
on the RMI.
(6)
Double-needle pointer selector switch.
This is a two-position, press to change, selector switch,
located on the lower right corner of each RMI. When
depressed to the in position, ADF bearing information is
supplied to the double needle, and the double-needle
indicator on the RMI, points to the ADF station.
Depressing the switch when it is in
3-18
