Navigation - Beechcraft C-12C Operator And Technical Reference Manual

TM 1-1510-218-10
If another channel is to be reset, use the smaller
concentric knob to select the channel and repeat the
steps.
7. To return to an operating mode,
push the PGM button.
3B-10. EMERGENCY LOCATOR TRANSMITTER.
a. Description.
activated Emergency Locator Transmitter (ELT) is
located in the right side of the fuselage at
approximately FS 340.00. The associated antenna is
mounted on top of the aft fuselage at the same
location, Figure 2-1, Sheet 2. An access hole with a
spring-loaded cover is located in the right fuselage
skin adjacent to the transmitter, enabling a downed
pilot to manually initiate, terminate, or reset the ELT to
an armed mode. Self-contained batteries provide
operation for a minimum of 48 hours.
3B-11. DESCRIPTION.
The overall navigation equipment group provides
the pilot and copilot with the 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.
3B-12. RADIO MAGNETIC INDICATORS (RMI).
a. Description.
indicators are installed. Refer to Figure 3B-5. Each
RMI provides aircraft heading and radio bearing
information to/from a VOR, TACAN or ADF facility. A
selector switch on the RMI allows the operator to
select either #1 ADF and #1 VOR or #1 ADF and
TACAN for single needle display. The double needle
always points to the #2 ADF or #2 VOR bearing as
selected by the double needle switch. The pilot's RMI
is protected by a 1-ampere circuit breaker, placarded
#1 RMI. The copilot's RMI is protected by a 1-ampere
circuit breaker, placarded #2 RMI.
breakers are located on the overhead circuit breaker
panel, Figure 2-16, Sheet 3.
b. Controls and Functions.
3B-12
An automatic or manually
Section III. NAVIGATION
Two identical KNI-582 RMI
Both circuit
The transmitter contains an impact G switch that
automatically activates the transmitter following a 3 to
7 G impact along the flight axis of the aircraft. When
activated, it will simultaneously radiate omni-directional
RF signals on the international distress frequencies of
121.5 and 243.0 MHz.
modulated with an audio swept tone.
b. Controls and Functions.
(1) ON / ARM / OFF Switch.
(a) ON.
emergency signal transmissions.
(b) ARM. Establishes a readiness state
to start automatic emergency signal transmissions
when the force of impact exceeds a preset threshold.
(c) OFF. Turns set off.
(1) Warning Flag. Indicates loss of heading
signal, or that bearing information is unreliable.
(2) Compass Card.
indicate aircraft heading and bearing information.
1. Warning Flag
2. Compass Card
3. Heading Index
4. Double Needle Pointer
5. Single Needle Pointer
6. Double Needle Switch
7. Single Needle Switch
Figure 3B-5. Radio Magnetic Indicator (RMI)
(3) Heading Index.
aircraft heading.
The radiated signal is
Turns set on, initiating
Gyro stabilized to
Reference point for