TM 55-1510-215-10
(2) STBY display. A standby frequency (if
When an ILS frequency is entered, with the system
selected) will display in the STBY window.
in a VOR mode, the system will automatically go to the
ILS mode. When the ILS frequency is removed, the
(3) Frequency selector knobs. The outer
system will revert back to the VOR mode it was in
knob tunes the MHz portion of the frequency. The
previously. Some TACAN channels correspond to ILS
smaller knob tunes the kHz portion in 50 kHz steps. By
frequencies. Selecting a TACAN mode will allow full use
rotating the frequency selector knobs either clockwise or
of these channels without the system reverting to ILS
counterclockwise, the desired operating frequency is
mode.
programmed into the standby (STBY) display window. A
c. Operating Procedures.
clockwise rotation will increase the displayed frequency
number, while a counterclockwise rotation will decrease it.
1. AVIONICS MASTER switch - ON.
2. OFF PULL IDENT switch - Turn
(4) OFF PULL ID knob. Rotating the OFF
clockwise out of detent.
Adjust
PULL ID knob clockwise from the detented off position
volume as required.
applies power to the unit. No warm up time is required.
3. Mode of operation - Select as
Further rotation of the knob increases NAV signal
required.
volume. NAV voice is heard when the knob is pushed
4. Waypoint -Select as required.
in. When the knob is pulled out, the identification (ID)
5. Tacan channel -Verify, if in a TAC
signal, and voice may be heard.
mode.
6. Frequency - Verify, if in a VOR,
(5) Frequency transfer button.
When
VORTAC, or ILS mode.
pressed, the frequency transfer button will transfer the
7. Station ident -Check as follows:
displayed standby frequency into the USE position and
a. TACAN - Select DME audio.
moves the displayed USE frequency to the STBY
b. VOR - Pull out OFF PULL
(standby) position.
IDENT switch. Push in after
c. Operating Procedure.
identification has been made.
1. AVIONICS MASTER switch - ON.
d. Shutdown Procedures.
2. OFF PULL ID knob - Turn knob
1. OFF PULL IDENT switch - Turn
clockwise out of off (detent).
counterclockwise into the off
Increase volume by further rotation
position.
of knob.
2. AVIONICS MASTER switch - OFF.
3. Frequencies - Select.
Insure
desired active frequency is in USE
3-25. NAV 2 Receiver (KN 53).
display.
a. Description.
The KN 53 NAV 2 receiver
4. Identify station - As required.
d. Shutdown Procedure.
LOC frequencies from 108.00 to 117.95 MHz, and
receive all 40 glideslope channels.
Navigation
1. OFF PULL ID knob - Turn
information is displayed on the copilot's HSI. The
counterclockwise to off (detent).
receiver allows for selecting and storing two frequencies,
2. AVIONICS MASTER switch - OFF.
USE and STBY. These frequencies are displayed at all
times. Both frequencies are provided with storage,
3-26. ADF Radio (KR 87).
which protects them from loss during power
a. Description. The KR 87 automatic directional
interruptions. Power for the receiver is routed through a
finder is a digitally tuned solid state receiver which
2-ampere circuit breaker placarded NAV 2. located on
provides bearing information to stations in the 200 kHz
the copilot's subpanel.
to 1799 kHz frequency band, along with audio reception
b. Controls and Functions.
left display window. The right window will display either
(1) USE display. The active frequency tuned
the stand-by frequency (which can be transferred to the
to. This frequency is first tuned into the STBY position,
active window), or a flight timer, or programmable
then transferred to the USE position by pressing the
elapsed timer. The flight timer will keep track of
frequency transfer button.
3-24 Change 5
