CE
SSNA 400 MARKER BEACON PILOT'S OPERATING HANDBOOK
(T
YPE R-402A)
SUPPLEMENT
p
rovides the pilot with HI-LO sensitivity selection and a TEST position to
ve
rify operation of all annunciator lights. The small, inner control knob
labeled OFF/VOL, turns the set on or off and adjusts the audio listening
level. The large, outer control knob labeled
BRT,
provides light dimming
for the marker beacon lights.
When the Cessna 400 Marker Beacon controls are incorporated in an
audio control panel incorporated with two or less transmitters a marker
B B
eacon audio level adjustment potentiometer and an annunciator lights
minimum dimming potentiometer are mounted on the audio control panel
cir
cuit
board. Potentiometer adjustments cannot be accomplished exter-
na
lly
.
However, if readjustments are desired, adjustments can be made in
accordance with instructions found in the Avionics Installations Ser-
vice/Parts Manual for this aircraft.
MARKER FACILITIES
MARKER
IDENTIFYING TONE
LIGHT*
inner & Fan
Continuous 6 dots/sec (300 Hz)
White
Middle
Alternate dots and dashes (1300 Hz)
Amber
Outer
2 dashes/sec (400 Hz)
Blue
* When the identifying tone is keyed, the respective indicating
light will blink accordingly.
2
1 July 1979
18
PILOT'S OPERATING HANDBOOK CESSNA 400 MARKER
BEACO
N
SUPPLEMENT
(TYPE R-402A)
AUDIO CONTROL PANEL FOR USE WITH ONE OR TWO TRANSMITTERS
1.
MARKER BEACON ANNUNCIATOR LIGHTS:
OUTER - Light illuminates blue to indicate passage of outer marker beacon.
MIDDLE - Light illuminates amber to indicate passage of middle marker beacon.
I NNER and FAN - Light illuminates white to indicate passage of inner and fan
marker beacon.
2.
SPEAKER/OFF/PHONE SELECTOR SWITCH:
SPEAKER POSITION - Turns set on and selects speaker for aural reception.
OFF POSITION - Turns set off.
PHONE POSITION - Turns set on and selects phone for aural reception.
3.
ANNUNCIATOR LIGHTS SWITCH:
NITE POSITION - Places the annunciator lights in a dim lighting mode for night
flying operations. Light intensity of the NITE position is controlled by the
RADIO LT dimming rheostat.
DAY POSITION - Places the annunciator lights in the full bright position for
daylight flying operations.
TEST POSITION - Illuminates all marker beacon annunciator lights (and other
annunciators) in the full bright position to verify operation of annuncia-
tor lights.
4.
HIGH/LO/MUTE SELECTOR SWITCH:
HIGH POSITION - Receiver sensitivity is positioned for airway flying.
LO POSITION - Receiver sensitivity is positioned for
ILS
approaches.
MUTE POSITION - The marker beacon audio signals are temporarily blanked out
(for approximately 30 seconds) and then automatically restored, over the
speaker or headset in order to provide voice communications without
interference of marker beacon signals.
Figure 1. Cessna 400 Marker Beacon Operating Controls and
Indicator Lights Supplied with Two or Less Transmitters
1 July 1979
3
