CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 9-46
Figure 1. Cessna 400 Marker Beacon Operating Controls and Indicator Lights
1. OFF/VOLUME CONTROL – The small, inner control turns the set on or off and adjusts the audio
listening level. Clockwise rotation turns the set on and increases the audio level.
2. DIM/BRT CONTROL – The large, outer control provides light dimming for the marker lights.
Clockwise rotation increases light intensity.
3. TEST SWITCH – (152 Model Series Only) When the press-to-test switch button is depressed, the
marker beacon lights will illuminate, indicating the lights are operational (the test position is a lamp
test function only).
4. LO/HI SWITCH – (152 Model Series Only) In the LO position (Up), receiver sensitivity is positioned for
ILS approaches. In the HI position (Down), receiver sensitivity is positioned for airway flying.
5. SPEAKER/PHONE SWITCH – Selects speaker or phone for aural reception.
6. MARKER BEACON INDICATOR LIGHTS – Indicates passage of outer, middle, and inner marker
beacons. The OUTER light is blue, the MIDDLE light is amber and the INNER light is white.
7. HI/LO/TEST SWITCH – (All Models Except 152 Model Series) In the HI position (Up), receiver
sensitivity is positioned for airway flying. In the LO position (Center), receiver sensitivity is
positioned for ILS approaches. In the TEST position (Down), the marker lights will illuminate,
indicating the lights are operational (the test position is a lamp test function only).
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