TM 1-1510-218-10
3C-17
1. EHSI Brightness Control
10. CRS 1/2 Button
2. EADI Brightness Control
11. ARC Button
3. CURSOR
12. Range Button
4. MFD Test Button
13. Mode Selector
5. DH Setting
14. ADI / PFD Button
6. Radio Altitude Test
15. Bearing Source Selector
7. Course Source Selector
16. HDG Selector
8. Course Selector
17. HDG SYNC Button
9. Course Sync Button
18. Data Selector
19. Cursor Reset
Figure 3C-5. Multi-Functional Display Control Panel
Perform the following procedure to select the
MFD status page.
1. Press the MFD DU TEST button on the
control panel.
2. Press the ARC button on the control panel
to exit diagnostics.
(5) DH Setting. The DH SET knob rotates
and has a center push button. The DH SET knob is
used to set the decision height. Clockwise rotation
increases the decision height. The decision height is
displayed in green following the letters DH in the lower
right corner of the ADI. When the radio altitude is at or
below the DH setting, the yellow letters DH appear in
the right center portion of the ADI or PFD display and
a “Minimum” aural annunciation is sounded. Once the
DH annunciation appears, it is removed from the
display when the radio altitude climbs at least 25 feet
above the decision height. If the radio altimeter
system fails, the decision height annunciator is
removed and the radio altitude flag appears.
(6) Radio Altitude Test. The center push
button on the DH SET knob setting is a radio altitude
test button. Pushing the test button causes the radio
altimeter to go into test. While the radio altimeter is in
test, the digital readout remains displayed, even when
the radio altimeter validity is flagged.
(7) Course Source Selector. The blind
course select knob placarded CRS is a dual concentric
knob with a center push button. The outside knob
selects the active course sources. The selections are
FMS or VOR. The selector switch is a knob that when
rotated, cycles between the sources. Used in
conjunction with the CRS 1/2 button, the Nav sources
are switched between all navigation sources (i.e.,
FMS 1/FMS 2 or VOR/VOR 2).
(8) Course Selector. The inner knob on the
Course Source Control selects the desired course for
the active course source. When the knob is moved
slowly, a single click will result in a 1° course change.
If the knob is rotated quickly, the course setting
changes numerous degrees per click.
