TM 1-1510-218-10
3A-32
1. HDG Switch / Indicator
2. NAV Switch / Indicator
3. APPR Switch / Indicator
4. B / C Switch / Indicator
5. AUTO PILOT TRIM TEST Indicator
6. AUTO PILOT TRIM TEST Switch
7. IAS Switch / Indicator
8. Self-Test Switch
9. TRIM DN Indicator
10. TRIM UP Indicator
11. ENG / DIS Switch
12. ALT Switch / Indicator
Figure 3A-19. Autopilot Mode Selector Panel
(6) AUTO PILOT TRIM TEST Switch. Used
to simulate a no-trim condition to test trim monitor
system.
(7) IAS Switch/Indicator. Engages airspeed
hold mode. Commands aircraft to maintain airspeed.
(8) Self-Test Switch. Tests display and
selector indicator circuits when pressed.
(9) TRIM DN Indicator. Illuminates when
autopilot is driving trim servo in down direction or, (on
some aircraft) if autopilot is disengaged, when manual
down trim is required.
(10) TRIM UP Indicator. Illuminates when
autopilot is driving trim servo in up direction or, (on
some aircraft) if autopilot is disengaged, when manual
up trim is required.
(11) ENG / DIS Switch. Controls coupling of
the automatic pilot.
(a) ENG.
Engages
autopilot
and
illuminates engaged indicator.
(b) DIS. Disengages autopilot and
illuminates disengaged indicator.
(12) ALT Switch / Indicator. Engages altitude
hold mode. Commands aircraft to maintain pressure
altitude.
d. Controls and Functions, Autopilot Pitch
Turn Panel. Refer to Figure 3A-20.
1. Turn Control Knob
2. Pitch Control Thumbwheel
Figure 3A-20. Autopilot Pitch-Turn Panel
(1) Turn Control Knob. Supplies roll rate
commands to autopilot. Spring loaded to center
detent.
