Beechcraft C-12C Operator And Technical Reference Manual page 274

TM 1-1510-218-10
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
(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.
selector indicator circuits when pressed.
(9) TRIM DN Indicator.
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.
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.
illuminates engaged indicator.
(b) DIS.
illuminates disengaged indicator.
3A-32
Figure 3A-19. Autopilot Mode Selector Panel
Tests display and
Illuminates when
Illuminates when
Engages autopilot
Disengages autopilot and
7. IAS Switch / Indicator
8. Self-Test Switch
9. TRIM DN Indicator
10. TRIM UP Indicator
11. ENG / DIS Switch
12. ALT Switch / 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
and
Figure 3A-20. Autopilot Pitch-Turn Panel
(1) Turn Control Knob.
commands to autopilot.
detent.
Supplies roll rate
Spring loaded to center