Century 4000 Pilots Operating Manual page 7

NOTE
During system functional check the system must be provided adequate D.C. voltage (12.0 VDC or 24
VDC min.) and instrument air (4.2 in. Hg. Min.). It is recommended that the engine be operated to
provide the necessary power and that the aircraft be positioned in a level attitude, during the functional
check. Due to the weight of the elevator in certain models of aircraft, steps 4 and 5 may not move the
control wheel. To verify correct direction of commands, support elevators to remove weight and continue
steps.
AUTOPILOT/AUTOTRIM - To be performed before the first flight of each day.
1. Trim Master Switch - ON.
2. Engage Autopilot.
3. Move the heading bug left and right of the lubber line. Observe that the control wheel moves in the
direction of the heading bug displacement.
4. Press the DN Switch - verify that the control wheel moves in the down direction. Verify that after
approximately a 3 second delay, the trim moves in the down direction.
5. Press the UP Switch - verify that the control wheel moves in the up direction. Verify that after
approximately a 3 second delay, the trim moves in the up direction.
6. Grasp control wheel and override roll and pitch servo actuators to assure override capability.
7. Hold control yoke and disengage autopilot by activating the AP OFF Switch on the control wheel or
by the programmer off switch.
8. Check controls through full travel in roll and pitch to assure complete autopilot disengagement.
9. With autopilot OFF, press and hold TST switch. All available mode annunciators shall illuminate for 3
sec. then extinguish and the AP shall flash as long as the TST switch is held.
10. Release the TST switch. Only HDG, ATT and TST shall be illuminated.
11. Press and hold the DN switch. The TST annunciator may momentarily flicker but should remain
illuminated. HDG and ATT shall remain on. Release the DN switch.
12. Press and hold the UP switch. The TST annunciator may momentarily flicker but should remain
illuminated. HDG and ATT shall remain on. Release the UP switch.
13. Momentarily press and hold the TST switch. The AP and TST annunciators shall flash and the HDG
and ATT shall stay illuminated. Release the TST switch. The HDG and ATT shall remain on the TST
annunciator shall remain flashing.
14. Press and hold the DN switch. The TST annunciator shall extinguish. HDG and ATT shall remain
on. Release the DN switch.
15. Momentarily press and hold the TST switch. The AP and TST annunciators shall flash and the HDG
and ATT shall remain on the TST annunciator shall remain flashing.
16. Press and hold the DN switch. The TST annunciator shall extinguish. HDG and ATT shall remain
on. Release the DN switch.
*COMMAND TRIM SYSTEM - To be performed before the first flight of each day.
1. Using the control wheel trim switch, verify normal trim up and down operation.
2. Move red portion of trim switch forward and aft. Observe that the trim system does not operate.
3. Release the red bar on the control wheel trim switch. Move the black portion fore and aft. Observe
that the trim system does not operate.
CAUTION
Any failure of the above procedures indicates that a failure exists in the system and the system shall not
be operated until the failure has been located and corrected.
CAUTION
Check the elevator trim setting before takeoff.
PREFLIGHT TEST SEQUENCE
CENTURY 4000 PREFLIGHT PROCEDURES
CENTURY 4000 AUTOTRIM
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