Century 2000 - PREFLIGHT TEST SEQUENCE

PREFLIGHT TEST SEQUENCE
CENTURY 2000 PREFLIGHT PROCEDURES
FOR NO MOD. CENTURY 2000
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 TST switch. All annunciators shall
illuminate.
*10. After “GS” and “ALT” annunciators extinguish release TST SWITCH;
only “HDG”, “ATT”, and “TST” remain illuminated.
*11. Press DN switch, HDG, and ATT annunciators remain illuminated, TST
may momentarily flicker and then remains illuminated.
*12. Press UP switch, HDG, and ATT annunciators remain illuminated, TST
may momentarily flicker and then remains illuminated.
*13. Momentarily press TST switch. HDG and ATT annunciators remain
illuminated, TST annunciator flashes.
*14. Press and hold DN switch. TST annunciator extinguishes
*15. Press and hold the UP switch. TST annunciator extinguishes.
*16. Momentarily press and release TST switch. HDG and ATT
annunciators remain illuminated, TST annunciator extinguishes.
*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.
This completes the test sequences.
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.
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