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Controls

Controls for the autopilot appear in three places in the cockpit:

• On the 

front of the autopilot

 bezel itself is a L/R TURN knob used to manually  

command turns while the autopilot is in stabilization mode. Pressing on this 
knob also cycles the autopilot through its four modes of operation, discussed 
below.

• The 

left seat control yoke

 has been modified to include an AP MODE SEL 

switch, which performs the exact same function as the mode select button on 
the autopilot bezel, and a red AP DISC switch which will immediately 
disconnect the autopilot. The push-to-talk switch for the radios has been moved 
to the left side of the yoke.

• On the 

instrument panel where the old autopilot was located

 (beneath the 

oil pressure and temperature gauges) are two switches. AP MASTER is the 
power switch for the autopilot. Next to it is an AP NAV SELECT switch which 
controls which navigation radio is to be used for the course tracking modes. 
This functions similarly to the DME SELECT switch on the panel, indicating 
whether the top (NAV 1) or bottom (NAV 2) radios and CDIs are to be used.

Pilots should remember to turn the AP MASTER switch ON as a part of 
normal engine start when the autopilot is to be used, and also to turn it OFF 
before shutting down the engine. Pilots should add this step to the shutdown 
checklist immediately before turning the avionics master switch off.

Engaging the Autopilot

After power-on via the AP MASTER switch (and executing the power-up tests as 
recommended), the green RDY light should be illuminated. To engage the autopilot in any of 
its flight modes, press either the AP MODE SEL switch on the yoke, or the L/R TURN knob 
(also labeled PUSH MODE) on the autopilot bezel. Pressing AP MODE SEL sequences the 
autopilot through its four operational modes.

If use of the autopilot during a flight is not anticipated, it is recommended that the autopilot 
remain powered off (AP MASTER switch left in the OFF position).

Modes of Operation

The S-TEC System Twenty autopilot has four modes of operation. The active mode is 
displayed on the face of the autopilot by a yellow lamp. When the autopilot is disengaged 
(not in control of the roll axis), all these lamps will be off, and only the green RDY lamp will 
remain lit.

N6004H S-TEC Autopilot Reference

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cvk

 1/29/13

Summary of Contents for Archer N6004H

Page 1: ...p along with the battery master as usual The autopilot component is powered separately and has its own power switch so both the battery master and the AP MASTER switch need to be on for the autopilot to power up It takes many seconds for the autopilot to become ready after power on because it has to wait for the TC to become stable and align its own platform in addition to performing its own compu...

Page 2: ...om NAV 2 radios and CDIs are to be used Pilots should remember to turn the AP MASTER switch ON as a part of normal engine start when the autopilot is to be used and also to turn it OFF before shutting down the engine Pilots should add this step to the shutdown checklist immediately before turning the avionics master switch off Engaging the Autopilot After power on via the AP MASTER switch and exec...

Page 3: ...acking since the autopilot will track all needle excursions and may behave badly during VOR station passage Maneuver the aircraft to a heading within 10º of the selected course with the CDI no more than one dot deflected from center before engaging the autopilot in this mode Disengaging the Autopilot The autopilot can be disengaged normally by any of the following three actions Pressing the red AP...

Page 4: ...thin three minutes RDY light alone will illuminate indicating autopilot readiness Move yoke left and right to sense normal freedom of movement Set L R TURN knob to neutral position Press AP MODE SEL once to engage stabilization wing leveler mode ST lamp alone illuminates indicating stabilization wing leveler mode active Move yoke left and right to sense servo and verify manual override Yoke should...

Page 5: ...urse track mode active Turn NAV1 OBS until CDI needle is deflected 2 dots right of center Yoke should turn to the right under servo control Turn NAV1 OBS until CDI needle is deflected 2 dots left of center Yoke should turn to the left under servo control Turn NAV1 OBS until CDI needle is centered Yoke movement should stop Disconnect autopilot using one of the following means Press red AP DISC butt...

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