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      FDC help: Symmetrical autopilot modes
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    <h2>
      Autopilot model, subsystem <i>Symmetrical autopilot modes</i>
    </h2>
    <p>The subsystem <i>Asymmetrical autopilot modes</i>, which is part of the
    systems <i><a href="apilot.htm#APILOT1">APILOT1</a></i>, <i><a href=
    "apilot.htm#APILOT2">APILOT2</a></i>, and <i><a href=
    "apilot.htm#APILOT3">APILOT3</a></i> contains the following control modes
    of the &#39;Beaver&#39; autopilot: </p>
    <ul>
      <li>
        Pitch Attitude Hold (PAH), including turn compensation
      </li>
      <li>
        Altitude Hold (ALH), including turn compensation
      </li>
      <li>
        Altitude Select (ALS)
      </li>
      <li>
        symmetrical approach mode: Glideslope (GS)
      </li>
    </ul>
    <p>The PAH mode is also used as inner-loop for ALH, ALS, and GS.</p>
     <p>In Glideslope mode, a switch criterion is used to switch from the
    Glideslope-Armed phase, in which the aircraft is usually flying under ALH
    control, to Glideslope-Coupled. Note: for reasons of computing speed, GS
    has not been included in the system <i>APILOT1</i>.</p>
     <p>The block <i>Select symm. mode-controller signals</i> separates the
    mode-switch settings from the inputvector <i>ymode</i> and reference
    signals from the inputvector <i>yref</i> for the symmetrical autopilot
    modes from the asymmetrical mode-switch settings and reference signals. </p>
    <h3>
      More information
    </h3>
    See the explanation of the subsystems <i><a href="modectrl.htm">Mode
    Controller</a></i> and <i><a href="refsgnls.htm">Reference Signals</a></i>
    for more information about the inputvectors <i>ymode</i> and <i>yref</i>.
    See also the <a href="colors.htm">color definition table</a> for the FDC
    toolbox and the subsystem <i><a href="ap_asymm.htm">Asymmetrical autopilot
    modes</a></i>. 
    <h3>
      <a name="References">References</a>
    </h3>
    <p>For a detailed description of the &#39;Beaver&#39; autopilot, refer to the FDC user-manual. More information can be found in the following
    references:</p> 
    <ol>
      <li>
        M.O. Rauw: <i>A Simulink environment for Flight Dynamics and Control
        analysis - Application to the DHC-2 &#39;Beaver&#39;</i> (PART II).
        MSc-thesis, Delft University of Technology, Faculty of Aerospace
        Engineering, Delft, The Netherlands, 1993.
      </li>
      <li>
        P.N.H. Wever: <i>Ontwerp en implementatie van de regelwetten van de De
        Havilland DHC-2 &#39;Beaver&#39;</i> (in Dutch). MSc-thesis, Delft
        University of Technology, Faculty of Aerospace Engineering, Delft, The
        Netherlands, 1993.
      </li>
    </ol>
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