TM 1-1510-218-10 8A-18 1.   Cabin  pressurization  –  Set.    Adjust  cabin controller dial as required. 2.   CABIN SIGNS switch – As required. 3.   ICE & RAIN switches – As required. NOTE Set windshield heat to NORMAL or HIGH as required   well   before   descent   into   icing conditions or into warm moist air to aid in defogging.  Turn off windshield heat when descent   is   completed   to   lower   altitudes and  when  heating  is  no  longer  required. This    will    preclude    possible    windshield distortions. 4.   WSHLD ANTI-ICE – As required. 5.   RECOG lights – ON. 6.   Radar atimeter – As required. 7.   Altimeters – Set to current setting. 8.   TCAS – Set as required. H 9.   Arrival briefing – Complete. 8A-38.  DESCENT. Descent  from cruise  altitude  should  normally  be made by letting down at cruise airspeed with reduced power.    Refer  to  Chapter  7  for  power  settings  and rates of descent. NOTE Cabin pressure controller should be adjusted prior to starting descent. a.    Descent   –   Maximum   Rate   (Clean).      To obtain    the    maximum    rate    of    descent    in    clean configuration, perform the following: 1.   Cabin  pressurization  –  Set.    Adjust  cabin controller dial as required. While descending, adjust rate control knob so that cabin    rate    of    descent    equals    one-third aircraft rate of descent. 2.   CABIN SIGNS switch – As required. 3.   POWER levers – IDLE. 4.   PROP levers – HIGH RPM. 5.   GEAR – UP. 6.   FLAPS – UP. 7.   Airspeed – V_mo maximum. 8.   ICE & RAIN switches – As required. 9.   RECOG lights – As required. b.    Descent     –     Maximum     Rate     (Landing Configuration).      If   required   to   descend   at   a   low airspeed (e.g., to conserve airspace or in turbulence), approach  flaps  and  landing  gear  may  be  extended  to increase    the    rate    and    angle     of    descent     while maintaining  a  slower  airspeed.    To  perform,  use  the following procedure: 1.   Cabin  pressurization  –  Set.    Adjust  cabin controller dial as required. While descending, adjust rate control knob so that cabin    rate    of    descent    equals    one-third aircraft rate of descent. 2.   CABIN SIGNS switch – As required. 3.   POWER levers – IDLE. 4.   PROP levers – HIGH RPM. 5.   FLAPS – APPROACH. 6.   GEAR – DN. 7.   Airspeed – 181 KIAS maximum. 8.   ICE & RAIN switches – As required. 9.   RECOG lights – As required. 8A-39.  APPROACH. 1.   EHSI NAV SOURCE – As required. Ensure  the  correct  navigational  source  for the approach has been selected. 2.   TCAS – Set as required. 8A-40.  BEFORE LANDING. 1.   CABIN SIGNS switch – BOTH. 2.   AUTOFEATHER switch – ARM. 3.   BRAKE DEICE switch – As required. 4.   PROP levers – As required. NOTE During approach, propellers  should be set at 1900 RPM to prevent glideslope interference (ILS approach), provide better power    response    during    approach,    and minimize  attitude  change  when  advancing propeller levers for landing. 5.   FLAPS (below 199 KIAS) – APPROACH. 6.   GEAR (below 181 KIAS) – DN, confirm. 7.   LANDING LIGHTS – As required. 8.   CONDITION levers – HIGH IDLE. 9.   TCAS – Set as required.