TM 1-1510-225-10 9-6 5.  LANDING/TAXI LIGHTS – OFF. 6.  POWER – As required. 7.  YD– As required. 9-16.  MAXIMUM GLIDE. In the event of failure of both engines, maximum glide   distance   can   be   obtained   by   feathering   both propellers to reduce propeller drag and by maintaining the  appropriate  airspeed  with  the  gear  and  flaps  up. Figure  9-2 gives the approximate  gliding  distances  in relation to altitude. 9-17.  LANDING WITH TWO ENGINES INOPERATIVE. Maintain  best  glide  speed.    Refer  to  Figure  9-2 for   maximum   glide   distances.      If   sufficient   altitude remains   after   reaching   a   suitable   landing   area,   a circular pattern will provide best observation of surface conditions,  wind  velocity,  and  direction.    When  the condition  of  the  terrain  has  been  noted  and  landing area selected, set up a rectangular pattern.  Extending APPROACH   flaps   and   landing   gear   early   in   the pattern  will  give  an  indication  of  glide  performance sooner and will allow more time to make adjustments for the added drag.  Select a landing area of adequate size  to  accommodate  the  aircraft,  preferably  free  of obstacles and smooth.  Fly the base leg as necessary to control the point of touchdown.    Plan  to  overshoot rather than undershoot, then use flaps as necessary to arrive at the selected landing point.  Keep in mind that, with both propellers feathered, the normal tendency is to overshoot due to less drag.  In the event a positive gear-down    indication    cannot    be    determined,    and unless  the  surface  of  the  landing  area  is  hard  and smooth, the landing should be made with the landing gear up.  If landing on rough terrain, land in a tail-low attitude   to   keep   the   nacelles   from   digging   in.      If possible, land with flaps fully extended. 9-18.  LOW OIL PRESSURE. In  the  event  of  a  low  oil  pressure   indication, perform the following procedures as applicable: 1.  R  Torque – 49% maximum.  Oil pressure less  than  100  psi  below  21,000  feet  or less than 85 psi above 21,000 feet. 2.  T3  F3 Torque –  1093 ft-lb maximum.  Oil pressure  less  than  100  psi  below  21,000 feet or less than 85 psi above 21,000 feet. 3.  Oil   Pressure   Below   60   psi   –   Perform engine   shutdown,   or   land   as   soon   as practicable    using    minimum    power    to ensure safe arrival. 9-19.  CHIP DETECT CAUTION LIGHT ILLUMINATED. If  the  L  CHIP  DETECT  or  R  CHIP  DETECT caution    annunciator    illuminates,    and    safe    single- engine   flight   can   be   maintained,   perform   engine shutdown. 9-20.  DUCT OVERTEMP CAUTION LIGHT ILLUMINATED. Ensure   the   cabin   floor   outlets   are   open   and unobstructed,   then   perform   the   following   steps   in sequence until the annunciator is extinguished.  Allow approximately  30  seconds  after  each  adjustment  for the system temperature to stabilize. The overtemperature     condition     is     considered     to     be corrected  at  any  point  during  the  procedure  that  the light goes out. 1.  CABIN/COCKPIT AIR control – In. 2.  CABIN TEMP MODE switch – AUTO. 3.  CABIN TEMP switch – Decrease. 4.  VENT BLOWER switch – HIGH. 5.  CABIN   TEMP   MODE    switch    –    MAN COOL. 6.  CABIN TEMP switch – Decrease (hold).