TM 1-1500-204-23-1 NOTE The    water    temperature    should    not exceed 100°F (37°C). (d) Immerse  one  cover  at  a  time  in  the soap solution, let stand for 20-25 minutes, and hand wash for 5 minutes. (e) Rinse  cover  In  clean  water  until  all soap is removed NOTE If    machine    washed,    use    complete wash and rinse cycles. (f) Spread covers on a clean surface out of direct sunlight to dry. (2) Repair.        Repair    polyester    fabric    covers using the following procedures. (a) Inspect    for    cuts,    tears,    punctures, bums  and  broken  stitches.    Any  damage  less  than  2-1/2 inches  long  x  1  inch  wide  in  the  seat  bottom  may  be repaired.  Replace seat bottoms with damage greater than 2-1/2  inches long x 1 inch wide. NOTE Seat backs do not have a damage size limit for repair (b) All     seats     will     be     repaired     using polyester   thread,   Specification   Federal   V.T.      285   and cloth polyester (P/N SS9512) as required. (c) Repairs   will   be   accomplished   using the details in figure 9-37. (d) Damage  that  Is  close  to  the  edge  of the  seat  cover  which  has  insufficient  space  to  allow  a complete patch pattern will not be repaired. (3) Installation  and  removal.    For  instructions on    installation    and    removal,    refer    to    the    applicable maintenance manual for the particular aircraft. 9-21.    Aircraft  Litters.    Litters  installed  in  Army  aircraft shall   be   installed   and   removed   as   described   in   the following paragraphs. a. Installation.  Install Litters using litter kits provided with    each    aircraft.        Refer    to    the    applicable    aircraft maintenance manual for specific installation procedure. b. Removal.    Upon  completion  of  mission  involving litters,   remove   from   aircraft   and   return   to   supplying agency.      Stow   litter   kit   in   original   container   in   aircraft when applicable. 9-22.    Protective  Covers.      The   instructions   contained below   are   applicable   to   all   types   of   aircraft   protective covers and shields used by the Army. a. Installation and Removal Precautions. Installation   and   removal   precautions   for   the   protective covers are as follows. • Protective  covers  shall  be  Installed  to  protect airframe   ccmponents   which   are   affected   by extreme weather conditions. • Covers   shall   be   Installed   when   aircraft   is   to remain  in  an  exposed  area  for  any  extended length    of    time,    or    when    snow    or    ice    is anticipated. • To   keep   out   dust,   rain,   and   foreign   matter, protective   shields,   such   as   intake   duct   and exhaust   covers,   shall   be   Installed   to   cover openings and passages in the aircraft structure and   engine   nacelle   which   leads   to   internal components of aircraft. • Do  not drag covers over sharp objects; prevent contact with ground when Installing and removing. • Spread wet covers out to dry before folding and storing. • When  installing  and  removing  covers,  do  not allow    attaching    buckles    to    scratch    or    mar plexiglass sections of aircraft. 9-45