TM 1-1500-204-23-1 CHAPTER 3 FLIGHTLINE OPERATIONS 3-1. General.  General flightline operations used on all aircraft are described in the following paragraphs. 3-2. Flightline Safety.  To avoid injury to personnel or damage  to  aircraft,  the  procedures  and  general  safety rules     will     be     followed     when     servicing,     operating, mooring, maintaining, or moving aircraft on the ground. a. Hearing    Protection.      Noise      levels      reached during ground runup of Army aircraft are of a level that may    cause    permanent    hearing    loss.        Maintenance personnel shall wear adequate hearing protection when working on aircraft with engines in operation. b. Foreign  Object  Damage.    To  prevent  Foreign Object  Damage  (FOD),  the  following  precautions  shall be observed during maintenance of turbine engines. Regularly     police     parking     areas,     runways, taxiways,   and   runup   and   exhaust   areas   to ensure against the presence of foreign objects which    could    enter    the    engine.        Special attention  shall  be  given  to  cleaning  of  cracks and  expansion  seams  in  hard  surfaced  areas where  engines  will  be  operated.    Tests  have indicated  that  these  are  the  main  source  of foreign objects which are ingested. Periodically instruct personnel concerned with aircraft maintenance of foreign object hazards to ensure that maximum preventive measures are taken. Ensure     that     air     inlet     and     tailpipe     dust excluders    are    installed    at    all    times    when engines are not being operated, except when it  is  known  the  engine  will  again  be  operated immediately following shutdown. Prior  to  each  engine  start,  thoroughly  inspect and   clean   inlet   ducting.      Remove   all   loose nuts, bolts, tools, or other objects which would cause engine damage and possible subsequent failure. After work has been accomplished, inspect to ensure that all accessories and attaching parts are secure and that work areas are cleared of foreign objects prior to engine operation. Provide   properly   marked   receptacles   in   all work    areas    into    which    trash,    ferrous    and nonferrous   scrap,   safety   wire,   etc,   may   be placed. Adhere    to    applicable    gas    turbine-powered aircraft   taxiing   and   parking   procedures   as outlined in applicable technical bulletins.  This minimizes    damage    due    to    material    being thrown by the exhaust blast into the intake of other aircraft. Ensure    that    gas        turbine-powered    aircraft takeoff and landing procedures are such as to avoid   the   intake   of   foreign   objects   blasted from     runways     and     runway     shoulders     by preceding aircraft. Use inlet duct runup screens during all ground operations,    including    taxiing    to    and    from takeoff position. Inlet  duct  runup  screens  are  not  required  on aircraft using centrifugal flow engines. When  necessary  to  properly  evaluate  engine performance  or  when  icing  conditions  exist, inlet  duct  runup  screens  should  be  removed. Runup with screens removed shall be made in a designated, thoroughly cleaned area. CAUTION Inlet duct runup screens shall not be installed  and  removed  with  engines operating   above   idle   rpm.      Loose items  of  clothing  shall  not  be  worn. Objects  which  might  be  drawn  into the  intake  ducts  shall  not  be  carried when installing or removing screens. Damage to equipment may otherwise result. 3-1