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Page Title: Excessive Pressures
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Aviation Boatswains Mate E - Aviation theories and other practices
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REVIEW QUESTIONS

and should be checked against failure. Failure of the drive  system  could  cause  serious  injury  to  operating and aircraft personnel. Excessive Pressures The  accumulator  is  built  to  take  a  400-psi  initial charge  and  such  additional  pressure  as  is  developed during   arrestment.   This   capacity   provides   for   an overloading  factor.  However,  it  is  most  important  that the   accumulator   blow-down   valve   on   the   charging panel   be   kept   open.   Should   leakage   occur   from high-pressure    piping    as    the    result    of    inadequate valving, this, with the additional compression loading during arrestment, could cause an extremely dangerous accumulator   pressure.   One   operating   indication   of excessive    accumulator    pressure    is    retraction    that exceeds   normal   speed.   Initial   accumulator   pressure must be held at 400 psi. A safety diaphragm is installed on  the  air  side  of  the  accumulator  to  eliminate  the possibility of an accumulator explosion. Fluid Level Indicator Safety When the engine is in BATTERY position, the fluid level indicator must read BATTERY. Should any other reading be indicated, the engine must not be operated until a battery indication is effected. Malfunctions and Safety Personnel must always be certain that their method of   operation   is   not   responsible   for   a   malfunction. Possible  malfunctions,  causes,  effects,  and  remedial action are listed in Operational and Organizational/Intermediate     Maintenance     Manual with  Illustrated  Parts  Breakdown,  for  all  Shipboard Aircraft  Recovery  Equipment,  NAVAIR  51-5BBA-2.1 and 2.2. SAFETY IN MAINTENANCE Any  engine  not  operable  or  shutdown  because  of malfunctions, breakdown, needed adjustment, or repair should    have    the    deck    pendant    removed    and    all operating   pressures   relieved.   Leaks   indicate   poor fittings or bad packing and result in pressure losses and probable malfunction. Every leak must be immediately investigated  to  determine  the  cause  and  the  corrective action to be taken. Cleanliness concerning debris, waste wiping   materials,   and   tools   must   be   very   strictly adhered    to,    particularly    where    involvement    with operable  parts  may  occur.  A  jammed  up  engine  as  a result of carelessness with work materials could result in  injury  and/or  loss  of  life.  Lubrication  tables  for  all equipment  must  be  strictly  adhered  to.  Venting  the various  lines  to  remove  entrapped  air,  foam,  or  waste fluids is a preoperational and operational requirement. Safe operations depend upon strict adherence to these and all other pertinent safety instructions. Molten Metal and Heating Methods A detailed description of heating and using molten metal  for  pouring  sockets  is  contained  earlier  in  this chapter.  Particular  attention  should  be  given  to  the warning   notes   and   instructions   regarding   personnel safety.   All   personnel   involved   in   terminal   pouring operations  or  in  any  operations  where  molten  metals are involved should wear goggles, gloves, aprons, and such  other  protective  clothing  as  is  necessary.  Ample ventilation must be provided against fumes given off by molten metals. Cables, Pendants, and Taut Lines In running pendants, cables, or taut lines, personnel should be familiar with procedures so that equipment is placed without kinking, twisting, or unnatural positioning.  Improper  handling  of  cables  will  cause strand breakage and subsequent weakening and failure. Whenever   deck   tractors   are   used   for   pulling   out pendants, all personnel must be on guard for cable lash. Improper Landings Personnel  at  deckedge  stations  or  on  deck  duty must be alert during landing operations to stay clear of any aircraft and particularly those making offcenter or excessive-speed   landings.   Either   type   can   lead   to pendant failures, unequal stanchion loading in the event of  barricade  landings,  and  the  possibility  that  such aircraft will go over the deck edge. Safety Checklist The following safety checklist should be posted at applicable locations: ·  Replace broken, worn, or kinked deck pendants and barricade deck cables as soon as operations permit. ·  Inspect   deck   pendants   after   each   group   of landings and after each excessive-load landing, such  as  extreme  offcenter  landings  or  extreme runout to two-blocking. 3-62

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