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MAINTENANCE - 14310_215
MK 2 NOSE-GEAR-LAUNCH (NGL) SYSTEM

Aviation Boatswains Mate E - Aviation theories and other practices
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cylinder bracket assemblies so that all lube fittings can be reached from the deck. PROTECTING OPEN EQUIPMENT.—When removing a component from the hydraulic system, cap or plug all openings to prevent entry of foreign matter. Use tape to protect pipe threads. CLEANING.—Hydraulic system components must be disassembled, cleaned, repaired, and reassembled as specified in the operation, maintenance, and overhaul instructions manual for the specific type of JBD installation on your ship. WARNING Before repairing or removing any components  connected  to  hydraulic  or  water lines,  make  sure  the  lines  are  depressurized. Also,  before  repairing  or  removing  any  elec- trical   component,   de-energize   the   electrical circuit and attach an out-of-service tag. HOSES, SEALS, AND O-RINGS.—Hoses, seals,  and  O-rings  are  selected  on  the  basis  of  their compatibility   with   the   hydraulic   fluid.   Therefore, replacement  parts  should  be  of  the  same  material  as original  parts.  O-rings  must  be  removed  and  replaced with  care  to  avoid  damage  to  the  O-ring  and  O-ring sealing  surfaces  of  the  various  parts.  O-rings  must  be free  of  cuts  and  not  deformed.  New  O-rings  must  be installed  at  every  reassembly  of  components.  Before assembly,  all  O-rings  must  be  lightly  lubricated  with the  system  hydraulic  fluid.  Hoses  are  subject  to  wear and   require   periodic   replacement.   When   installing hoses,   take   care   to   avoid   unnecessary   bends   and overstressing. To  restore  the  JBD  system  to  operating  condition after   a   down   period   that   required   draining   fluid, perform preoperational inspection procedures given in the applicable MRC. For  most  repairs  to  the  hydraulic  system,  only portions of the system need be drained. Isolation valves in  each  of  the  hydraulic  cylinder  lines  and  a  shutoff valve between the stack valve and the catapult pumps permit   isolation   of   portions   of   the   JBD   hydraulic system. Troubleshooting Most    problems    that    occur    on    JBDs    can    be recognized as a failure of one of three systems—namely, hydraulic, electrical, or water. Information that allows operating and maintenance personnel    to    locate    the    source    of    problems    or equipment failure is found in the JBD technical manual, in the section covering trouble shooting. SAFETY PRECAUTIONS The energy required to operate the JBD is supplied by fluid under pressure; therefore, when operating with fluid under pressure, observe standard safety precautions that apply. All moving parts and equipment should be checked for   rags,   tools,   or   other   foreign   material   before operating    any    of    the    machinery.    Only    qualified operators shall be allowed to operate the JBDs. The   parking   of   aircraft   on   the   deflector   panel should    be    avoided.    The    panels    are    designed    to withstand  only  the  temporary  weight  of  the  aircraft taxiing over them. When   you   perform   maintenance   on   the   JBD, comply with the safety precautions listed on the MRC. Personnel and equipment shall be clear of the JBD machinery  enclosure  and  depressed  deck  when  the panels  are  being  raised  or  lowered.  This  includes  the times   when   the   panels   are   being   operated   during preoperational inspections and maintenance or overhaul tests and inspections. REVIEW QUESTIONS Q1. What provides the means of physically raising and lowering the JBD panels? Q2. Each   Mk   7   Mod   0   JBD   panel   assembly consists of how many tube assemblies? Q3. What   permits   rotational   movement   of   the piping as the JBD is raised and lowered? Q4. What   is   the   maximum   temperature   of   the cooling water? Q5. What controls the hydraulic fluid to and from the hydraulic cylinders? Q6. What type of valve is the stack valve? Q7. What is the differences between the deckedge and the auxiliary control panel? Q8. The double indicator light will provide what indication? Q9. What is the function of the “all” raise switch on the chestpack portable control? 5-14







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