9. Disassemble the trunnion bearing. Examine the bearing set for wear, and replace it if necessary. Reassemble the linkage as follows: 1. Connect the clevis and crank assembly. 2. Connect the link to the panel. 3. Connect the link to the arm assembly. Check over-center locking as follows: 1. Move the linkage over-center until the arm assembly and the link are locked in over-center position. 2. The piston of the hydraulic cylinder should be within 1/2 inch of the bottom. If it is not, turn the clevis on the threaded piston rod to obtain the required measurement. 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 malfunctions. 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 blast deflector. 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. LAUNCHING ACCESSORIES Each type or series of aircraft requires a specific hookup configuration. It is essential that the right hookup procedures and equipment are used for each aircraft. The following list contains some of the most important bulletins available that list the requirements for proper hookup procedures and usage of various accessories: 1. Catapult Deck Gear Accessories Service Bulletin 226. This bulletin serves as a guide for the proper hookup procedures for all carrier-based aircraft. Included are photographs, supplemented by pertinent hookup instructions, and hookup discrepancies to be avoided. 2. Catapult Deck Gear Accessories Service Bulletin 235. This bulletin contains information concerning proper lanyard configurations and attachment instructions for all bridle/pendants used with the Mk 2 and Mk 4 bridle arresters. 3. Aircraft Launching Bulletin 0-12. This bulletin contains information concerning the various accessories used in launching aircraft. It consists of usage requirements and limitations on all launching accessories. It is imperative that the correct deck gear be used to ensure safe launching operations. In addition, certain inspections must be performed to ensure that the equipment meets the inspection criteria established by the applicable MRCs. 5-11