4-54. 4-55. 4-56. 4-57. 4-58. 4-59. To prevent an airframe jack from being lowered too rapidly, what component is installed as a safeguard? 1. A safety locknut 2. A hydraulic hand pump 3. A safety bypass valve 4. A hydraulic ram safety valve When jacking aircraft aboard ship, you must have what minimum number of tie-down chains per jack? 1. Six 2. Two 3. Three 4. Seven During jacking operations, the tie- down chain preload is too high when which of the following conditions exists? 1. The jack safety valve bypasses fluid 2. The first stage locknut does not turn 3. The tensioning grip cannot be rotated by hand 4. The jack baseplate is seated flush with the deck As a bullet passes through the cell wall of a self-sealing fuel cell, the sealant springs together quickly and closes the hole. The aircraft may then continue its mission. True 2. False The self-sealing fuel cells now in naval service are made up of what total number of primary layers of material? One 2. Two 3. Three 4. Four What is the main advantage of a bladder-type fuel cell over a self- sealing fuel cell? 1. Fewer inspections 2. Less total weight 3. Thicker wall construction 4. Slightly smaller than the aircraft cavity 4-60. 4-61. 4-62. When applying the nylon barrier of a rubber-type bladder fuel cell, you should NOT use which of the following methods of application? Swab 2. Brush 3. Spray 4. Roller The milled skins of an integral fuel cell are normally fastened to the aircraft by what means? 1. Pins 2. Bolts 3. Rivets 4. Screws A fuel leak that reappears 30 minutes after it is wiped dry is classified as what category of leakage? 1. Seep 2. Slow seep 3. Heavy seep 4. Running leak 4-63. What is the first step you should take to stop a fuel leak? 1. Reinject sealant around the perimeter of the cell 2. Replace the O-rings under all fasteners in the leak area 3. Retorque all fasteners 6 inches on either side of the leak area 4. Replace the Stat-O-Seal washers under all fasteners in the leak area 4-64. To allow the gun piston to return before another cycle can begin, the trigger of a sealant injector gun must be released approximately how often? Every 30 seconds 2. Every 45 seconds 3. Every 15 minutes 4. Every 20 minutes 4-65. To pressure test the repair made on an integral fuel cell, you should use what gas? 1. Oxygen 2. Dry air 3. Nitrogen 4. Natural gas 21 1. 1. 1. 1.