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CYLINDER EXPANSION AND ELONGATION INDICATORS
Catapult Trough Covers

Aviation Boatswains Mate E 3 & 2 - Aviation theories and other practices
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1. Inner male guide 4. Scale 2. Deck 5. Pointer assembly 3. Slot Figure 4-15.—Expansion indicators. 6. Support 7. 9-foot cylinder expansion indicators move with the cylinders, and expansion can be measured directly by reading the scale beside the pointer. The cylinder elongation indicators (fig. 4-16) provide a remote indication of power cylinder elonga- tion (expansion). The elongation indicators function mechanically. A bracket attached to the forward power cylinder extends through the trough wall. A round shaft of thermally stable material is attached to the bracket and extends aft, where it connects with a mechanical indicator attached to the trough wall near the launching valve assembly. Movement of the forward cylinder is transferred to a pointer, which moves along a fixed scale and indicates the cylinder elongation position limit switch when the desired elongation is obtained. LUBRICATION SYSTEM The lubrication system provides lubricating oil for launching engine cylinder walls by injecting lubricating oil through the cylinder covers, with a spray pattern that ensures even lubrication of the cylinder walls before passage of the launching engine pistons. Lubrication is accomplished automatically during catapult operations. On the C-11 and C-7 types of catapults, it occurs when the crank on the main control console is rotated from the FIRST READY position to the FINAL READY position and again when it is rotated from HALF CYCLE to RETRACT. Lubrication is accomplished automatically on the C-13-type catapults when an electrical solenoid valve is energized at the FINAL READY and RETRACT CATAPULT conditions. It can also be accomplished manually by pushing the LUBRICATION push button on the control console. Manual lubrication can be accomplished on the C-11 and C-7 catapults by rotating the crank on the console back and forth from the FIRST READY to the FINAL READY position if the grab is aft, or from the HALF CYCLE to the STOW position if the grab is forward. Manual lubrication is required prior to maneuvering the shuttle for other than a short distance. Catapult Trough The catapult trough, recessed in the flight deck, contains the launching cylinders, cylinder foot stools, 4-14







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