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2.38 TRANSFER MODULES.
The No. 1 and No. 2 transfer modules connect hydraulic pressure from the pump modules to the .ight control ser-vos. Each module is an integrated assembly of shutoff valves, pressure switches, check valves, and restrictors. The modules are interchangeable.
2.38.1 No. 1 Transfer Module. This module has a transfer valve, a pressure switch, a 1st stage primary shutoff valve, a 1st stage tail rotor shutoff valve, a restrictor, and check valves. The transfer valve is spring-loaded to the open or normal position. If 1st stage hydraulic pressure is lost, the valve automatically transfers backup pump pres-sure to the 1st stage system. The 1st stage primary shutoff valve lets the pilot or copilot shut off 1st stage pressure to the primary servos and prevents both stages from being shut off at the same time. The pressure switch lights the #1 HYD PUMP legend on the caution advisory display when pressure drops below 2000 psi and also sends a signal to a logic module that pressure is lost in the 1st stage hydraulic system. The restrictor allows .uid to circulate for cooling under no-.ow conditions. If a .uid leak develops past the transfer module, the check valves prevent .uid loss on the return side of the transfer module.
2.38.2 No. 2 Transfer Module. The No. 2 transfer module is like the No. 1 module except that it supplies 2nd stage pressure. The pilot assist shutoff valve turns off pres-sure to the pilot assist module. The 2nd stage primary servo shutoff valve turns off pressure to the 2nd stage of the pri-mary servos. The pressure switch turns on the #2 HYD PUMP caution legend on the caution/advisory display when 2nd stage system pressure is below 2000 psi, and also sends a signal to a logic module that pressure is lost in the 2nd stage system.
2.38.3 Utility Module. The utility module connects hy-draulic pressure from the backup pump to the No. 1 and No. 2 transfer modules, the 2nd stage of the tail rotor servo, and the APU accumulator. A pressure switch on the module senses the backup pump operating and turns on the BACK-UP PUMP ON advisory legend on the caution/ advisory display. If the .ow rate through the module to the APU accumulator goes over 1-1/2 gpm, a velocity fuse shuts off .ow.
2.38.4 Logic Modules. Two logic modules, one in the left relay panel and the other in the right relay panel, are used to control the operation of the hydraulic systems. The logic modules continually monitor the operation of the hy-draulic systems by inputs received from pressure switches, .uid level switches on the pump modules, and inputs re-ceived from control switches in the hydraulic system. The outputs of the logic modules will either turn on lights on the caution/advisory panel notifying the pilot of a failure, and/or turn off one or more valves due to a system mal-function. All switching functions of the hydraulic logic modules are automatic, except as shown by a dagger (.) which indicates crewmember action (Figure 2-13).
2.39 RESERVOIR FILL SYSTEM.
A handpump and manual selector valve are on the right side upper deck of the helicopter for system servicing. Re-fer to Figure 2-23 for servicing. The three hydraulic system reservoir levels can be seen from the .ll pump location. The handpump reservoir contains a sight gage above the handpump crank. A 1-quart level mark indicates a require-ment for re.ll. Refer to Section XV this chapter for servic-ing.
2.40 PNEUMATIC SUBSYSTEM.
A pneumatic subsystem operating from bleed-air fur-nished by the main engines, the APU, or an external pneu-matic power source, is used to drive the main engine starter, for heating system operation and external extended range tank fuel transfer. Bleed-air from the main engines is used for engine inlet anti-icing subsystem operation. The heating subsystem and the extended range fuel tanks use bleed-air supplied by the main engines during .ight, and on the ground by the main engines, APU, or external source. The subsystem contains check valves at each bleed-air source, and a shutoff valve at each main engine.
　
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