The following listed caution legends may momentarily .icker when the applicable listed switch is activated; this is considered normal.
SUBSYSTEM  CAUTION LEGEND
SAS 1 or SAS 2 switch #2 PRI SERVO PRESS
ON #2 HYD PUMP
BOOST SERVO OFF

BOOST switch ON  #2 PRI SERVO PRESS
#2 HYD PUMP
SAS OFF

SUBSYSTEM  CAUTION LEGEND
TAIL SERVO switch  #1 PRI SERVO PRESS
BACKUP  #1 HYD PUMP
HYD LEAK TEST  #1 and #2 PRI SERVO
switch NORM after  PRESS
RESET  #1 and #2 HYD PUMP
2.36 HYDRAULIC PUMP MODULES.
The hydraulic pump modules are combination hydraulic pumps and reservoirs. The No. 1, No. 2, and backup pump modules are identical and interchangeable with each other. The No. 1 pump module is mounted on and driven by the left accessory module of the main transmission. The No. 2 pump module is mounted on and driven by the right acces-sory transmission module. The backup pump module is mounted on and driven by an ac electric motor. The reser-voir part of each pump module has a level indicator win-dow marked, REFILL, FULL, and EXPANSION. A pres-sure relief and bleed valve protects the pump from high pressure in the return system. The pump has two .lters: a pressure .lter and a return .lter. A red indicator button on each .lter will pop out when pressure goes up 70 610 psi above normal. The pressure .lter has no bypass. The return .lter has a bypass valve that opens when return pressure reaches 100 610 psi above normal. Each pump has three check valves: one at the external ground coupling, one at the pressure side, and one at the return side. A .uid quan-tity switch, mounted on top of each pump module, senses .uid loss for that system. When the piston in the pump module moves down to the REFILL mark, the piston closes the switch, turning on a caution legend marked RSVR LOW. Each hydraulic pump has two temperature sensitive labels mounted on the side. When a temperature level is reached a circle turns black. There are two types of labels used on the pumps. When the temperature label in-dicates that a temperature of 132°C (270°F) has been ex-ceeded, an entry shall be made on DA Form 2408-13-1. The aircraft should not be .own until appropriate mainte-nance action has been taken.
2.36.1 Number 1 Hydraulic System. Number 1 hy-draulic system operates with the rotor turning, and supplies the .rst stage of all primary servos and the .rst stage of the tail rotor servo. The system components are an integrated pump module, a transfer module, .rst stage primary servos, and .rst stage tail rotor servo. The primary servos are con-trolled by the SVO OFF switch (Figure 2-11). The switch can turn off either .rst or second stage of the pri-
2-38 Change 2
mary servos but not both at the same time. First stage tail rotor servo can be manually turned off by a two-position switch marked TAIL SERVO, on the miscellaneous switch panel (Figure 2-7). If the .uid quantity of the number one pump reservoir becomes low, a microswitch will complete an electrical circuit to close the .rst stage tail rotor servo valve. If .uid continues to be lost and the #1 HYD PUMP caution legend goes on, the .rst stage tail rotor shutoff valve will open, allowing backup pressure to supply .rst stage tail rotor. The logic modules automatically control the hydraulic system. The tail rotor servo is a two-stage servo but, unlike the primary servos, only one stage is pressurized at a time.
2.36.2 Number 2 Hydraulic System. The number 2 hydraulic system, which also operates with the rotor turn-ing, supplies the second stage primary servo and the pilot-assist servos. System components are the integrated pump module, transfer module, second stage primary servos, and pilot-assist modules. Second stage primary servos can be manually turned off by the SVO OFF switch. The pilot-assist servos cannot be turned off collectively, but SAS, TRIM and BOOST servos can be manually turned off by switches on the AUTO FLT CONT panel. If .uid quantity of the number two pump reservoir becomes low, the pilot-assist servo becomes inoperative. If .uid continues to be lost, the #2 HYD PUMP caution legend will go on.
　
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