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System 1 and 2 reservoirs are hydraulic fluid storage tanks. Each reservoir is a sealed unit, and is filled via the ground service panel, located directly below the hydraulic equipment rack in the aft equipment bay. System 1 reservoir has a capacity of 2.95 liters (0.78 U.S. gal). System 2 reservoir has a capacity of 3.93 liters (1.04 U.S. gal).
During preflight, a visual inspection should include checks for fluid leaks, and accumulator pressure at 1,500 psi. As well, reservoir quantity, overflow containers and filter bypass indicators should be checked (see Figure 13.10.4).
HYDRAULIC POWER Description Vol. 2 13.10.5
Oct 05/06
Hydraulic systems are serviced with Skydrol-B, a fire-resistant fluid easily identified by its purplish color. It is highly corrosive, and can produce severe skin and eye irritation. Avoid direct exposure to the fluid.
Hydraulic System 2 Equipment Rack
Figure 13.10.4
SYSTEM 3
Description
The major components of hydraulic system 3 are two AC motor pumps (ACMP 3A and 3B), an accumulator and a reservoir. ACMP 3A and 3B are located in the left and right side fillets of the aft belly fairing, respectively. The accumulator, reservoir and ground service panel are located in the right main wheel well (see Figure 13.10.6).
HYDRAULIC POWER Description Vol. 2 13.10.6
Oct 05/06
Hydraulic System 3 Schematic . Shown In-Flight with Flaps Extended
Figure 13.10.5
Components and Operation
Main Pump
The main pump for system 3 is AC motor pump 3A (ACMP 3A). A two-position toggle switch on the HYDRAULIC panel, labeled ON and OFF, controls the 3A pump. The 3A pump operates continuously with the switch in the ON position, provided AC BUS 2 is powered (see Figure 13.10.5).
Backup Pump
The backup pump for system 3 is AC motor pump 3B (ACMP 3B). The operation of ACMP 3B depends on hydraulic pump switch position, flap position, engine-driven generator 1 or 2 output, and emergency power mode activation (ADG deployment). The 3B pump is controlled by a three-position toggle switch on the HYDRAULIC panel, labeled AUTO, ON and OFF.
AUTO Position
With the switch in the AUTO position, the 3B pump operates when AC BUS 1 is powered, either engine-driven generator is operating, and the flaps are not at zero (flap position is greater than 4°). AUTO is the normal switch position for flight operations.
NOTE
ACMP 3B does not automatically start after ACMP 3A failure.
HYDRAULIC POWER Description Vol. 2 13.10.7
Oct 05/06
ON Position
With the ACMP 3B switch in the ON position, the 3B pump will operate, provided AC BUS 1 is powered.
ADG Deployment
During ADG deployment, ACMP 3B is automatically energized, regardless of its switch position, by the ADG BUS through the hydraulic pump transfer contactor. This ensures that hydraulic system 3 is available when AC BUS 1 and 2 are unpowered. If AC power is subsequently restored by an engine-driven generator or the APU generator, ACMP 3B will return to normal operation when the PWR TXFR OVERRIDE switch is selected. For additional information on the PWR TXFR OVERRIDE switch, see Chapter 7, Electrical.
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