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Backup Pumps
Backup pumps for systems 1 and 2 are AC motor pumps (ACMP 1B and 2B). The operation of ACMP 1B and 2B depends on engine-driven generator output, hydraulic pump switch position, WOW, and the flap position. Pumps 1B and 2B are controlled by their respective three-position toggle switches on the HYDRAULIC panel, labeled AUTO, ON and OFF.
AUTO Position
With the switches in the AUTO position, the 1B and 2B pumps automatically start when their respective bus is powered, the associated 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.
Example (see Figure 13.10.2): When the 1B switch is set to AUTO, the pump will automatically start with its bus powered (AC BUS 2) when:
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The opposite engine-driven generator (GEN 2) is operating; and
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Flap position is not at zero (greater than 4°).
NOTE
ACMP 1B and 2B do not automatically start after an engine failure or an EDP failure.
HYDRAULIC POWER Description Vol. 2 13.10.3
Oct 05/06
Hydraulic System 1 Schematic . Shown In-Flight with Flaps Extended
Figure 13.10.2
Hydraulic System 2 Schematic . Shown In-Flight with Flaps Extended
Figure 13.10.3
HYDRAULIC POWER Description Vol. 2 13.10.4
Oct 05/06
ON Position
With the switches in the ON position, ACMP 1B and 2B will operate, provided their respective bus is powered and the associated cross-side engine-driven generator is operating. On the ground, an interlock circuit allows the pumps to operate when the ACMP switch is selected ON, even if the engine-driven generators are not operating (see Figure 13.10.2 and Figure 13.10.3).
Generator Output and Load Shedding
During normal operations, ACMP 1B operation is controlled by the electrical output of GEN 2, and ACMP 2B operation is controlled by the electrical output of GEN 1. In the event of an in-flight engine-driven generator malfunction or an engine failure, the control logic inhibits any operation of the opposite side ACMP. This function is called “load shedding”, and prevents an electrical overload condition during single-generator operation. The cross-side generator relationship with ACMP 1B and 2B ensures that a loss of system 1 and 2 pressure does not occur with any one of the above failures.
Hydraulic Shutoff Valves
Electrically operated hydraulic shutoff valves are installed in the suction lines of EDP 1A and 2A. Valve positions are indicated on the HYDRAULIC synoptic page. The valves are normally open. During an engine fire, the corresponding hydraulic shutoff valve is motored closed by pressing in the ENG FIRE PUSH switch/light (see Chapter 9, Fire Protection).
Accumulator and Reservoirs
Each system has an accumulator that stores nominal hydraulic pressure to satisfy instantaneous demands of aircraft systems, and to dampen pressure surges within the system. Each accumulator is precharged with nitrogen to 1,500 psi.
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