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AUTO
Controls the operation of the pump in the
following conditions:
• – When the correct electrical logic is set,
the pump will operate at normal operating
pressure.
• – Pump is inoperative.
• – Pump is in automatic/standby mode.
The pump will energize if the ACMP 3A pump
fails in flight, or when the correct logic is set
with slats/flaps not at 0-degree position.
For Training Purposes Only
Sept 04
12-23
P I LOT T R A I N I N G GU I D E
HYDRAULICS
GROUND OPERATION INHIBITS
When the APU is the airplane single source of electrical power, only one ACMP is
allowed to run at a time to prevent overloading the APU generator. The priority for
running the ACMPs are as follows:
• No. 1 priority - ACMP 3A
• No. 2 priority - ACMP 3B
• No. 3 priority - ACMP 2B
• No. 4 priority - ACMP 1B
If a lower priority ACMP is running and a higher priority ACMP is activated, the
lowest priority ACMP will shut off and the higher priority ACMP will turn on
automatically.
The B pump automatic start mode is inhibited when no engines are running to enhance
system safety during normal maintenance operations.
The B pumps will not come on automatically (AUTO mode selected) in support of a
primary pump failure on the ground.
All B pumps will be commanded on automatically (AUTO mode selected) when flaps/
slats are selected out of 0° and slats motion has stopped, and a minimum of two VFGs
are operating (i.e. all electrical buses powered).
FLIGHT OPERATION
The normal pump switch configuration in flight is AUTO mode of operation for
pumps 1B, 2B and 3B and ON selection for pump 3A.
The B pumps will come on automatically (AUTO mode selected) in support of the
applicable primary pump failure in flight. When an ACMP is commanded on due to a
low pressure condition of the primary pump, that ACMP will remain on for a
minimum of 5 minutes (including touchdown) unless ON or OFF is selected. This is
required to prevent ACMP overheating due to continuous restarts if the low pressure
alternates above and below 1800 psi.
During single VFG operation ACMPs 1B and 2B are load shed since their respective
buses are disconnected from the remaining good generator.
RAM AIR TURBINE (RAT)
When the RAT is deployed and on-speed, it will power the AC ESS bus and the
independent RAT hydraulic pump, to ensure that system 3 components are powered at
all times (see hydraulic synoptic page in this chapter).
P I LOT T R A I N I N G GU I D E
HYDRAULICS
12-24 For Training Purposes Only
Sept 04
ACMP POWER AND DISTRIBUTION
Electrical power and distribution using the ACMPs are described as follows:
ACMP’S 1B AND 2B
Hydraulic systems 1 and 2 are each powered by one EDP used as the primary system
pump. Each primary pump is backed up by a single ACMP (one per system) during
high flow demand flight phases or failure of the primary pump in flight.
The ACMPs are also used for system ground maintenance operation with the control
switch in the ON position. Each ACMP is powered by one of the electrical AC buses
supplied by both an onside generator(s) and cross-side generator(s) (ACMP 1B is
connected to AC bus 3. AC bus 3 is normally powered by its own generator (No. 3)
but is backed up by, in priority, generators 2, 1 and APU). This will ensure operation
of both hydraulic systems 1 and 2 in the case of a single engine failure.
When only one generator is operating, AC buses 2 and 3 are shed. Since their
respective AC buses are disconnected during single generator operation, ACMPs 1B
and 2B are automatically load shed.
ACMP’S 3A AND 3B
Hydraulic system 3 is powered by two ACMPs, 3A as the primary system pump and
3B as the backup pump. Each pump is powered by a different AC bus (ACMP 3A is
connected to AC bus 4 and ACMP 3B is connected to AC bus 1). In the event of one,
two or three generator failures, both 3A and 3B ACMPs will receive power from the
remaining generator. AC bus 1 and AC bus 4 are both powered during single generator
operation.
For Training Purposes Only
Sept 04
12-25
P I LOT T R A I N I N G GU I D E
HYDRAULICS
ACMP ELECTRICAL POWER SCHEMATIC
EXTERNAL AND APU POWER-ACMP OPERATION
External AC power has the capability to power all ACMPs for ground operation when
the hydraulic control switch is selected to the ON position.
During ground operation with either the APU or external ground power as the source
of electrical power, the AUTO mode of operation is not available. On ground with
APU as the single source of electrical power, only one pump at a time is allowed to run
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