*
HYDIM center right (CR).
HYDIM L controls the functions for the left system. HYDIM R controls the functions for the right system. HYDIM CL and CR control the functions for the center system.
The HYDIM cards are interchangeable. Card position in the card file determines the function of the card.
HYDIM sends and receives some signals directly through hard wires.
HYDIM also sends and receives signals through the left and right systems ARINC 629 buses through the ARINC signal gateway (ASG) cards.
Location
The HYDIM cards are in the P85 left systems card file and the P84 right systems card file.
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MAIN HYDRAULIC SYSTEMS -HYDRAULIC INTERFACE MODULE CARDS
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MAIN HYDRAULIC SYSTEMS -HYDRAULIC INTERFACE MODULE CARDS -FUNCTIONAL DESCRIPTION
General
Four HYDIM cards in the system card files monitor and control the hydraulic system and do other functions.
The HYDIM cards send and receive some data through ARINC 429 buses to the ARINC signal gateway (ASG) cards. The ASG cards send and receive data through the systems ARINC 629 buses.
The HYDIM cards also send and receive data through hard wires.
Control Functions
The HYDIM cards control these functions:
*
Demand pump (L, R ACMP; ADP C1, C2) AUTO operation
*
Reserve and NG isolation valve operation
*
Landing gear auto-off (MLG and NLG selector/bypass valves)
*
RAT auto deploy.
Indications
HYDIM supplies these hydraulic system indications through AIMS:
*
System pressures
*
Pump pressures
*
Reservoir pressures
*
Pump temperatures
*
Reservoir fluid temperatures
*
Reservoir quantities
*
RAT locked status
*
Valve positions.
HYDIM also does these functions:
*
Hydraulic system fault detection
*
Monitor EDP supply shutoff valve positions
*
Monitor truck tilt pressures
*
Monitor flight control shutoff valve positions.
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MAIN HYDRAULIC SYSTEMS -HYDRAULIC SYSTEM RESERVOIRS
Purpose
The hydraulic reservoirs supply hydraulic fluid under pressure to the hydraulic pumps. The reservoirs also get the return hydraulic fluid from the airplane systems that use hydraulic power.
Physical Description
The left and right system reservoirs are the same. Each has a total volume of 12.6 gallons (47.8 liters) and normally contains
7.4 (28 liters) gallons of hydraulic fluid.
The center system reservoir has a total volume of 25.6 gallons (97 liters) and normally contains 11 gallons (41.7 liters) of hydraulic fluid.
Each reservoir has these components:
*
Reservoir pressure relief valve
*
Sight glasses (low and overfull)
*
Reservoir sample valve
*
Reservoir drain valve
*
Reservoir temperature transducer
*
Reservoir quantity transmitter.
Location
The left hydraulic system reservoir is in the left engine aft strut fairing.
EFFECTIVITY
BEJ ALL
The right hydraulic system reservoir is in the right engine aft strut fairing.
The center system reservoir is in the aft part of the right wheel well.
Functional Description
The reservoirs are pressurized by the bleed air system for positive supply to the pumps.
The reservoirs have an internal trap to make sure fluid goes to the pumps during negative-G conditions.
Each reservoir also has a standpipe. For the left and right reservoirs there are 2 gallons (7.6 liters) of fluid below the standpipe. The EDPs get a fluid supply from the standpipe. A port at the bottom of the reservoir supplies fluid to the ACMPs.
For the center hydraulic system, there are 1.2 gallons (4.5 liters) below the standpipe. The standpipe supplies the fluid to ACMP 2, to both ADPs, and to the RAT. ACMP 1 gets fluid from the bottom of the reservoir.
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