Brake Pressure Yellow Accumulator
Figure 006
1EFF : 401-499, 1 32-44-00Page 12 1 1 Config-2 Aug 01/05 1 1 1CES 1
7. Operation/Control and Indicating________________________________
(Ref. Fig. 007)
The system is active when the WHEEL page shows that the anti skid function is not available (legend ANTI SKID in amber). When a braking input is made at the brake pedals it causes an output from the active transmitter unit (BPTU). The transmitter unit 103GG at the captains position sends its outputs to the ABCU.
The braking inputs cause the ABCU to energize the alternate brake selector valve 99GG to let hydraulic pressure go to the system. When this occurs the components in the system downstream of the selector valve operate as described in 32-43-00. The Direct Drive Valves (DDVs) are controlled to give a maximum brake pressure of 70 bar (1000 psi).
When the brake pedals are released:
-
the brake selector valve is de-energized to stop the hydraulic supply
-
the DDVs are de-energized to connect the brake service lines to the return manifold
-
the pressure at the brakes is maintained to a minimum pressure in order not to waste the limited fluid capacity of the accumulator to fill the brakes against next pedal application.
1EFF : 401-499, 1 32-44-00Page 13 1 1 Config-2 Aug 01/05 1 1 1CES 1
System Display - Wheel page
Figure 007
1EFF : 401-499, 1 32-44-00Page 14 1 1 Config-2 Aug 01/05 1 1 1CES 1 1EFF : ALL 1 32-44-00Page 501 1 1 Aug 01/05 1 1 1CES 1R B. Referenced Information
ALTERNATE BRAKING WITHOUT ANTI SKID - ADJUSTMENT/TEST_____________________________________________________
R **ON A/C 401-499,
R TASK 32-44-00-710-002
R Operational Test of Alternate Braking System without Anti Skid
R WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING_______
R GEAR.
R WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE_______
R CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
R WARNING : MAKE SURE THAT THE CONTROLS AGREE WITH THE POSITION OF THE ITEMS THEY_______
R OPERATE BEFORE YOU PRESSURIZE A HYDRAULIC SYSTEM.
R WARNING : PRESSURIZE ONLY THE HYDRAULIC SYSTEM(S) THAT IS (ARE) NECESSARY FOR_______
R THE TASK. ISOLATE THE OTHER HYDRAULIC SYSTEM(S) BEFORE YOU SUPPLY
R HYDRAULIC POWER TO THE AIRCRAFT.
R 1. Reason for the Job__________________
R Self Explanatory
R 2. Job Set-up Information______________________
R A. Fixtures, Tools, Test and Support Equipment
R -------------------------------------------------------------------------------
R REFERENCE QTY DESIGNATION
R -------------------------------------------------------------------------------
R No specific warning notice(s)
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R 24-41-00-861-002 R R 24-41-00-862-002 R R 29-10-00-863-002 R 29-10-00-864-001 R 29-23-00-864-001 R
R 3. Job Set-up
__________
R Subtask 32-44-00-865-051 Energize the Aircraft Electrical Circuits from the External Power De-energize the Aircraft Electrical Circuits Supplied from the External Power Pressurize the Yellow Hydraulic System Depressurize the Green Hydraulic System Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
R A. Make sure that this(these) circuit breaker(s) is(are) closed:
R -------------------------------------------------------------------------------R PANEL DESIGNATION IDENT. LOCATION R -------------------------------------------------------------------------------R 49VU ABCU &/Y BRK/PRESS IND 61GG C10 R 121VU HYDRAULIC/BRAKING AND STEERING/SYS2/SPLY 4GG M36 R 121VU HYDRAULIC/BRAKING AND STEERING/SYS2/CTL 3GG M35 R 121VU HYDRAULIC/BRAKING AND STEERING/SYS1/CTL 1GG M34 R 121VU HYDRAULIC/BRAKING AND STEERING/SYS1/IND AND/SPLY 2GG M33
R Subtask 32-44-00-860-053
R B. Aircraft Maintenance Configuration
R (1) Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-R 002).
R (2) On the panel 400VU, make sure that the Landing Gear control lever is R at DOWN.
R (3) On the panel 402VU, make sure that the A/SKID & N/W STRG switch is at R OFF.
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