-
the pressure transmitter 3068GN
(1) Alternate Selector Valve 99GG
(Ref. Fig. 010)
The description of the alternate selector valve is the same as the normal selector valve 23GG (Ref 32-42-00-00).
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Brake Yellow Pressure Transducers 100GG and 101GG
Figure 008
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Alternate HP Manifold Assembly
Figure 009
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Alternate Selector Valve 99GG
Figure 010
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(2) Pressure Relief Valve 3067GM
(Ref. Fig. 011)
The pressure relief valve returns the fluid directly to the reservoir
in the case of overpressure.
It limits the pressure to 237 bars (3436 psi) if a thermal expansion
occurs, and is also used for manual pressure release.
(3)
Check Valve 3058GM (Ref. Fig. 012) The check valve isolates the supply line
(4)
Yellow Accumulator Pressure Transmitter 3068GN
(Ref. Fig. 013)
It is installed in the common supply line.It transmits data on the hydraulic fluid pressure to the third input of the brake Yellow-pressure triple indicator and to the ABCU.
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Pressure Relief Valve 3067GM
Figure 011
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Check Valve 3058GM
Figure 012
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1 1 Config-2 Aug 01/05
1 1
1CES 1
Yellow ACCU Pressure Transducer 3068GN
Figure 013
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C. Alternate Brake Yellow - HP Filter 2862GM
(Ref. Fig. 014)
The filter is installed in belly fairing area between frames C46 and C47 right side. It is the same as the Normal HP Filter (Refer to 32-42-00-00).
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Alternate Yellow HP Filter 2862GM
Figure 014
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(Ref. Fig. 015)
The Alternate Brake Pedal Transmitter Unit is located at the captains
pedals. It transmits the manual braking inputs to the ABCU. It is the
same as the Normal Brake Pedal Transmitter Unit 9GC (Refer 32-42-00-00).
Two sets of potentiometers are used for alternate braking, a third set is
used for braking during Towing operation.
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Alternate Brake Pedal Transmitter Unit 103GG
Figure 015
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E. Alternate Braking Control Unit 95GG (ABCU)
(Ref. Fig. 016)
(1) General
(Ref. Fig. 017)
The ABCU is located in the right hand avionics bay.
The ABCU controls and monitors the alternate braking system with and
without anti-skid protection.
When NORMAL system is activated, braking control and antiskid
protection are provided by the BSCU.
When ALTERNATE braking circuit is activated, braking control is
provided by the ABCU.Antiskid protection is still provided by the
BSCU, which sends antiskid orders to the ABCU.
When PARKING brake circuit is activated , braking is controlled
directly by the PARKING brake circuit.
The ABCU is automatically activated if:
-
the A/SKID & N/W STRG switch is selected to OFF position
-
the BSCU is not serviceable (both system 1 and 2 failures)
-
the normal braking system has failed
- only the batteries supply the aircraft.
(2) Alternate Braking
When ALTERNATE braking is activated:
-
The ABCU energises the alternate brake selector valve and indicates to the BSCU that braking is activated on the ALTERNATE braking system.
-
The ABCU determines the braking orders according to the brake pedal deflections measured by the brake pedal transmitter unit.
-
The ABCU determines if antiskid protection is inhibited according to a predeterminated logic.If antiskid protection is not inhibited, the unit combines these braking orders with the antiskid orders sent by the BSCU.
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