(5)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
(6)
Make sure that the work area is clean and clear of tool(s) and other items.
(7)
Close the access panel 196BB.
RESERVOIR PRESSURIZATION INDICATING - DESCRIPTION AND OPERATION
_______________________________________________________________
1. General
_______
The reservoir pressurization indicating system monitors the internal
pressure of the hydraulic reservoirs. If the pressure in one or more of the
reservoirs is too low, the indicating system gives signals. These signals
give warnings during flight (for immediate action) and after flight (for
maintenance action).
2. Component Location
__________________
**ON A/C 001-049, 051-061, 101-105, 201-203,
(Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA
| | | | DOOR | REF. -------------------------------------------------------------------------------1384GH PRESS SW-G RSVR AIR 148 734 29-34-11 2384GH PRESS SW-B RSVR AIR 197 197FB 29-34-11 3384GH PRESS SW-Y RSVR AIR 196 196BB 29-34-11 2387GH PRESS SW-B RSVR AIR 197 197FB 29-34-11
R **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,
(Ref. Fig. 001A)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA
| | | | DOOR | REF. -------------------------------------------------------------------------------1384GH PRESS SW-G RSVR AIR 148 734 29-34-11 2384GH PRESS SW-B RSVR AIR 197 197FB 29-34-11 3384GH PRESS SW-Y RSVR AIR 196 196BB 29-34-11
**ON A/C ALL
3. System Description
__________________
Component Location Figure 001
R 1EFF : 1 1 1CES 001-049, 051-061, 101-105, 201-203, 1 111 29-34-00 Page 2 May 01/05
Component Location
Figure 001A
R 1EFF : 062-099, 106-149, 151-199, 204-299, 1 29-34-00Page 3 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1 **ON A/C 001-049, 051-061, 101-105, 201-203,
The reservoir pressurization indicating system has four pressure switches. One pressure switch is installed on the reservoir of each hydraulic system and is connected directly to its air space. The fourth pressure switch is on the air manifold of the reservoir of the Blue hydraulic system.
Each pressure switch (1384GH), (2384GH) and (3384GH) sends a discrete signal if the pressure in the related reservoir is too low. The signal goes to the two system data acquisition concentrators (SDAC) for electronic centralized aircraft monitor (ECAM) warnings. The signal also goes to the overhead panel for FAULT light operation.
The pressure switch 2387GH which is installed only in the Blue hydraulic system sends a discrete signal through some relays to the SDAC. If the air pressure in the Blue reservoir decreases to less than 3.1 bar absolute (45 psia) (2.1 bar relative (30 psig)), the pressure switch gives a signal in flight (flight phases 5, 6 and 7) which is then memorized only and displayed after landing (flight phases 8, 9 and 10).
R **ON A/C 062-099, 106-149, 151-199, 204-299, 301-399, 401-499,
The reservoir pressurization indicating system has three pressure switches. One pressure switch is installed on the reservoir of each hydraulic system and is connected directly to its air space.
Each pressure switch (1384GH), (2384GH) and (3384GH) sends a discrete signal if the pressure in the related reservoir is too low. The signal goes to the two system data acquisition concentrators (SDAC) for electronic centralized aircraft monitor (ECAM) warnings. The signal also goes to the overhead panel for FAULT light operation.
**ON A/C ALL
4. Component Description
_____________________
(Ref. Fig. 002)
A. Reservoir Air Pressure-Switches 1384GH, 2384GH, 3384GH
The three reservoir air pressure-switches are the same and they are interchangeable. The switches are cylindrical with a steel body. The body holds a microswitch assembly. At one end of the body is the electrical connector. The other end of the body has a thread to connect it to the reservoir. It is also the pressure inlet. A bonding tag is attached to the body.
The contacts of the pressure switch close when the pressure decreases to
2.5 +/- 0.1 bar absolute (37 +/- 1.45 psia) (1.5 +/- 0.1 bar relative (22 +/- 1.45 psig)). The contacts open when the pressure increases to 2.7 bar absolute (40 psia) (1.7 bar relative (25 psig)).
R **ON A/C 001-049, 051-061, 101-105, 201-203,
B. Reservoir Air Pressure-Switch 2387GH The switch is cylindrical with a steel body. The body holds a microswitch assembly. At one end of the body is the electrical connector. The other end of the body has a thread to connect it to the reservoir. It is also the pressure inlet. A bonding tag is attached to the body.
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