The pressure transmitter sends analog information of the air pressure in the reservoir of the Blue hydraulic system to the CFDS. The CFDS monitors the data from the transmitter during the flight phases 6 thru 9. If the data shows that the pressure is less than 3.1 bar absolute (45 psia) (2.1 bar relative (30 psig)), the CFDS gives a class 2 warning. This warning is shown on the STATUS page of the lower ECAM DU only after engine shut-down.
The fault logic has a 10 s delay. Thus, the system ignores decreases in pressure which only last a short time. The CFDS does not cause a fault warning because of a low-pressure input from the transmitter if there is:
-
a low air pressure discrete from the pressure switch 2384GH,
-
a low hydraulic pressure discrete from the pressure switch 2151GN.
R 1EFF : 103-105, 203-203, 1 29-34-00Page 11 1 1 May 01/05 1 1 1CES 1
ECAM (Flight) Warnings
Figure 004
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1 1 Feb 01/00
1 1
1CES 1
RESERVOIR PRESSURIZATION INDICATING - DEACTIVATION/REACTIVATION
_______________________________________________________________
TASK 29-34-00-040-001
Deactivation of the Reservoir Air Pressure Switches and Check of the Reservoir Air Pressure of the Green and Yellow Hydraulic System
1. Reason for the Job
__________________
Refer to the MMEL TASK: 29-30-04-B)
Indicating - Warning and Caution on ECAM
RSVR LO AIR PR
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific circuit breaker(s) safety clip(s)
No specific protective caps
No specific tie-wrap
No specific access platform 2.3 m (7 ft. 7 in.)
B. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
29-14-00-614-002 Pressurization of the Hydraulic Reservoirs through
the Ground Connector
32-12-00-010-001 Open the Main Gear Doors for Access
32-12-00-410-001 Close the Main Gear Doors after Access
R 29-34-00-991-001 Fig. 401 3. Job Set-up
__________
Subtask 29-34-00-865-050
A. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------FOR 1384GH
121VU HYDRAULIC/G HYD/PUMP ENG1/MONG 1702GK R34 FOR 3384GH 121VU HYDRAULIC/Y HYD/PUMP ENG2/MONG 3700GD Q37
Subtask 29-34-00-010-050
B. Get Access
(1)
Open the applicable access door:
-One main gear door for 1384GH (Ref. TASK 32-12-00-010-001). NOTE : Access is better from the Right Hand (RH) side.
____
-196BB and the RH main gear door for 3384GH (Ref. TASK 32-12-00-010-001).
(2)
Put an access platform in position to be satisfactory for the Green reservoir.
4. Procedure
_________
Subtask 29-34-00-040-050
A. Deactivation of the Reservoir Air Pressure Switches R (Ref. Fig. 401/TASK 29-34-00-991-001)
(1)
Disconnect the applicable electrical connector (1) 1384GH-A or 3384GH-A from the pressure switch.
(2)
Install the protective caps on the disconnected connector (1) and on the receptacle.
Reservoir Air Pressure Switches of the Green and Yellow Hydraulic System Figure 401/TASK 29-34-00-991-001
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(3) For the pressure switch 1384GH:
-Use a tie-wrap and attach the disconnected cable to a part of the structure.
NOTE : Attach the cable to the structure so that the disconnected end
____ of the connector points down. This prevents the contamination of the connector with oil or other liquids.
(4) For the pressure switch 3384GH:
(a)
Put the disconnected connector and the end of the cable through the hole in FR42 into the main gear compartment.
(b)
Use a tie-wrap and attach the disconnected cable to a part of the structure in the main gear compartment.
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