3. Job Set-up
__________ Subtask 29-23-00-860-054
A. Aircraft Maintenance Configuration
(1)
Make sure that the isolation coupling of the Power Transfer Unit (PTU) is connected (Ref. TASK 29-23-00-860-002).
(2)
Energize the electrical circuits (Ref. TASK 24-41-00-861-002).
(3)
Set the ECAM system to on (Ref. TASK 31-60-00-860-001).
(4)
On the ECAM control panel on the center pedestal, press the HYD pushbutton switch (P/BSW). Make sure that the HYD page is shown on the ECAM lower DU.
(5)
Make sure that the ECAM does not show one of these conditions:
-
Green or Yellow reservoir, low air pressure,
-
Green or Yellow reservoir, low fluid contents.
(6)
If necessary, pressurize the reservoir (Ref. TASK 29-14-00-614-002).
(7)
If necessary, add fluid to the reservoir (Ref. TASK 12-12-29-611-001) or (Ref. TASK 12-12-29-611-002).
(8)
On the panel 400VU make sure that the landing gear lever is in the DOWN position.
(9)
On the panel 40VU make sure that the PTU P/BSW is set to AUTO.
(10) On the panel 40VU make sure that the YELLOW ELEC PUMP P/BSW is set to OFF.
Subtask 29-23-00-865-051
B. Make sure that this(these) circuit breaker(s) is(are) closed:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU HYDRAULIC/G HYD/PUMP ENG1/CTL 1701GK R35 121VU HYDRAULIC/G HYD/PUMP ENG1/MONG 1702GK R34
4. Procedure
_________
(Ref. Fig. 201/TASK 29-23-00-991-001)
Subtask 29-23-00-863-053
A. Pressurization of the Yellow Hydraulic System from the Green System
through the PTU with the Ground Service Cart
CAUTION : DO NOT CONNECT GROUND POWER SUPPLIES TO THE GREEN AND YELLOW
_______ HYDRAULIC SYSTEMS AT THE SAME TIME. THIS COULD CAUSE:
-THE PTU TO OPERATE TOO FAST
-DAMAGE TO THE PTU IF ONE GROUND POWER SUPPLY IS IN OPERATION AND THE OTHER IS IN THE BY-PASS MODE.
NOTE : To prevent damage to the PTU:
____
-make sure that the air pressure in the Green and Yellow reservoirs does not fall below 3 bar (43.5113 psi),
-limit the flow of the ground hydraulic supply to max 76 l.min (20.0769 USgal.mn).
(1)
Pressurize the Green hydraulic system (Ref. TASK 29-10-00-863-001).
(2)
Make sure that the ECAM lower DU shows:
-
that the pressure of the Green hydraulic system is 3000 psi approximately,
-
that the pressure of the Yellow hydraulic system is 3000 psi approximately.
NOTE : The PTU pressurizes the system to a nominal pressure of 3000
____ psi, but if no consumers are operated the pressure is not constant. The PTU operates in a cycle which keeps the pressure in the Yellow hydraulic system between 2100 and 3150 psi.
NOTE : When the Green system is pressurized with a ground supply the
____ PTU "direction" arrows on the ECAM show the wrong indication. Flow from Yellow to Green is shown. This only happens when the aircraft is supplied from a ground supply. It does not mean that the ECAM system is defective.
TASK 29-23-00-864-001 Depressurize the Green and Yellow Hydraulic Systems after Operation of the PTU
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