(14)
Slowly pressurize the Green hydraulic system with the ground cart until the PTU starts to operate (Ref. TASK 29-10-00-863-001).
(15)
Let the PTU operate for a minimum of 5 minutes.
(16)
Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(17)
On the panel 40VU:
(a)
Push the PTU P/BSW.
(b)
Make sure that the OFF light of the PTU P/BSW comes on.
(18)
Make sure that the PTU stops.
(19)
Depressurize the Green hydraulic system (Ref. TASK 29-10-00-864-001).
(20)
On the panel 40VU:
(a)
Push the PTU P/BSW.
(b)
Make sure that the OFF light of the PTU P/BSW goes off.
(21)
Pressurize the Yellow hydraulic system with the E-pump (Ref. TASK 29-24-00-863-001).
(22)
Make sure that the PTU starts to operate.
(23)
Let the PTU operate for a minimum of 5 minutes.
(24)
Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(25)
On the panel 40VU:
(a)
Push the PTU P/BSW.
(b)
Make sure that the OFF light of the PTU P/BSW comes on.
(26)
Make sure that the PTU stops.
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(27)
Depressurize the Yellow hydraulic system (Ref. TASK 29-24-00-864-001).
(28)
De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
Subtask 29-23-41-870-051
D. Bleeding Procedure of the PTU with the left Engine Pump and the Electric Pump of the Yellow Hydraulic System
WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS ARE
_______ CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE.
CAUTION : DO NOT START OR DRY MOTOR THE ENGINES WITH A HYDRAULIC GROUND
_______ POWER SUPPLY CONNECTED TO THE AIRCRAFT. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE ENGINE PUMPS.
(1)
Make sure that the isolation coupling of the PTU is connected.
(2)
Make sure that the parking brake is in the OFF position.
(3)
Make sure that the nose wheel steering is not deactivated.
(4)
Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
(5)
On the panel 40VU:
(a) Make sure that the OFF light of the PTU P/BSW is on.
(6)
Pressurize the Yellow hydraulic system with the E-pump (Ref. TASK 29-24-00-863-001).
(7)
Pressurize the Green hydraulic system by dry motoring the left engine for a maximum of 4 minutes (Ref. TASK 71-00-00-710-001).
NOTE : When you do the dry motoring, obey the starter limits.
____
(8) Make sure that the pressure in the hydraulic systems is approximately 3000 psi (206.8427 bar).
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(9) On the panel 40VU:
(a)
Push the PTU P/BSW.
(b)
Make sure that the OFF light of the PTU P/BSW goes off.
(10)
Make sure that the PTU does not start.
(11)
Keep the hydraulic systems pressurized for a minimum of 3 minutes.
(12)
Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(13)
Stop the dry motoring of the left engine after 4 minutes (Ref. TASK 71-00-00-710-001).
(14)
Make sure that the PTU starts to operate.
(15)
Let the PTU operate for a minimum of 5 minutes.
(16)
Examine the hydraulic connections of the PTU and make sure that there are no leaks.
(17)
On the panel 40VU:
(a)
Push the PTU P/BSW.
(b)
Make sure that the OFF light of the PTU P/BSW comes on.
(18)
Make sure that the PTU stops.
(19)
Depressurize the Yellow hydraulic system (Ref. TASK 29-24-00-864-001).
(20)
On the panel 40VU:
(a)
Push the PTU P/BSW.
(b)
Make sure that the OFF light of the PTU P/BSW goes off.
(21)
Pressurize the Green hydraulic system by dry motoring the left engine for a maximum of 4 minutes (Ref. TASK 71-00-00-710-001).
NOTE : When you do the dry motoring, obey the starter limits.
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