(a)  
All the landing gear is down.

 (b)  
All the landing gear doors are closed.

 (c)  
The airplane steering is in neutral.

 (d)  
The spoilers are retracted.

 (e)  
The airplane is chocked.

 S 863-083
 (3)  
Make sure the ground lockpins for the landing gear are installed (AMM 09-11-00/201).

 S 983-084

 (4)  
Procedure 1 (Transfer fluid from system 2 to system 1).

 (a)  
Release the parking brake.

 (b)  
Remove the pressure from hydraulic system 4 (AMM 29-11-00/201).

 (c)  
Pressurize hydraulic system 2 to 3000 psi (AMM 29-11-00/201).

 (d)  
Set the parking brake.

 (e)  
Pressurize hydraulic system 1 to 3000 psi (AMM 29-11-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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MAINTENANCE MANUAL

 (f) (g)  Remove the pressure from hydraulic system 2 (AMM 29-11-00/201).Let the pressure in hydraulic system 2, which shows on the EICAS, decrease to 1000 psi.
 NOTE:____ You can operate the flight controls to release the pressure faster.
 (h) (i)  Release the parking brake.Repeat steps (b) through (h) until the HYD QTY on the EICAS display shows .80 to 1.10 or the reservoir fill gauge is in the green band.
 NOTE:____ Approximately 68 cubic inches, 0.3 US Gallons should be transfered each time the sequence is repeated.
 (5)  S 213-134Make sure the OF, RF, or LO indication does not show on the EICAS maintenance page adjacent to the HYD QTY (1, 2, 3, 4).
 (6)  S 213-085Make sure the system 2 quantity, which shows on the EICAS, does not drop below 0.80, and the system 1 quantity, which shows on the EICAS, does not go above 1.10.
 (7)  S 863-086Remove the hydraulic power if it is not necessary (AMM 29-11-00/201).
 (8)  S 863-087Remove the electrical power if it is not necessary (AMM 24-22-00/201).
 (9)  S 983-104Procedure 2 (Transfer fluid from system 1 to system 2).
 (a) (b) (c) (d) (e) (f) (g)  Release the parking brake.Remove the pressure from hydraulic system 4 (AMM 29-11-00/201).Pressurize hydraulic system 1 to 3000 psi (AMM 29-11-00/201).Set the parking brake.Pressurize hydraulic system 2 to 3000 psi (AMM 29-11-00/201).Remove the pressure from hydraulic system 1 (AMM 29-11-00/201).Let the pressure in hydraulic system 1, which shows on the EICAS, decrease to 1000 psi.
 NOTE:____ You can operate the flight controls to release the pressure faster.
 (h)  Release the parking brake.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 12-12-01
 ALL  ú ú 01 Page 310 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (i)  Repeat steps (b) through (h) until the HYD QTY on the EICAS display shows .80 to 1.10 or the reservoir fill gauge is in the green band.
 NOTE: Approximately 68 cubic inches, 0.3 US Gallons should
____ be transfered each time the sequence is repeated.
 S 213-135
 (10)
 Make sure the OF, RF, or LO indication does not show on the EICAS maintenance page adjacent to the HYD QTY (1, 2, 3, 4).

 S 213-105

 (11)
 Make sure the system 1 quantity, which shows on the EICAS, does not drop below 0.80, and the system 2 quantity, which shows on the EICAS, does not go above 1.10.

 S 863-106

 (12)
 Remove the hydraulic power if it is not necessary (AMM 29-11-00/201).

 S 863-107

 (13)
 Remove the electrical power if it is not necessary (AMM 24-22-00/201).

 S 983-100

 (14)
 Procedure 3 (Transfer fluid from system 1 to system 4).

 (a)  
Release the parking brake.

 (b)  
Remove the pressure from hydraulic system 4 (AMM 29-11-00/201).

 (c)  
Pressurize hydraulic system 1 to 3000 psi (AMM 29-11-00/201).
　
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