20-11-21
 ALL  ú ú 01 Page 402 ú Feb 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 424-018
 (4)
Put the O-ring in its position in the groove below the nut hex.

 S 424-008

 (5)  
Turn the fitting into the boss and tighten it to the correct torque for the fitting dimensions (Ref 20-51-01/201).

 S 434-009

 (6)  
Connect the hose or the tube to the fitting.

 TASK 20-11-21-404-010
 4. Recessed Boss Seal Fittings-Elbow (Style S) - Installation (Fig. 401)
_____________________________________________________________
 A. References
 (1)  AMM 20-51-01/201, Standard Torque Values
 B. Procedure
 NOTE: Use a lubricant on the O-ring which is applicable for the O-ring
____
 material.

 S 434-011
 (1)  
Install the jamnut on the threaded end of the fitting and turn it to the stop.

 S 434-012

 (2)  
Lubricate the new NAS1612 O-ring.

 S 424-019

 (3)
Install the O-ring in the groove between the two sets of threads.

 S 434-013

 (4)  
Lubricate the new NAS1611 O-ring and the backup ring.

 S 424-020

 (5)
Install the O-ring and backup ring in the fitting grooves.

 S 424-014

 (6)  
Trun the fitting into the boss until it touches the bottom. Then loosen it until the fitting aligns with the hose or tube (one turn maximum).

 S 434-015

 (7)  
Hold the fitting and tighten the jamnut to the correct torque for the fitting dimesions (AMM 20-51-01/201).

 (8)  
Connect the hose or tube to the fitting.

 S 434-016
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 20-11-21
 ALL  ú ú 01 Page 403 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 E/E RACK MOUNTED COMPONENTS - REMOVAL/INSTALLATION
__________________________________________________
 1.  General
_______
 A.  This procedure contains these tasks.
 (1)  
The first task removes the electrical/electronic (E/E) box from the rack.

 (2)  
The second task installs the E/E box.

 (3)  
Adjust lever latch forks.

 (4)  
The third task removes the circuit card assembly from the rack.

 (5)  
The fourth task installs the circuit card assembly.

 B.  Lever latches are used for movement and retention of black boxes mounted on racks. Adjustment of the lever latch fork is necessary to assure proper connector engagement: If a box has two lever latches, both should be adjusted together.
 C.  Connector engagement for all type boxes must be as shown in Fig. 401.
 TASK 20-11-22-004-033
 2.  Remove the E/E Box (Fig. 401)
__________________
 A.  References
 (1)  AMM 20-41-02/201, Electro-Static Sensitive Devices
 B.  AIRPLANES WITH TRIDAIR EXTRACTOR;
 Remove the E/E Box

 S 864-110
 CAUTION: IMPROPER ADJUSTMENT OF ASSEMBLIES ON EQUIPMENT SHELVES MAY
_______
 CAUSE CIRCUIT MALFUNCTION OR EQUIPMENT DAMAGE.

 (1)  
Open the applicable circuit breakers to remove electrical power.

 S 034-035

 (2)  
Remove the connections from the front of the E/E box, if applicable.

 S 914-036
 CAUTION: DO NOT TOUCH THE E/E BOXES BEFORE YOU DO THE PROCEDURE FOR
_______ DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE (AMM 20-41-01/201). SOME E/E BOXES ARE ELECTROSTATIC SENSITIVE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO DEVICES IN THE E/E BOX.
 (3)  
Do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-02/201).

 S 034-083

 (4)  
Turn the knob on the front hold-down extractor counterclockwise to disengage the clutch.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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