C.
AIRPLANES WITH HOLLINGSEAD EXTRACTOR; Remove the E/E Box
S 864-041
(1)
Open the applicable circuit breakers to remove electrical power.
S 034-042
(2)
Remove the connections from the front of the E/E box, if applicable.
S 914-043
CAUTION: DO NOT TOUCH THE E/E BOXES BEFORE YOU SO THE PROCEDURE FOR
_______ DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE (AMM 20-41-02/201). 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).
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A 747-400 MAINTENANCE MANUAL
(4) S 864-044Turn the knob on the front hold-down extractor counterclockwise until you can see the red band.
(5) S 864-045Turn the latch counterclockwise to disengage the front hold-down extractor from the T-hook. Lower the front hold-down extractor to be clear of the T-hook.
NOTE:____ Apply light pressure down on the E/E box handle while you disconnect the front hold-down extractor.
(6) S 024-046Carefully move the E/E box out from tray and remove the E/E box.
NOTE:____ Shake the front of the E/E box from right to left for approximately 1/8 inch to help disconnect the E/E box from the electrical connector.
(7) S 434-047Install the dust cap on the E/E box electrical connector and the tray electrical connector.
(8) S 034-048Remove and discard the O-rings from the electrical connectors on the rack, if installed.
(9) S 034-094AIRPLANES WITH LEVER LATCH HANDLES; Do these steps: (a) Depress the lever latch allowing the lever to move away from the handle. (b) Move the lever in an opening direction forcing the unit away from the shelf-mounted connector.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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A
747-400 MAINTENANCE MANUAL
(c) Remove the unit from the shelf.
TASK 20-11-22-404-049
3. Install the E/E Box___________________
A. References
(1)
AMM 20-41-02/201, Electro-Static Sensitive Devices
B.
AIRPLANES WITH TRIDAIR EXTRACTOR;
Install the E/E Box
S 214-050
(1)
Make sure the rubber plugs are installed in the metering tray at the correct locations. Compare the orifice configuration on the metering tray with the one shown on the decal.
S 344-051
(2)
Remove the dust caps from the electrical connectors.
S 214-052
(3)
Make sure the tray gasket and restrictor plugs (variable number) are in the correct positions. Install if necessary.
S 214-053
(4)
Visually make sure the guide pins on the tray will connect with the E/E box.
S 214-054
CAUTION: MAKE SURE THE ELECTRICAL PINS ON THE E/E BOX CONNECTOR AND TRAY
_______ CONNECTOR ARE NOT BENT OR DAMAGED. INSTALLATION OF THE E/E BOX WITH DAMAGED PINS CAN CAUSE DAMAGE TO THE E/E BOX, THE TRAY ELECTRICAL CONNECTOR, OR THE SYSTEM COMPONENTS.
(5) Visually make sure the electrical pins of the E/E box and tray connector are not bent or damaged. Replace damaged components.
S 914-055
CAUTION: DO NOT TOUCH THE E/E BOXES BEFORE YOU DO THE PROCEDURE FOR
_______ DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE (AMM 20-41-02/201). SOME E/E BOXES ARE ELECTROSTATIC SENSITIVE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO DEVICES IN THE E/E BOX.
(6) Do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-02/201).
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