CAUTION:_______DO NOT HIT THE INLET PLENUM WITH YOUR HANDS OR TOOLS. THIS CAN CAUSE DAMAGE TO THE INLET PLENUM. IF YOU CAUSE DAMAGE TO THE INLET PLENUM, IT WILL BE NECESSARY TO REPLACE IT.
(4)
Replace the electrical connector:
(a)
Get the applicable assembled connector.
NOTE: The wires must be a minimum of 20 inches (508 mm) long.
____
(b)
Remove the loop clamp that is near the connector.
(c)
Remove the lacing tape from the wire harness if it is necessary.
CAUTION: WHEN YOU REPLACE AN ELECTRICAL CONNECTOR, YOU MUST
_______ CUT AND MAKE A SPLICE ONE WIRE AT A TIME. YOU MUST CUT THE WIRES AT DIFFERENT LENGTHS TO MAKE SURE THE SPLICES WILL NOT BE ADJACENT TO EACH OTHER. IF YOU DO NOT DO THIS, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.
(d)
Cut one wire in the cable.
(e)
Do the procedure to repair the APU wire harness to make a splice with the wire you cut and the new connector.
(f)
Continue to cut wires and make splices until the new electrical connector is installed.
(5) S 418-045Install the lacing tape to the wire harness as necessary.
(6) S 418-046Install the harness clamps you removed.
(7) S 418-047Close the APU access doors: (a) Do a visual check of the EGT bus bars: 1) Make sure the bus bars are not damaged.
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747-400 MAINTENANCE MANUAL
2) Make sure no metal parts touch the bus bars. 3) Make sure the bus bars do not touch each other.
(b)
Disengage the support rods for the APU access doors.
(c)
Put the support rods in the clips on the inner side of the APU access doors.
(d)
Make sure the insulation covers correctly attach to the APU compartment firewall.
(e)
Close the APU access doors.
(f)
Close the latches on the APU access doors.
(g)
Close the latches on the APU access doors.
S 868-048
(8)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P6 Main Power Supply Pannel
1) 6K18 APU ALTN CONT
(b)
P83 Panel, E8 AFT Equipment Center
1) APU PRIMARY CONT
S 868-049
(9) Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 panel.
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747-400 MAINTENANCE MANUAL
APU AIR INLET - DESCRIPTION AND OPERATION
_________________________________________
General
_______
A. The APU air inlet provides for the control and passage of air from the exterior of the airplane to the air inlet plenum. The air inlet is located in the APU compartment directly above the APU. It consists of the air inlet door, the inlet door actuator, the air inlet duct, and the seal for the air inlet duct.
Air Inlet Duct (Fig. 1)
______________
A. The air inlet duct conducts air to the air inlet plenum. The duct is made of fiberglass-honeycomb construction with a cork covering on critical external surfaces for fire retardation. The duct is supported by two braces; one attached to the firewall and the other to the overhead structure. The seal for the air inlet duct is attached to the lower end of the duct.
B. The air inlet duct is located between the skin of the airplane and the air inlet plenum. At the upper end, the duct is fastened to the outer skin of the airplane with rivets and bolts. The duct provides a mounting structure for the inlet door actuator athe inlet door, and the door position switch.
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