(a)
Attach the links to the APU lugs with the bolts, the washers, and the nuts. 1) Tighten the nuts with your fingers.
(b)
Attach the support block for the cone bolt to the links with the bolts, the washers, and the nuts. 1) Tighten the nuts to 65-75 pound-inches (7.4-8.5 N.m).
(c)
Tighten the nuts that attach the links to the APU lugs to 65-75 pound-inches (7.4-8.5 N.m).
(d)
Attach the shockmount to the beam with the bolt, the washers, and the nuts. 1) Tighten the nuts to 50-70 pound-inches (5.7-7.9 N.m).
(e)
Attach the vertical support tube to the shockmount with the bushings, the bolts, the washers, and the nuts. 1) Tighten the nuts to 50-70 pound-inches (5.7-7.9 N.m).
(f)
If you loosened the bolt which attaches the support tube to the structure, then tighten the bolt.
S 416-010
(6)
Install the APU (Ref 49-11-01/401).
S 416-009
(7)
Close the APU access doors:
(a)
Do a visual check of the EGT bus bars:
1) Make sure the bus bars are not damaged.
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.
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49-13-08
ALL ú ú 04 Page 607 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
APU HARNESS - REMOVAL/INSTALLATION
__________________________________
1. General_______
A. This procedure contains the tasks to remove and install the electrical wire harnesses for the APU. This procedure is in two sections. One section is for the front wire harness on the forward side of the air inlet plenum. The other section is for the rear wire harness on the aft side of the air inlet plenum.
B. There are four tasks in this procedure. There are removal and installation tasks for an APU with a wire harness jumper (PRE-PWC-SB 16142). There are removal and installation tasks for an APU without a wire harness jumper (POST-PWC-SB 16142). POST-PWC-SB 16202 changes the straight P6 connector with a 90 degree angle connector.
C. The wire harnesses are installed around the APU engine. You can get access to the wire harnesses through the APU access doors.
D. Table I shows the APU electrical connectors, their mating components, and the approximate location of the component. Use this table as an aid for the installation instructions to connect the electrical connectors. ~................................................................... | TABLE I | ..................................................................... | Electrical | Mating | | | Connector | Component | Approximate Location | ..................................................................... | í P3 | Fuel Pump | Aft Side of the Accessory Gearbox | | í P4 | Fuel Metering | Aft Side of the Accessory Gearbox, | | | Unit | Aft Side of the Fuel Pump | | í P5 | Main Oil Temp.| Aft Side of the Oil Filter Housing | | | Sensor | | | í P6 | Ignition | Lower Right Side of the Inlet Plenum | | | Exciter | | | í P7 | J7 Harness | Lower Aft Right Side of the Inlet | | | Connector | Plenum (On the Fuel Pump), (APU | | | | with a Wire Harness Jumper, PRE-PWC | | | | -SB 16142) | | í P7 | Low Oil Press.| Lower Aft Right Side of the Inlet | | | Switch | Plenum (APU without a Wire Harness | | | | Jumper, POST-PWC-SB 16142) | | í P7A | Low Oil Press.| Lower Aft Right Side Of the Inlet | | | Switch | Plenum (APU with a Wire Harness | | | | Jumper, PRE-PWC-SB 16142) | | í P9 | P1 Pressure | Lower Aft Left Side of the Inlet | | | Sensor | Plenum | | í P10 | T1 Air Temp. | Upper Aft Side of the Inlet Plenum | | | Sensor | | | í P11 | T6 Trim Unit | Lower Aft Left Side of the Inlet | | | | Plenum |
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