S 435-148
(15)
Connect the electrical connectors DM216A, DM216B, DM216C, and DM216D to the APU detector M216, and torque the connector to 50 to 70 pound-inches.
S 435-164
(16)
Install the lockwires on both sides ends of the detector per BAC 5018 double twist method.
S 865-129
(17)
Repeat the procedure for the APU detector M217.
S 865-214
(18)
Close these circuit breakers:
(a) P6, Main Power distribution Panel
1) 6C5, ALTN PWR LOOP A APU FIRE/BLD DUCT OVHT
2) 6H14, APU FIRE/BLD DUCT OVHT LOOP A
3) 6H15, APU FIRE/BLD DUCT OVHT LOOP B
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A
747-400 MAINTENANCE MANUAL
H. Return to Normal
S 865-055
(1) Set both of the following switches to "NORM":
(a)
S2089 Ground Test Enable Switch (P461)
(b)
S2090 Remote Test Enable Switch (RCDU).
S 865-019
(2) Close these circuit breakers and remove the DO-NOT-CLOSE
identifiers:
(a) P6, Main Power Distribution Panel
1) 6C6, FIRE SW UNLOCK
2) 6H1, FIRE EXTINGUSHER ENG 1&3 B
3) 6H2, FIRE EXTINGUISHER ENG 1&3 A
4) 6H3, FIRE EXTINGUISHER ENG 2&4 B
5) 6H4, FIRE EXTINGUISHER ENG 2&4 A
6) 6H5, FIRE EXTINGUISHER APU
S 415-205
(3)
Close the APU access doors:
(a)
Do a visual check of the APU 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.
I.
Test the functions of the APU fire handle.
S 915-220
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1)
Do the Installation of the Door Locks on the Wing Landing Gear task (AMM 32-00-30/201).
S 495-125
(2)
Do the Installation of the Door Locks on the Body Landing Gear task (AMM 32-00-30/201).
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A 747-400 MAINTENANCE MANUAL
S 865-126
(3) Make sure these circuit breakers are closed: (a) P6, Main Power Distribution Panel 1) 6G5, APU FUEL S/O VALVE (b) P83 panel, E8 Aft Equipment Center 1) APU PRIMARY CONT 2) APU START
S 865-127
(4) Open these circuit breakers and attach DO-NOT-CLOSE identifiers: (a) P6, Main Power Distribution Panel (b) P180, DC Power Distribution Panel 1) 180H4, FUEL BOOST PMP CONT AFT 2 & FWD 3 (c) P414, Main Power Distribution Panel 1) 414R18, FUEL BOOST PUMP MAIN 2 AFT
S 865-128
(5) Set the switches: (a) Set the BATTERY switch on the P5 panel to the ON position. (b) Set the STANDBY POWER switch on the P5 panel to the AUTO position. (c) Make sure the GND TESTS switch on the P461 maintenance panel is set to the NORM position. (d) Push the two APU GEN FIELD MAN RESET switches on the P461 panel. 1) Make sure the FIELD OFF light in each APU GEN FIELD MAN RESET switch is off.
(e) Set the APU control switch, on P5 pilots overhead panel, to the ON position. 1) Make sure the APU fuel shutoff valve, on No. 2 main fuel tank rear spar, is open (Fig. 502).
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