26-15-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
B. Consumable Materials
(1) D00368 Grease - Silicone, DC4
C. Parts
~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Screw | 26-15-02| 02 | 05 | | | 3 | Nut | | | 15 | | | 4 | Screw | | | 105 | | | 6 | Nut | | | 120 | | | 9 | Washer | | | 110 | | | 10 | Detector Assembly - Upper | | | 195 | | | 14 | Nut | | | 230 | | | 15 | Detector Assembly - Lower | | | 245 | | | 17 | Screw | | | 210 | 2......…........…...................................…..........….....….........1
D. Reference
(1)
24-22-00/201, Manual Control
(2)
26-15-00/501, APU Fire Detection
(3)
WDM 26-15-11
(4)
SSM 26-15-01
E. Access
(1)
Location Zone
317 APU Compartment L.H.
318 APU Compartment R.H.
(2)
Access Panels
317A Door - Access - APU
318A Door - Access - APU
F. Procedure
S 434-021
(1) Fit the new copper gaskets (9) on the electrical connectors DM216 or DM217 (8) of the detector element and install through the hole in end bracket (2).
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747-400 MAINTENANCE MANUAL
S 434-022
(2)
Install the retaining nut (7) on both ends of the detector. S 424-023
CAUTION:_______DO NOT TWIST OR SHARPLY BEND THE DETECTOR ELEMENT. THIS MAY DAMAGE THE DETECTOR ELEMENT.
(10)
Remove the protective caps from airplane wiring connectors and
connect with the electrical connectors DM216 or DM217 (8).
(3) Position the detector element (13) or (18) along the support tube (14), and make sure the detecotr element is not loose between any two clamps (16).
(4) S 434-024Install the grommet (15) on detector element at the location of the mounting clamps (16).
(5) S 434-025Put the detector element (13) with the grommets (15) in clamps (16).
(6) S 434-026Install the remaining electrical connector DM216 or DM217 (8) through the hole in end bracket (2).
(7) S 434-027Install the retaining nut (7).
(8) S 764-028Make sure the resistance between the electrical connector DM216 or DM217 (8) shell and the primary structure of airplane is not greater than 0.010 ohm.
(9) S 434-029Put the lockwire (19) on the retaining nuts (7).
S 434-030
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 644-031
(11)
Apply a thin film of grease to the copper gasket (10) at the base of the connector.
S 434-032
(12)
Tighten the connectors to 50 to 70 pound-inches.
S 434-033
(13)
Put the lockwire between the airplane wiring connectors and the electrical connectors (8).
S 414-055
(14)
Close APU access doors.
S 864-056
(15)
Close the circuit breakers listed below, and remove DO-NOT-CLOSE identifiers:
(a) P6 Main Power Distribution Panel 1) 6C5 ALTN PWR LOOP A APU FIRE/BLD DUCT OVHT 2) 6C6 FIRE SW UNLOCK 3) 6H14 APU FIRE/BLD DUCT OVHT LOOP A 4) 6H15 APU FIRE/BLD DUCT OVHT LOOP B
S 734-057
(16) Do the operational APU fire detection test (Ref 26-15-00/501).
TASK 26-15-02-004-058
4. Remove APU Fire Detector Assembly (Fig. 401)_________________________________
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