(2)
SSM 30-71-01
HEATER GASKET BOLTS MOUNTING
SEE A A A
HEATER WIRES
GASKET HEATER Figure 401 Waste Tank Drain Fitting Gasket Heater Installation AA-A WASTE TANK DRAIN FITTING
D21722
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30-71-05
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(3)
SWPM 20-30-12
(4)
WDM 30-71-14
B. Access
(1)
Location Zone 124 Area Below Forward Cargo Container Compartment, Right
(2)
Access Panel
125A Service Panel, Toilet Drain
C. Procedure
S 614-002
(1)
Make sure that the waste tanks and the waste drain are clean and empty.
S 864-025
(2)
Open this circuit breaker on the P414, Left Power Distribution Center, and install a DO-NOT-CLOSE tag:
(a) 414M35, WASTE AND WATER LINE HTR - FWD
S 014-026
(3)
Remove the floor panel at STA 590, RBL 13 in the forward cargo compartment to get access to the area above the waste tank service panel.
S 034-005
(4)
Remove the clamp which attaches the drain cap assembly to the waste tank drain tube.
S 014-024
(5)
Open the lavatory service panel door, 125A.
S 014-007
(6)
Release the waste tank drain cap to get access to all mounting bolts.
S 024-008
(7)
Remove the gasket heater:
(a)
Remove the 8 mounting bolts.
(b)
Remove the waste tank drain cap assembly.
(c)
Cut the electrical lead wires at the heating gasket (SWPM 20-30-12).
NOTE:____Let the cut electrical leads stay where they are. This will help you to find the splice. Remove them when you make a splice with the new leads.
(d)
Remove the heating gasket.
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ALL ú ú 05 Page 402 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
TASK 30-71-05-404-009
3. Waste Tank Drain Gasket Heater Installation (Fig. 401)___________________________________________
A. Consumable Materials
(1)
A00247, Sealant - BMS 5-95
(2)
B00148, Solvent - Methyl Ethyl Ketone (MEK), TT-M-261
B. References
(1)
AMM 24-22-00/201 Manual Control
(2)
AIPC 38-32-00, Fig. 1
(3)
SSM 30-71-01
(4)
SWPM 20-30-12
(5)
WDM 30-71-14
C. Access
(1)
Location Zone 124 Area Below Forward Cargo Container Compartment, Right
(2)
Access Panel
125A Service Panel, Toilet Drain
D. Installation Procedure
S 424-010
(1) Put the heating gasket in position and make sure that no part of the lead wires stay out.
S 114-023
WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIALS SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
(2)
Clean the mounting bolts with solvent, Series 82 (AMM 20-30-82/201).
S 624-012
(3)
Put the bolts momentarily in sealant immediately before installation.
S 424-013
(4)
Install the drain cap assembly and heating gasket with the mounting bolts.
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