(6)  
Remove electrical power (AMM 24-22-00/201).

 (7)
Reinstall the floor panel, sidewall panel, or cargo liner.

 S 864-012
 S 714-013
 S 864-014
 S 414-015
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747-400 MAINTENANCE MANUAL
 WASTE TANK RINSE FITTING HEATERS - REMOVAL/INSTALLATION
_______________________________________________________
 1.  General
_______
 A.  There are heaters at the waste tank rinse fittings which prevent ice inside the lines. The heaters are located on the rinse line tubing nuts, inside the fuselage at the waste service panel.
 B.  This subject has two tasks, one for the removal and one for the installation of the rinse fitting heater. In this procedure, you will get access to the heater, cut the electrical leads, remove the heater, and install a replacement unit. The procedure is the same for each of the four heaters.
 TASK 30-71-03-004-001
 2.  Waste Tank Rinse Fitting Heater Removal (Fig. 401)
_______________________________________
 A.  References
 (1)  
SSM 30-71-01

 (2)  
SWPM 20-30-12

 (3)  
WDM 30-71-12

 B.  Access
 (1)  Location Zone
 147, 148  Area below Bulk Cargo Compartment - Waste Tank Service Panel
 C.  Procedure
 S 864-002
 (1)  Open this circuit breaker:
 (a)  P414, Left Power Distribution Center
 1)  414D005, WASTE & WATER HTRS-A1 414A024, WASTE & WATER HTRS-B1
 S 014-025
 (2)  
Remove the bulk cargo compartment floor panel at STA 593, RBL 9 to get access to the waste tank service panel from above.

 S 034-004

 (3)  
Cut the electrical leads near the rinse fitting heater (SWPM 20-30-12).

 NOTE: You can let the electrical leads stay until you install the
____ the replacement heater. This will make it easier for you to find the wires.
 S 034-005
 (4)  Remove the thermostat from the surface of the pan.
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747-400
MAINTENANCE MANUAL

RINSE FITTING HEATER
A
SEE A
A
RINSE
FITTING
HEATER
WASTE TANK SERVICE PANEL
A THERMOSTAT
TWO WRAPS OF FLAME-RESISTANT ADHESIVE TAPE
RINSE FITTING  WASTE TANK 
DRAIN FITTING 
A-A

NOTE: HEATERS AT THE WASTE TANK SERVICE PANEL.
____THERE ARE 4 RINSE FITTING
Waste Tank Rinse Fitting Heaters Installation Figure 401
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747-400 MAINTENANCE MANUAL
 S 034-006
 (5)  
Remove the tie-down strap to move the electrical leads away from the rinse line.

 S 034-007

 (6)  
Remove the adhesive tape from the rinse fitting heater.

 S 024-008

 (7)  
Remove the rinse fitting heater.

 TASK 30-71-03-404-009
 3. Waste Tank Rinse Fitting Heater Installation (Fig. 401)
____________________________________________
 A. Consumable Materials
 (1)  
A00028, Adhesive BAC 5010 Type 70

 (2)  
B00148, Solvent - Methyl Ethyl Ketone (MEK), TT-M-261

 (3)  
G00000, Strap, Tie-Down

 (4)  
G00134, Tape - Adhesive, Flame Resistant - 1.5-inch wide

 B. References
　
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本文鏈接地址：747-400 AMM 飛機維護手冊 防冰和排雨 ICE AND RAIN PROTECTION(88)