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 (6)  S 493-011Put a bucket below the airplane, aligned with the drain mast to contain the water that will come out.
 (7)  S 163-012Remove the blockage from the drain lines: (a) Fill the drain lines with an alkaline detergent: 1) Put the detergent down the drain line. 2) Let the detergent soak for one hour. 3) Install the sink drain plug. 4) Fill the sink with water. 5) Make sure that the water flows out of the (sink overflow) drain line. 6) Remove the sink drain plug. 7) Make sure that the sink drains correctly. (b) If the detergent did not remove the blockage from the drain lines: 1) Apply water below the drain line strainer with a maximum pressure of 25 psi.

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747-400 MAINTENANCE MANUAL
 (c)  If these procedures did not remove the blockage from the drain lines, refer to 38-31-00/201.
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747-400 MAINTENANCE MANUAL
 SERVICING (SCHEDULED) - DESCRIPTION AND OPERATION
_________________________________________________
 1.  General_______
 A.  Scheduled airplane servicing consists of periodic bearing and bushing lubrication, oil change of certain components, cleaning or replacement of filters, and airplane cleaning and washing.
 2.  Lubrication___________
 A.  Information, regarding airplane lubrication, such as item to be lubricated, lubricant to be used and method of application, is provided in Section 12-21-00.
 3.  Oil Change__________
 A.  Instructions, for draining and refilling those components requiring oil changes periodically, are provided in Section 12-22-00.
 4.  Filters_______
 A.  A list, to identify and locate filters you can replace and clean, is provided in Section 12-23-00.
 5.  Cleaning and Washing____________________
 A.  Instructions regarding airplane exterior cleaning, the chemicals to use and procedures to follow, are provided in 12-25-01.
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747-400 MAINTENANCE MANUAL
 SERVICING (LUBRICATION) - DESCRIPTION AND OPERATION
___________________________________________________
 1.  General_______
 A. Lubrication (Fig. 1)
 CAUTION: ONLY BEARINGS AND BUSHINGS PROVIDED WITH LUBRICATION FITTING
_______ SHOULD BE LUBRICATED, SINCE LUBRICATION OF BEARINGS AND BUSHINGS CONTAINING TEFLON WILL CAUSE DETERIORATION OF THE TEFLON AND REDUCE BEARING LIFE.
 (1)  
Certain bearings and bushings used throughout the airplane have teflon bearing surfaces and do not require additional lubrication.

 (2)  
Information regarding airplane lubrication, such as item to be lubricated, lubricant to be used and method of application are provided in the following lubrication subjects of this section.

FILL TO LEVEL PAINT BRUSH OF FILLER PORT GREASE GUN HAND GREASE GUN OIL CAN

FILL 
MIL-H-5606  

BMS 3-33
ZERK 
BMS 3-33  

FLUSH 
BMS 3-33 

MIL-L-7870

 

LUBRICATION REQUIREMENTS NOT
IN CHAP 12  1  FOR LUBRICATION REQUIREMENT, 
REFER TO APPLICABLE CHAPTER 
1 

APPLICATION METHOD OF 
TYPE OF LUBRICANT 

(SAMPLE SYMBOLS)

Lubrication Symbols
Figure 1

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