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 HYDRAULIC FLUID - INSPECTION/CHECK
__________________________________
 1.  General_______
 A.  This procedure contains the task to get fluid samples from the hydraulic system. You can use these samples to find out the condition of the hydraulic fluid.
 B.  The operational environment of the airplane hydraulic system can affect the service life of the hydraulic fluid. You make a decision to take a sample of the hydraulic fluid for analysis if you find that it is necessary from your service experience. Make sure that the fluid analysis results agree with the fluid specification limits shown on table
 601. If the fluid properties are greater than the limits in table 601, replace some quantity of fluid with new fluid until the fluid properties agree with the limits shown . You make a decision on the quantity of fluid to be replaced.
 TASK 29-00-00-206-001
 2.  Get a Hydraulic Fluid Sample____________________________
 A.  General
 (1)  
This is the recommended task to get a hydraulic fluid sample. It is necessary to use bottles cleaned with the steps in this task, or you cannot use the samples

 (2)  
It is necessary to get two fluid samples from each test source set. Get one sample in a 1 pint polyethylene bottle and the other sample in a 2 ounce glass bottle.

 B.  
Standard Tools and Equipment

 (1)  
Filter - 47mm disc (4 micron absolute), Gelman Type GA-6, P/N 60173 , Gelman Sciences, 600 S. Wagner Road, Ann Arbor, Mi., 48106

 (2)  
Filter - 25mm, Type SMWP 5 uM, Catalog No. SMWP 025 00, Millipore Corp., 80 Ashby Road, Bedford Mass. 01730

 (3)  
Bottle - Polyethylene, with polyethylene sealed screw cap (1-pint capacity)

 (4)  
Bottle - Glass, with a polyethylene sealed screw cap (1- or 2-ounce capacity)

 (5)  
Bags - Polyethylene, clean (for storing bottles)

 (6)  
Container - 1 U.S. Gallon (4 Liter) capacity, for hydraulic fluid

 C.  
Consumable Materials

 (1)  
B00309 Alcohol - Isopropyl (approximately 1 pint)

 (2)  
B00448 Trichloroethane

 (3)  
G00170 Solution - Nitric Acid, To Clean Bottles

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

OUTBOARD HYDRAULIC RESERVOIRSEE A SIGHT GLASS
FWD
SIGHT GLASS
SAMPLE VALVE
FWD
INBOARD HYDRAULIC TRANSMITTER FOR
DRAIN
RESERVOIR THE HYDRAULIC
VALVE
FLUID QUANTITY
OUTBOARD HYDRAULIC RESERVOIR A
VIEW PORT FOR THE SIGHT GLASS
SIGHT
GLASS

SAMPLE VALVE
TRANSMITTER FOR FWDDRAIN THE HYDRAULIC
VALVE
FLUID QUANTITY
INBOARD HYDRAULIC RESERVOIR
A
Main Hydraulic Reservoir Location Figure 601
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

FLUID PROPERTIES  IN-SERVICE FLUID LIMITS  TEST METHOD 
APPEARANCE  NO CLOUDINESS, PHASE SEPARATION OR PRECIPITATION. ANY COLOR ACCEPTABLE  VISUAL 
25`C/25`C SPECIFIC GRAVITY  0.970-1.066  ASTM D941 
BY WT WATER CONTENT PERCENT  0.8 MAXIMUM  ASTM D1744 OR INFRARED 
NEUTRALIZATION NO. MG KOH/GM  1.5 MAXIMUM  ASTM D974 
VISCOSITY, CS AT 100`F  6.0 TO 12.5  ASTM D445 
ORGANIC CONTAMINATION  NONE DETECTABLE BY INFRARED  1INFRARED 
2 POTASSIUM SULFUR CHLORINE SODIUM CALCIUM ELEMENTAL CONTAMINATION  500 PPM MAXIMUM 200 PPM MAXIMUM 50 PPM MAXIMUM 50 PPM MAXIMUM 50 PPM MAXIMUM  3|10 PPM |4 PPM |20 PPM |3 PPM |2 PPM ACCURACY ANY METHOD WITH FOLLOWING 
OVER 100 5 TO 15 PARTICLE SIZE RANGE 50 TO 100 25 TO 50 15 TO 25 PARTICULATE (MICRONS) CONTAMINATION  4,050 22,800 4 128 NAS 1638, CLASS 9 128,000 MAXIMUM NUMBER OF PARTICLE PERMITTED 720  SAE ARP 598 
　
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