4. Procedure
_________
(Ref. Fig. 301/TASK 12-32-29-991-001) Subtask 12-32-29-170-050
A. Flush the sampling valve. WARNING : OBEY THE MANUFACTURER'S INSTRUCTIONS WHEN YOU USE THE SPECIAL
_______
MATERIAL.
THIS MATERIAL IS DANGEROUS.
(1)
Clean the sampling valve and cap with a lint-free cloth and CLEANING AGENTS (Material No. 11-003).
(2)
Remove and discard the lockwire from the applicable sampling valve:
-
for the Green hydraulic system, sampling valve 1187GM.
-
for the Yellow hydraulic system, sampling valve 3187GM.
-
for the Blue hydraulic system, sampling valve 2187GM.
(3)
Remove the cap from the sampling valve.
(4)
Put the container below the sampling valve.
(5)
Put the notch in the head of the cap below the head of the needle valve.
(6)
Move the cap to pull the needle valve down and drain 0.2 l (0.0528 USgal) into the container.
(7)
Remove the cap from the needle valve.
(8)
Discard the hydraulic fluid (refer to the local regulations). NOTE : You must flush the sampling valve before you remove each
____
sample.
Subtask 12-32-29-281-050
B. Remove a sample from the sampling valve.
(1)
Put the clean glass sample bottle below the sampling valve.
(2)
Put the notch in the head of the cap below the head of the needle valve.
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Sampling Valves - Location and Operation Figure 301/TASK 12-32-29-991-001- 12 (SHEET 1)
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Sampling Valves - Location and Operation Figure 301/TASK 12-32-29-991-001- 22 (SHEET 2)
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(3)
Move the cap to pull the needle valve down and drain 0.2 l (0.0528 USgal) into the glass sample bottle.
(4)
Remove the cap from the needle valve.
(5)
Seal the glass sample bottle.
(6)
Put a tag on the glass sample bottle with the aircraft registration, the system identification, the date and time.
(7)
Send the sample bottle to the analysis laboratory.
Subtask 12-32-29-281-052
C. Contamination analysis by Particle Count The maximum particle contamination must be to NAS1638 class 9 or better.
------------------------------------------------------------------------------
NUMBER OF PARTICLES ------------------------------------------------------------------------------Particle size Class 9 ------------------------------------------------------------------------------5 to 15 micron 128000 15 to 25 micron 22800 25 to 50 micron 4050 50 to 100 micron 720 > 100 micron 128
(1) If the contamination rate in the fluid sample is higher to one or more of the values given in the table above (class 9):
(a)
Stop the hydraulic tests.
(b)
Clean the hydraulic fluid (Ref. TASK 12-36-29-615-001), (Ref. TASK 12-36-29-615-002) and (Ref. TASK 12-36-29-615-003), - or reclaim it with the hydraulic ground power cart (Ref. TASK
12-36-29-600-004), (Ref. TASK 12-36-29-600-005) and (Ref. TASK 12-36-29-600-006). - or change it (Ref. TASK 12-36-29-600-001), (Ref. TASK 12-36-29-600-002) and (Ref. TASK 12-36-29-600-003).
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Subtask 12-32-29-281-053
D. Chemical analysis Chemical analysis must be to NSA307-110. Limit Characteristics of fluid in operation. The values below are the maximum permissible limits for in-service fluid.
-acid number:1.5mg KOH/g max.
-density at 23 +/- 3 deg.C: 970 to 1066 kg/m3.
-water content 0.50% max.
NOTE : The maximum water contents permitted by the manufacturer in
____ hydraulic fluids is 0.80%. But this limit together with very high temperature decreases the life of the hydraulic fluids. Airbus Industrie thus recommends to decrease the limit to 0.50% which will increase the life of the hydraulic fluid.
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