TCH.1C-27J-2-29JG
2-5.1
Carry out sampling procedure as follows: (Cont'd)
G.Annul the hydraulic pressure in the No. 1 (No. 2)
Hydraulic System.
H.Close the reservoir drain cock reservoir and
restore the lockwire.
I.Check the hydraulic fluid quantity throughout the
reservoir visual fluid level quantity indicator and,if
necessary replenish.
J.Close the access panel 414J (424J) and 414D
(424D) located in the LH (RH) nacelle.
K.Disconnect the external electrical supply from the
aircraft.
The aircraft system hydraulic fluid shall meet the criteria as
specified in Table 1-1 (NAS 1638):
-Class 7 for a new aircraft
-Class 8 for an aircraft under normal operating
conditions
-Class 9 represents the maximum contamination limit
allowed. If this limit is exceeded, it will benecessary,
with proper flushings, to have the fluid in same
condition as for class 7.
Table 2-4. Hydraulic system max contamination limits
(on 100 sample size)
PARTICLE SIZE
RANGER (microns)
CLASSES
7
8
9
From 5 to 15
32000
64000
128000
From 15 to 25
5700
11400
22800
From 25 to 50
1012
2025
4050
From 50 to 100
180
360
720
Above 100
32
64
128
29-10-00
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