TM 55-2840-251-23
SECTION VIII GENERAL MAINTENANCE PROCEDURES (Continued)
1-78 INSPECTION (Cont)
2. Measuring Devices (Cont) diameters. If the gage
enters at any point, the part is worn beyond the
allowable limit.
Whenever
rotor
components,
such
as
turbine
assemblies, are returned to an overhaul facility for
inspection and/or repair, a record of total operating
hours or flight cycle (as applicable) must be included to
enable an overhaul facility to determine service life of
assembly.
3. Oil Filter Fiber Type Element.
CAUTION
No cleaning is permitted on this type
of element.
NOTE
Elements are to be inspected every
100 hours and replaced every 300
hours.
a.
Check that seal is properly seated in lower end
of filter.
b.
If seal is loose, discard element and install
replacement.
4. Oil Filter Metal Type Element.
NOTE
Elements are to be visually inspected
every 100 hours and replaced every
1200 hours.
a.
If a stepped teflon spacer is installed on inner
face of filter cover, check spacer condition and replace
as necessary.
b.
Inspect for visible metal contamination. If no
contamination is evident, proceed as detailed in steps c
thru f.
c.
Clean element (Paragraph 1-77).
d.
Using a 10 power (minimum) magnifying glass,
inspect filter element for blocked passages and broken
wire mesh.
e.
If dents and /or broken wire mesh are found, the
filter element must be replaced.
f.
If more than. five percent of visible passages
are found blocked after repeated cleaning, element
must be returned to Depot Maintenance for ultrasonic
cleaning and a bubble point test.
g.
If a small amount of visible metal contamination
is evident, proceed as detailed in steps h and i,
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