MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
MT-7-420
9/02
14
2
Engine oil
filter
Inspect and clean filter
element using ultra-
sonic cleaner with
perchloroethylene.
100 hr max.
Follow procedures in Oil Fil-
ter, para 3-168.
3
Engine
lube oil
When changing from
MIL-L-7808 to MIL-L-
23699 or vice versa
As necessary
Refer to Approved Oils, para
1-74.
4
Pressure
oil tube
screen as-
sembly
Inspect and clean
screen using mineral
spirits
100 hr max.
Refer to applicable part of
Cleaning the Power Turbine
Support Pressure Oil Nozzle,
para -3-177.
5
Turbine
pressure
Oil System
Check
Valve
Inspect and clean
100 hr max.
Oil system check valve para
3-170.
6
Oil flow
from P.T.
scavenge
passage or
external
sump and
G.P scav-
enge pas-
sage
Measure oil flow
100 hr max.
Follow procedures in Oil Flow
Measurement, para 3-178.
7
Magnetic
drain plugs
Inspect and clean
100 hr max.
Follow procedures in Mag-
netic Plug, para1-172.
8
No. 1 bear-
ing oil
pressure
Inspect and clean
300 hr max.
Follow procedures in Oil
Change, para 3-163
9
No. 6-7
and No. 8
bearing
pressure
oil nozzle
Inspect, clean internal
carbonaceous depos-
its.
When neces-
sary, as directed
by the oil flow
measurement
Refer to oil flow measure-
ment, para 3-178. If an oil
flow of less than 90 cc is ob-
served from the P.T. scav-
enge passage or 75 cc from
the G.P. scavenge passage,
follow procedures in Gas
Producer and Power Turbine
Pressure Oil Manifold, para
3-165 and inspection and
Cleaning of Power Turbine
Support Scavenge Oil Strut,
para 3.166.
