MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
MX-7-420
14
Rev. A
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 Noz-
zle, 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 sca-
venge 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 deposits.
When neces-
sary, as di-
rected by the
oil flow mea-
surement
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. sca-
venge passage or 75 cc
from the G.P. scavenge
passage, follow procedures
in Gas Producer and Power
Turbine Pressure Oil Mani-
fold, para 3-165 and inspec-
tion and Cleaning of Power
Turbine Support Scavenge
Oil Strut, para 3.166.
10
Power tur-
bine support
scavenge
oil strut
Inspect and clean inter-
nal carbonaceous depo-
sits.
300 hr max.
Follow procedures in Inspec-
tion and Cleaning of Power
Turbine Support Scavenge
Oil Strut, para 3-166.
