MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
MT-7-420
9/02
11
vanes for foreign object damage.
6
3-37
Clean compressor with chemical wash solution if operating in a
smoggy area (as required).
7
N/A
Inspect the compressor scroll for cracks or breaks at the anti-ice
valve and customer bleed ports. If cracks or breaks are de-
tected, check engine for possible vibration causes.
8
N/A
Inspect for discharge air tube inserts that are cocked or backing
out of the scroll. If cocked or loose inserts are detected, check
engine for possible vibration causes.
9
3-193
Check anti-icing valve for security, worn parts and proper opera-
tion. Valve need not be removed or disassembled unless a
problem is detected.
10
3-237, 3-238
Inspect compressor mount inserts for looseness or oil leakage.
Replace if loose and check engine for possible vibration causes.
11
3-221
Inspect the turbine support assemblies and engine exhaust
ducts for condition of welded joints, for cracks and buckling.
Check exhaust duct clamps for proper installation, condition and
torque.
12
3-235
Wet spline starter-generator gearshafts (new production or
those replaced in accordance with the Allison Commercial En-
gine Bulletin (250-B17TP CEB-1056) do not need periodic in-
spection and lubrication. Clean and inspect any other starter-
generator gearshaft. Clean the female splines of the starter-
generator with mineral spirits and a soft brush. Inspect splines
in accordance with Para 3-236, Starter-Generator Gearshaft
Female Spline Inspection.
Lubricate acceptable splines with grease (Aeroshell No.22, or
equivalent). Before reinstallation of the starter-generator, make
sure torsional damper members of the starter-generator drive-
shaft are in hard contact with each other.
NOTE Inspect the starter-generator brushes for wear in accor-
dance with the Aircraft Manual at the same time the spline in-
spection is made.
13
Item 5, Table III-10 Inspect and clean the turbine pressure oil system check valve.
14
Item 4, Table III-10 Inspect and clean pressure oil tube screen assembly.
15
3-178
Measure oil flow from the scavenge passage or external sump
of the power turbine support.
16
Item 7, Table III-10 Inspect, clean and check magnetic drain plugs.
