MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
MT-7-420
9/02
13
27
3-105
Purge air from the filter bowl area of the single element pump.
28
3-108
Inspect and clean the fuel nozzle.
29
Item 8, Table III-10
Inspect and clean the No. 1 bearing oil pressure reducer.
30
Item 11, Table III-10
Visually inspect external sump. Clean internal carbonaceous
deposits from sump.
31
3-166 Item 10,
Table III-10
Inspect the power turbine support scavenge strut. Clean inter-
nal carbonaceous deposits from sump.
Other Scheduled Inspections
Interval
Reference
Inspection/Maintenance Action
500 HR
/1 YR
250-B 17
CSL-1030
Inspect uncoated and coated power turbine outer coupling nuts for
corrosion. Compliance with bulletins removes this requirement.
500 HR
3-120
Check the fuel pump driveshaft on Sundstrand single element
pumps for spline wear. NOTE: This inspection not required on
TRW pumps.
600 HR
3-89
Make an installation rotating balance of the engine and propeller at
intervals not to exceed 600 hours.
1500 HR
3-128
Replace fuel control strainer assembly.
1750 HR
3-83
Inspect the compressor case. Inspection frequency shall be made
as necessary by operating environment. In erosive environment,
inspect case at least every 300 hours. In any environment, do not
exceed 1750 hours without case inspection.
1750 HR
3-212A
Inspect the compressor splined adapter internal splines and the
spur adapter gearshaft splines (forward and aft) for wear.
Engine Oil System Scheduled Maintenance
(Table III-10 from Allison Operations & Maintenance Manual)
No. Item
Action
Time Period
Notes
1
Engine
lube oil
Change oil
200 hr max, or
six months, whi-
chever comes
first
Follow procedures in Oil
Change, para 3-163. (Refer
to Approved Oils, para 1-74.)
