TM 11-6125-240-12
CHAPTER 3
ORGANIZATIONAL MAINTENANCE INSTRUCTIONS
val is defined as approximately 25 flying hours. The in-
3-1. Tools and Equipment
termediate PMCS on the inverter should be performed
Tools and test equipment required for organizational
concurrently with the Intermediate PMCS scheduled on
the aircraft in which the equipment is installed. Ad-
justments of the maintenance interval must be made to
compensate for any unusual operating conditions.
3-2. Paints and Finishes
Equipment maintained in a standby (ready for im-
When the inverter requires repainting, refinishing, or
mediate operation) condition must have intermediate
touchup painting refer to Federal Standard No. 595A
maintenance performed on it at least once every 30
for a matching color. SB ll-573 1ists the tools and mis-
days. Equipment in limited storage (requires service
cellaneous supplies required for painting.
before operation) does not require intermediate mainte-
nance.
3-3. Touchup Painting instructions
a. Refer to TB 43-0108 for instructions on painting
once each periodic interval (approx 200 flying hours) in
and preserving Electronics Command equipment. In
addition to the intermediate PMCS in table 3-1.
touchup painting a perfect match with the exact shade
Periodic preventive maintenance will be scheduled in
of the original paint may not be possible. The preven-
accordance with the requirements of TM 38-750. The
tion of corrosion and deterioration is the most impor-
periodic preventive maintenance inspection should be
tant consideration in touchup painting; appearance is
shceduled concurrently with the periodic maintenance
secondary. This should not be construed to mean that
service schedule of the aircraft in which the inverter is
the appearance of the equipment is unimportant.
installed to reduce out-of-service time. Refer to the ap-
Touchup painting should be accomplished neatly, and
plicable aircraft technical manual for the hours be-
in a good workmanlike manner. Inspection personnel in
tween service periods.
the field will make allowance for slight color mismatch
Table 3-1. Intermediate PMCS
where minor touchup has been done, but not for neglect
Total time required: 0.3
or poor workmanship.
Work
Sequence
Item to be Inspected
b. Remove rust and corrosion from metal surfaces by
time
number
(M/H)
Procedure
lightly sanding them with fine sandpaper. Brush two
thin coats of paint on the bare metal to protect it from
1
0.1
EXTERNAL WIRING:
Inspect external wires and cable for dam-
further corrosion.
aged insulation of jacketing.
2
AIR VENTS:
3-4. Lubrication
Check the airflow intake and exhaust vents
There are no lubrication requirements at the organiza-
for obstructions.
tional level.
3
0.1
EXTERIOR SURFACES:
Remove dirt and moisture, and inspect for
3-5. Preventive Maintenance Checks and
rust, corrosion, and chipped paint.
4
MOUNTING:
Services.
Check for cleanliness, stability, and
a. To insure that the PU-545/A is always ready for
loose or missing hardware.
operation, it must be inspected systematically so that
5
0.1
ELECTRICAL CAPS:
When accessible, check the electrical
defects may be discovered before they result in serious
brush caps for seating. Do not remove,
damage or failure. The necessary preventive mainte-
rock, or twist to inspect. Use only a
nance checks and services (PMCS) are listed and
direct pressure to insure that the cap
described in tables 3-1 and 3-2. The item numbers in-
is fully seated.
dicate the sequence of the minimum inspection require-
6
CONNECTIONS:
Check connections at terminal board
ments. Defects discovered during operation of the unit
and ac power connector and see
will be noted for future correction to be made as soon as
that they are clean, intact, and
operation has ceased. Stop operation immediately if a
secure,
deficiency is noted during operation which would
7
OPERATION:
damage the equipment. Record all deficiencies together
During operation be alert for signs of
malfunction such as excessive vibra-
with the corrective action taken in accordance with TM
tion, overheating, or variations in
38-750.
output voltage and frequence. Refer
to the operational check in paragraph
once each intermediate interval. An intermediate inter-
2-6.
3-1
