the callout number used to reference the item in the
amp
ampere
illustration.
assy
assembly
cfm
cubic feet per minute
4. Special Information
dc
direct current
a. Parts which require manufacture or assembly at
dia
diameter
a category higher than that authorized for installation will
ea
each
indicate in the source column the higher category.
ft
foot/feet
b. Action change codes indicated in the left-hand
hd
head
margin of the listing page denote the following:
id
inside diameter
N - Indicates an added item not included in
in
inch
previous publications.
Ig
long/length
C - Indicates a change in data.
max
maximum
F- Indicates a change in FSN only.
NC
American National
c. The following publication pertain to the Filter
Coarse Thread
Unit, Gas Particulate, M7A1:
od
outside diameter
TM 3-4240-201-12, Operator and Organizational
pltd
plated
Maintenance Manual.
stl
steel
unc
unified course thread
5. How to Locate Repair Parts
v
volt
a. When Federal stock number or reference
wd
wide/width
number is unknown:
yd
yard
(1) First.
Using the table of contents,
determine the functional group within which the repair
7. Federal Supply Code for Manufacturers
part belongs. This is necessary since illustrations are
Code
Manufacturer
prepared for functional groups and listings are divided
76545
Mueller Electric Co.
into the same groups.
1583 East 31 Street
(2) Second. Find the illustration covering the
Cleveland, Ohio 44114
functional group to which the repair part belongs.
80205
National Aerospace Standards
(3) Third.
Identify the repair part on the
Committee
illustration and note the illustration figure and item
Aeronautical Industries
number of the repair part.
Association of America
(4) Fourth. Using the repair parts listing, find
81348
Federal Specifications
the functional group to which the repair part belongs and
81349
Military Specifications
locate the illustration figure and item number noted on
81361
Edgewood Arsenal
the illustration.
Edgewood Arsenal,
b. When Federal stock number or reference
Maryland 21010
number is known:
81895
Perfecting Service Co.
(1) First. Using the Index of Federal Stock
Breco Div.
Numbers and Reference Numbers, find the pertinent
332 Atando Street
Federal stock number or reference number. This Index
Charlotte, N. C. 28205
is in ascending FSN sequence followed by a list of
83315
Hubbel Corp.
reference numbers in ascending alpha-numeric
407 E. Hawley Street
sequence, cross-referenced to the illustration figure
Mundelein, Illinois 60060
number and item number.
95138
Perfecting Service Co.
(2) Second. Using the repair part listing, find
P. O. Box 1949
the functional group of the repair part and the illustration
Charlotte, North Carolina 28201
figure number and item number referenced in the index
96906
Military Standards
of Federal stock numbers and reference numbers.
6. Abbreviations
8. Recommendations
for
Maintenance
Manual
Abbreviation
Explanation
Improvements
ac
alternating current
al
aluminum
The
reporting
of
errors,
omissions,
and
aly
alloy
recommendations for improving this manual by
4
