STORAGE AND SPECIAL INSTRUCTIONS
such gland lots are formed and sampled for sur-
veillance, reports of results should include a com-
those sets listed in appendix I.
plete description of the grand lot compositio
each case. If the samples drawn from the grand
7. Preservation, Packaging and Packing. Preser-
lot indicate heterogeneity of the individual lots
vation, packaging and packing will be in accord-
making up the grand lot, the grand lot will
ance with the packaging references cited in the
be terminated and manufacturer's lot sam
Packaging Segment of the Army Master Data
substituted.
File (AR 708-1)
c. Mixed Lot. The mixed lot is formed of one or
more lots whose identification by manufacturer or
MIL-STD-129
lot number has been lost and its relationship to
other lots cannot be determined. An example of
this is depot rollback or repacks of represerved
accordance with SB 740-1.
material. Several mixed lots may be grouped into
grand lots if surveillance inspection data indicates
b Age Control The sets covered by this bulletin
that these mixed lots are similar in their signifi-
will be issued on a First-In-First-Out (FIFO)
cant characteristics.
basis by date of receipt or assembly action.
c Shelf-Life The sets covered by this bulletin
have an indefinite shelf-life.
Select samples of material in a manner that will
assure each unit in the lot has an equal chance of
being selected. Biased methods, such as selecting
tative samples for surveillance evaluation is based
items from the same position in the container,
on the homogeneity of the lot Subject to the lim-
pallets or stacks, taking items all from one loca-
itations of this rule, inspection lots should be as
tion: or selecting items-that appear defective, will
large as possible To encompass these principles,
not be utilized. The use of a table of random num-
the formation of lots for surveillance will consist
bers as contained in the Department of Defense
of manufacturer's lots, grand lots, or mixed lots.
Handbook, H53, is recommended and will insure
a Manufacturer's Lot The manufacturer's lot,
random selection of samples.
batch, or control number will be used whenever
b Inspection.
possible in the selection of samples This would
include lots of sizeable quantities in original
(1) Frequency.
packs
(a) Controlled humidity warehouse--60
months.
b. Grand Lot
(b) Controlled temperature warehouse--
(1) The grouping together of several lots
30 months.
of one manufacturer can effect an increase of lot
(c) Noncontrolled temperature ware-
size However, the following conditions must be
house--24 months.
met by these lots before material can be consid-
(d) Shed-12 months.
ered for grouping into a grand lot:
(e) Open- 6 months.
(a) Identical stock number, class, type,
( 2 ) S t o r a g e q u a l i t y l e v e l s ( S Q L s ) . The
model
storage quality level is 4 0, and will pertain to
(b) Same manufacturer.
those characteristics cited in the defect code col-
(c) Manufactured within a period of
umn of appendix HI
Cd) Comparable storage history.
(3) Sampling plan. The sampling plan indi-
(e) Identical packaging
cates the number of units from each lot which are
(f) No know
significant difference in
to be Inspected and the criteria for determining
the acceptability of the lot (defective acceptance
and rejection numbers)
ot may be formed when the
(a) Sample size. The sample size will be
all available data. in
ned from table 1, which is based on MIL-
the conditions noted above and the t
judgement of the surveillance team, indicate the
homogeneity of all significant characteristics.
Acceptance and rejection numbers
The formation of a grand lot at a depot is only
e sample size from table 1 and
ction and does
re-
acceptance number and rejec-
or reworking of
ere
tion number are given in table 2.
