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|  MIL-F-45557B
4.5.3.3 Endurance testing.
4.5.3.3.1 Lot size. The initial endurance test lot size shall
consist of the initial production; subsequent endurance test lot
sizes shall consist of 100 feeders.
4.5.3.3.2 Procedure. One feeder shall be selected from each
endurance lot and shall be tested for endurance (see 3.3.2) using the
test methods specified in 4.6.2. Failure of the feeder to meet the re-
quirements shall be cause for rejection of the represented lot.
4.5.3.4 Interchangeability testing.
4.5.3.4.1 In plant.
4.5.3.4.1.1 Feeders. A sample of three feeders shall be selected
from each month's production and tested for interchangeability (see 3.4)
using the test method specified in 4.6.3.1.1. Feeders taken for inter-
changeability testing shall have been found satisfactory in all examinations
and tests. The three feeders shall be inspected fo and shall comply
with the requirement for timing and torque after interchange of parts
(see 4.5.2.2.5 and 4.5.2.2.6). In addition, the feeders shall be tested
for functioning requirements after interchange of parts using the test
methods specified in 4.6.1. Failure of feeders to meet the requirements
of the interchangeability test shall be cause for rejection of the
represented lot. Sample size and test methods shall be the same for
retest.
4.5.3.4.1.2 Concurrent repair parts. A sample of two parts from
each inspection lot of concurrent repair parts shall be subjected to the
interchangeability test specified in 4.6.3.1.2. Failure of any part to
meet the requirements shall be cause for rejection of the represented
lot. A sample of double the number of parts used in the original test
shall be tested from each reconditioned lot using the test method speci-
fied in 4.6.3.1.2.
4.5.3.4.2 Interplant. When feeders are manufactured concurrently
by more than one contractor, each contractor shall forward monthly three
feeders for the interplant interchangeability test specified in 4.6.3.2
(see 6.1). The contractor will be informed of any failure of the feeders
to meet prescribed requirements. Upon completion of testing agency in-
spection, samples may be commercially packaged and will be returned to
the contractor for repackaging in accordance with procurement documents
at the contractor's expense.
4.5.3.5 Component parts and concurrent repair parts testing. Raw
material testing, part testing, and certification shall be performed in
accordance with the criteria specified in the contract (see 6.1). This
all include chemical analysis and physical tests of materials and
tests of protective finish, heat treatment, bonding and function of parts
as applicable. The contractor shall accomplish these tests prior to
assembly of parts into the end item.
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