MIL-PRF-28523C
6.3 Recommended working pressure. Recommended working pressure for the hose covered by
this specification is 400 psi (2 758 kPa).
6.4 Sampling procedures.
6.4.1 Sampling for examination. Examination of the hose will be based on inspection level II and
an Acceptable Quality Level (AQL) of 2.5 percent defective for major defects and 4.0 percent
defective for minor defects (see 4.5.1).
6.4.2 Sampling for tests. Tests of the hose will be based on inspection level S-3 with an AQL of
4.0 percent defective. A representative sample 3-foot (914 mm) in length will be cut from lengths
selected from each lot. The contractor will reattach couplings to the remaining length from which
the 3-foot (914 mm) length was cut. After the couplings have been reattached, the remaining
length of the hose will be used to conduct the hydrostatic proof pressure test specified in 4.7.1.
When the remaining length has passed the hydrostatic proof test, it will be accepted as a full
length of hose. One-half (18 inches (457 mm)) of the 3-foot (914 mm) sample will be used for the
burst test; the remainder will be used for the other tests listed in table II (see 4.7.2).
6.5 First article. When a first article inspection is required, the item will be tested and should be a
first production item or it may be a standard production item from the contractor's current
inventory as specified in 4.2. The first article should consist of one hose or hose assembly. The
contracting officer should include specific instructions in acquisition documents regarding
arrangements for examination, test, and approval of the first article.
6.6 Part or Identification Number (PINs). The specification number, class, type, and size are
combined to form PINs for hose assemblies are established as follows:
XX
XX
M28523
X
Federal specification number
Hose size code letter (see 6.6.1)
Length in feet (mm)
Length in inches (mm)
6.6.1 Hose size. Hose size is designated by one code letter (see table III).
TABLE III. Hose size code letter.
Hose size code letter
A
B
Hose inside diameter (inches (mm))
2.0 (51 mm)
3.0 (76 mm)
8
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