MIL-DTL-26666G
3.5.7 Burst pressure. The hose assembly shall not burst or show any evidence of material failure
when tested in accordance with 4.7.7.
3.5.8 Overtightening torque. The end fitting of the hose assembly shall not show any evidence of
material failure, thread damage, deformation or difficulty in turning the swivel nut on the nipple by hand,
when tested in accordance with 4.7.8
3.5.9 Pressure impulse cycling (see 4.7.9).
3.5.9.1 Ambient temperature pressure impulse cycling (see 4.7.9.1). The hose assembly when
tested in accordance with 4.7.9.1 shall not show any evidence of cracking, splitting, distortion, or leakage.
3.5.9.2 Elevated temperature pressure impulse cycling (see 4.7.9.2). The hose assembly when
tested in accordance with 4.7.9.2 shall not show any evidence of cracking, splitting, distortion, or leakage.
3.5.10 Cleanliness. All hose assemblies shall be free from oil, grease, dirt, moisture, cleaning
solvents and other foreign material, both internally and externally. The hose assembly shall not contain
any particle size larger than 30 microns or a total residue weight greater than one milligram per milliliter of
the measured fluid sample, when tested in accordance with 4.7.10.
3.6 Identification of product. The hose assembly shall be identified by a permanently snug-fitting
aluminum or stainless steel band around the hose near the end fitting. The band shall be designed to
remain tight on the hose to prevent relative movement and resultant chafing. Where the hose assembly
exceeds 4 feet (1.22 m) in length, a band shall be attached near each end fitting of the assembly. The
metal band shall be marked in raised, etched, or stamped lettering with the following information
appropriately identified:
a. Number and title of this specification.
b. DO NOT USE ON AIRCRAFT
c. Date of assembly in month and year.
d. The rated working pressure in psig, followed by the word PNEUMATIC.
e. Manufacturer's name and trademark.
f. PIN (see 1.2).
g. Hose manufacturer's cage code if different from hose assembly manufacturer.
3.7 Pre-packaging. Immediately after cleaning the hose assembly the end fittings on both ends of
the hose shall be capped or plugged. The hose assembly shall then be double packed and sealed with
polyethylene (.006-inch thick minimum (0.15 mm)) before they are put into a shipping container (see 5).
Pad sharp edges before packaging to preclude puncturing the package. Exercise care in packaging to
prevent shredded or abraded polyethylene material from becoming a contaminant.
3.8 Workmanship. The hose assembly, including all parts, shall be uniform in quality and free from
irregularities or defects which could adversely affect safety, performance, reliability, or durability. All
surfaces shall be smooth and free from burrs.
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