MIL-DTL-5421D
4.6.10 Cold resistance. The tube shall be subjected to a temperature of -65 °C (-85 °F)
for 48 hours. There shall be no evidence of damage. At the option of the procuring activity, any
or all tests shall be conducted after this test.
4.6.11 High pressure leakage. The impact pressure opening and drain holes shall be sealed
and a test manometer connected to the impact connection. A pressure of 39.29 psi (80 inches of
mercury) shall be applied. The pressure shall not drop below 39.19 psi (79.80 inches of mercury)
during a one-minute period.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as
specified in the contract or order (see 6.2). When packaging of materiel is to be performed by
DoD or in-house contractor personnel, these personnel need to contact the responsible packaging
activity to ascertain packaging requirements. Packaging requirements are maintained by the
inventory control point's packaging activities within the military service or defense agency, or
within the military service's system command. Packaging data retrieval is available from the
managing military department's or defense agency's automated packaging files, CD-ROM
products, or by contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful,
but is not mandatory.)
6.1 Intended use. The pitot tubes covered by this specification are intended for use on
aircraft to provide an accurate source of impact pressure for use with airspeed indicators under
service conditions of airspeeds up to 650 knots and temperatures to -65 °C (-85 °F).
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Style and rated voltage (AN or AS part number) (see 1.2.1).
c.
The specific issue of individual documents referenced (see 2.2.1 and 2.3).
d.
First article, if required (see 3.2 and 4.3).
e.
Installation instructions (see 3.9.1).
f.
Information required for first article sample (see 4.3.1).
g.
Packaging requirements (see 5.1).
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