MIL-DTL-5421D
3.9.2 Mounting screws. The contractor shall furnish four NASM35207-226 mounting
screws and four NASM35338-41 lockwashers for installing the assembly.
3.9.3 Envelope. When required (see 6.2), an envelope containing the installation
instructions, mounting screws, and lockwashers shall be furnished with each tube. The following
information shall be printed on the face of the envelope:
IMPORTANT
This envelope contains installation
instructions and mounting screws.
3.10 Workmanship. Workmanship shall be in accordance with the best practice for high
quality aircraft instruments.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are as
follows:
a. First article inspection (see 4.3).
b. Conformance inspection (see 4.4).
4.2 Inspection conditions. Unless otherwise specified, all inspections shall be performed
in accordance with the test conditions specified in paragraphs 4.2.1 and 4.2.2.
4.2.1 Ambient temperature. The ambient temperature for all tests shall be 20 °C to 30 °C
(68 °F to 86 °F).
4.2.2 Rated voltage. The rated voltage for type 1 tubes shall be 24 volts direct current
(VDC) and the voltage for type 2 tubes shall be 115-volt, 400 Hz, single phase alternating
current.
4.3 First article inspection. First article inspection shall consist of the individual tests of
4.5 and all the tests of 4.6.
4.3.1 First article sample. The first article sample shall consist of three tubes of each part
number specified in the acquisition order. The sample shall be representative of production pitot
tubes. The samples shall be identified with the manufacturer's part number and any other
information specified by the procuring activity (see 6.2).
4.4 Conformance inspection. Conformance inspection shall consist of the individual
tests of 4.5 and the tests 4.6.1 through 4.6.6.
4.4.1 Conformance inspection sample. Five tubes that have passed the individual tests shall
be selected at random from each lot of 500 tubes or less. The five selected tubes shall be subjected
to the tests of 4.6.1 through 4.6.6. A lot shall consist of all the tubes of the same part number
submitted for acceptance under the same acquisition order.
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