MIL-DTL-5421D
3.5.2 Screw threads. Machine screw threads greater than 0.060 inch in diameter shall be
in accordance with MIL-S-7742.
3.5.3 Drainage. The tube shall be designed so that when ice on the tube is melted under
flight conditions, the resulting water shall drain from the tube and not be conducted into the
impact pressure line where it may freeze.
3.5.4 Heating element. The tubes shall be electrically heated. The heating element placed
in the nose of the tube shall have a minimum rating of 120 watts at the rated voltage with the outer
shell of the tube immersed in a water-ice mixture at a temperature of 0 °C (32 °F).
3.5.5 Electrical circuit. The electrical circuit of the tube shall be of the two-wire type and
shall be provided with an AN3115-1 snap type receptacle.
3.5.6 Sleeve assembly. The sleeve assembly shown on SAE AS5813 drawing shall be
furnished as a part of each SAE AS5813 tube.
3.5.7 Shipping caps. The threads of the coupling and the total pressure opening shall be
suitably protected by a slip-on cap of non-strategic material.
3.6 Interchangeability. All parts having the same manufacturer's part number shall be
directly and completely interchangeable with each other with respect to installation and
performance. Changes in manufacturer's part numbers shall be governed by MIL-STD-31000.
3.7 Performance. The tubes shall satisfy the performance requirements specified in
section 4 when subjected to the applicable tests.
3.8 Identification of product. The following information shall be etched, engraved, or
stamped on each tube in a location that will not interfere with the proper operation of the tube.
Name of tube (as shown on the AN or AS drawing)
Rated voltage
AN or AS part number
National stock number
Manufacturer's part number
Contract or order number
Manufacturer's name or trademark
U.S. Property
Word "TOP" at location specified on the AN or AS drawing
3.9 Installation.
3.9.1 Installation instructions. Unless otherwise specified (see 6.2), the contractor shall
furnish one printed copy of instructions for each tube. The instructions shall contain illustrations
and diagrams if necessary. Prior to printing, two copies shall be furnished to the procuring
activity for approval. The instructions shall be arranged on a single sheet of paper either
8-1/2 inches X 11 inches, or 11 inches X 17 inches.
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