MIL-DTL-22263C
3.2.2 Fungus-proof materials. Materials that are not nutrients for fungi shall be used
to the greatest extent practicable. In cases where materials that are nutrients for fungi must be
used, such materials shall be treated with a fungicidal agent as approved by the procuring
activity.
3.3 Finish.
3.3.1 Aluminum alloy parts. Where practicable, all aluminum alloy parts shall be
anodized in accordance with MIL-A-8625.
3.3.2 Steel parts. Steel parts shall be corrosion proof or resist to corrosion shall be
passivated per SAE-AMS2700. Non-corrosion-resistant steel parts shall not be used.
3.3.3 Titanium parts. Finish shall not be required for titanium parts.
3.4 Dissimilar metals. Connecting tubing with coupling parts shall be compatible
and shall meet the requirements of MIL-STD-889.
3.5 Design and construction. The coupling shall be designed for connecting variable
ferrule type tubing end when used in aircraft power plant fuel systems. Typical couplings
installation shall be as shown in figure 1. The coupling dimensions and weights without O-
ring shall be in accordance with table II. The design and construction of the coupling shall
be such that it shall withstand the strains, jars, vibrations and other conditions incident to
aircraft installations and service usage.
3.5.1 Threads. Machine screw threads shall conform to SAE-AS8879. All external
or internal threaded parts shall be securely locked in such a manner as to prevent loosening
under test conditions specified herein and under normal service usage. Provisions for safety
wiring shall be provided. Safety wires shall be installed in accordance with NASM33540
and shall conform to NASM20995. Wrenching features shall conform to MS33784. Tools
shall not be required for torquing.
3.5.2 Angular misalignment. The coupling shall be capable of being installed with a
maximum tubing or ferrule installation misalignment of 3 degrees in any direction
(see figure 3 and figure 4).
3.5.3 Flexure. The coupling shall provide for one degree flexure in any direction
from any installed position. The connector shall maintain a space between tubing and
ferrules of 0.062 inch minimum to 0.188 inch maximum.
3.5.4 Pe rmanent deformation. I nst al la ti on of t he coupling on tubing ends
under conditions specified herein shall not produce a permanent deformation of the tubing or
fitting.
3.5.5 Tubing. The couplings shall be designed for connecting tubing ends conforming to
figure 2. The tubing end dimensions shall be in accordance with table III.
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