B with a 5,000-pound capacity and is furnished in a minimum length of 240 inches.

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MIL-PRF-27260D

4.7.2 Strap strength.

The strap material shall be tested to failure in a tensile test machine at a constant crosshead rate

of 3.0 � 1.0 inches per minute in order to verify compliance with 3.8.7.

4.7.3 Environmental conditions.

Environmental testing shall be planned and conducted in accordance with RTCA/DO-160.

4.7.3.1 Fungus resistance.

The tie downs shall be subjected to the fungus resistance test in accordance with RTCA/DO-160,

Section 13, Category F. The tie down shall be tested in accordance with 4.7.4 immediately after

the fungus test is complete. Any evidence of failure during or after proof load testing shall be

cause for rejection.

4.7.3.2 Humidity.

The tie downs shall be subjected to the humidity tests in accordance with RTCA/DO-160, Section

6, Category C. During this test, the tie down shall be subjected to the tests as specified in

4.7.1.2, 4.7.1.2.1, and 4.7.1.3.

4.7.3.3 Salt fog.

The tie down shall be subjected to the salt fog test in accordance with RTCA/DO-160, Section 14,

Category S, 5% Salt Spray. At the conclusion of this test, the tie down shall be subjected to the

tests as specified in 4.7.1.2, 4.7.1.2.1, and 4.7.1.3.

4.7.3.4 Sand and dust.

The tie down shall be subjected to the sand and dust test in accordance with RTCA/DO-160,

Section 12, Category D. At the conclusion of this test, the tie down shall be subjected to the tests

as specified in 4.7.1.2 and 4.7.1.3.

NOTE: If 140 mesh silica flour is used in accordance with RTCA/DO-160, local environmental

laws and criteria shall be observed.

4.7.3.5 Vibration.

The tie down shall be kept under a tension of 200 pounds for a 24-hour period. While under

tension the tie down assembly shall be subjected to a vibration test in accordance with

RTCA/DO-160, Section 8, Standard Sinusoidal Vibration Test Procedure, Figure 8-4, Curve Y.

4.7.3.6 Low temperature.

The tie down shall be subjected to the low temperature test in accordance with RTCA/DO-160

Section 4, Category A3, Ground Survival Low Temperature Curve, at a temperature of -65 �F.

During this test, the tie down shall be subjected to the tests as specified in 4.7.1.2, 4.7.1.2.1, and

4.7.1.3.

4.7.3.7 High temperature.

The tie down shall be subjected to the high temperature test in accordance with RTCA/DO-160

Section 4, Category A3, Ground Survival High Temperature Curve, except the maximum

temperature shall be 160 �F. During this test, the tie down shall be subjected to the tests as

specified in 4.7.1.2, 4.7.1.2.1, and 4.7.1.3.

4.7.3.8 Solar radiation.

The tie down shall be subjected to four cycles of 24-hour solar radiation testing in accordance with

MIL-STD-810, Method 505.5, Procedure II, to simulate 10 days of continuous sunlight exposure.