Samples shall be subject to Procedure I of MIL-STD-810F Method 500.4 at a pressure of 18.6 kPaa (2.7 psia) (equivalent to approx. 40,000 ft.) for a one hour period. Samples shall be subjected to a pressure (altitude) change rate between 0.67 psi/minute (2000 feet/minute) and 0.24 psi/minute (750 feet/minute). Samples may be tested in any position.
"