Step 1. With the test item in the chamber in its appropriate logistic configuration, adjust the chamber air temperature to the high or low temperature extreme specified in the test plan (T1) at a rate not to exceed 3°C/min (5°F/min). Stabilize the temperature for a period as determined in accordance with paragraph 2.3.5.Step 2. Transfer the test item in no more than one minute to an atmosphere at temperature (T2) that will produce the thermal shock specified in the test plan, and stabilize the temperature for a period as determined in accordance with paragraph 2.3.5.Step 3. If required in the test plan, evaluate the effects of the thermal shock on the test item to the extent practical.Step 4. Transfer the test item back to the T1 environment in no more than one minute. Stabilize the temperature for a period as determined in accordance with paragraph 2.3.5, and evaluate the thermal shock effects (if required).Step 5. Return the test item to standard ambient conditions.Step 6. Examine the test item and, if appropriate, perform an operational check. Record the results for comparison with pretest data. If the test item fails to operate as intended, see paragraph 5 for analysis of results. 503.5-