Next, determine the installed-life expiration date of the CAD by referring to the NAVAIR 11-100-1 series manual. Obtain the installed-life figure (number of months or years) and add that figure to the date (month) the CAD’s hermetically sealed container was opened. The resulting sum (date) will be the installed-life expiration date for the CAD in question. Example: Date opened 0879 + Installed life in months +42 Installed-1ife expiration date 0283 Then, compare the two dates derived (shelf life and installed life). Whichever date occurs first is the CAD service-life expiration date. Example: Shelf life 0585 Installed Life 0283 Service-life expiration date 0283 Since only the month and year are used in computing service-life dates, the date the hermetically sealed container is opened and the expiration date must be computed to the last day of the month involved. If the date the sealed container was opened is not available, the installed life must be computed from the date of manufac- ture as determined from the lot number. MARKING EXPIRATION DATES Before installing a CAD in an aircraft system, both CAD service-life expiration dates (shelf life and installed life) must be known. The time limit that is exceeded first is the service-life expiration date of the CAD. This date must be entered into the aircraft logbook. Use permanent indelible ink for marking CADS with container open dates and service-life expiration dates. DO not scribe, scratch, or electroetch these dates, as damage will occur to the CAD’s corrosion-resistant surface. The marking pen, NSN 7520-00-043-3408, is available from GSA supply and is recommended for this purpose. When you install a CAD in an aircraft system, a log entry must be made on OPNAV Form 4790/26A as directed by OPNAV- INST 4790.2. When a CAD’s hermetically sealed container is opened, the container open date and the service-life expiration date (month and year) must be marked with indelible ink on the container and on each CAD in the container. SERVICE-LIFE EXTENSION Contingency service-life extensions for the CADS listed in the NAVAIR 11-100-1, not to ex- ceed 30 days, may be granted by the com- manding officer or his authorized representative. These extensions may be applied to a specific CAD on a one-time-only basis when replace- ments are not available and failure to extend the service life would disrupt flight opera- tions. The contingency authority is granted on the condition that Naval Ordnance Station (NAVORDSTA), Indian Head, Maryland; NAV- AIRSYSCOM, Washington, D.C.; and SPCC, Mechanicsburg, Pennsylvania be immediately notified by message or speed letter when such authority is exercised. When the situation warrants, an additional service-life extension beyond the 30-day con- tingency extension may be requested by message from the NAVORDSTA. All extensions beyond 30 days must be approved by the NAVORDSTA or NAVAIRSYSCOM. All approved additional service-life extensions will be transmitted by message to the activity making the request. When a service-life extension is granted, an entry must be made in the aircraft logbook. When an aircraft is transferred with a service-life extension in effect, the gaining activity must be notified, and no new contingency service-life extensions may be granted by the commanding officer of the gain- ing activity. SERVICE-LIFE CHANGE The permanent service life of a CAD may be changed only by a rapid action change (RAC), interim rapid action change (IRAC), or formal change to NAVAIR 11-100-1 as directed by Commander, Naval Air Sys- tems Command (COMNAVAIRSYSCOM), Washington, D.C. If the change affects those items installed in an aircraft, the change will be recorded in the aircraft’s logbook. 2-25