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 manufacture 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) should be computed. The time limit that is exceeded first will be the service-life expiration date of the CAD. The service-life expiration date must be entered in the aircraft logbook. Use permanent ink for marking CADs with container opened dates and service-life expiration dates. Do not scribe, scratch, or eletroetch these dates, as damage will occur to the CAD’s corrosion resistance 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 OPNAVINST 4790.2 (series). When a CAD’s hermetically sealed container is opened, the container opened 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 (series), not to exceed 30 days, may be granted by the commanding officer or his authorized repre- sentative. The extensions may be applied to a specific CAD on a one-time only basis when replacements are not available and failure to extend the service-life would disrupt flight operations. The contingency authority is granted on the condition that Naval Ordnance Station, Indian Head, Maryland; NAVAIRSYSCOM, 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 contingency extension may be requested by message from NAVORDSTA. All extensions beyond 30 days must be approved by the NAVORDSTA or NAVAIRSYSCOM. All ap- proved 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 gaining activity. Service-life Change The permanent service life of a CAD maybe changed only by a rapid action change (RAC), interim rapid action change (IRAC), or formal change to NAVAIR 11-100-1 (series) as directed by COMNAVAIRSYSCOM, Washington, D.C. If the change affects those items installed in an aircraft, the change will be recorded in the aircraft’s logbook. A line will be drawn through the service-life expiration date shown and the new computed expiration date entered, citing the authority for the change; for example, message number, rapid action change number, or change number. Each new expiration date will supersede the previous date. The latest expiration date entered in the aircraft logbook will always be the final date the CAD may remain installed in the aircraft. When a contingency service-life extension has been authorized for a specific CAD, the new computed service-life expiration date (month and year) will be added to the original aircraft logbook entry for that CAD. When an additional service- life extension has been granted for a specific CAD, the new service-life expiration date (month and year) will be added to the original aircraft logbook entry. CAD Maintenance Policy CAD maintenance policy prohibits unauthor- ized maintenance or adjustments to a CAD at any of the three levels of maintenance: organizational, intermediate, or depot. Authorized maintenance actions are limited to removal, inspection, and replacement, unless specifically detailed in the aircraft MIM or by a technical directive. CADs and items of equipment in ejection systems are for one-time use only. They are never to be refurbished or used again after firing. This is equally true of functional equipment, rigid lines, plumbing lines, and hoses. Ejection seats and escape system components that have been used 1-10