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.

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 num-ber, rapid action change number, or change number. Each new expiration date will super-sede 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.