The Emergency Escape Sequencing System Test Set (EESSTS) was designed to test the Emergency Escape Sequencing System (EISS) on the F-15 aircraft.  The EESSTS may be powered by either standard 120V/60Hz power or 120V/400Hz aircraft power to allow for flight line testing of the escape system.

The EESSTS is designed to safely permit detection and isolation of all system faults on the EESS.  The fail safe design, in addition to tester self-test, provides a wrap-around test capability for fault detection of test cables.  The EESSTS displays all faults to the operator to direct necessary maintenance, repair or disposition.  The EESSTS will not inadvertently fire or initiate any EISS component and it provides personnel safety during all tests.

The EESSTS consists of all cables necessary to perform a complete end-to-end check on the escape system, testing of the Mode Selector, and continuity through the EED bridgewires.   

It was designed using Commercial Off The Shelf (COTS) components making it economically feasible in small quantities.

The EESST is equipped with a Built-in-Test (BIT), which provides better than 95% fault detection.  The BIT is initiated when power is first applied and requires the test cables to be not connected.  Only a successful BIT will allow the operator to verify the cable set to be used during flight line or maintenance testing.  An error code displayed during the cable self-test function will require corrective action and retest.