option 3 has been selected for testing by depressing and releasing oss 18.
The number 3 hightlights and the zeros under he station containing RIUs will momentarily change to "1" and then back to "0".
If a station option test remains a "1" then that station failed the option test.
In this example, Stations 1, 3, 7 and 9 have RIUs installed as indicated by the zeros on the A and B RESP rows.
Stations 1 and 9 RIUs will be commanded to "Station Select" and Stations 3 and 7 will be commanded to "Nose Arm/Uncage".
The "1" under Station 3 has remained instead of returning to zero.
As a result, Station 3 has failed this Option 3 test.