TM 1-1520-240-103-3-35/(3-3-36 blank)e. Repeat steps b. thru d. to load additional keys.f. Turn KYK-13 Mode switch to OFF.g. Disconnect KYK-13 from aircraft receptacle.3-3-59. GPS Zeroize Switch.(fig. 2-1-8)The GPS Zeroize switch is located on center instrumentpanel, right side of AN/APR-39AV(1) Indicator, and isused to erase any crypto data and all navigational infor-mation stored in the GPS Receiver.This zeroize switch consists of a guarded toggle switch.3-3-60. Normal Operation GPS Zeroize Switch.NOTEAircraft battery must be connected, or powerapplied to aircraft.a. Lift protective guard from zeroize toggle switchand activate switch.b. If GPS receiver is on, turn Data Switch to Stat.Observe message on Page 1, Line 2.The message ZEROED indicates a successful attemptto erase information stored in the GPS receiver.The message ZERO FAIL indicates an unsuccessful at-tempt to erase the information. The GPS receiver re-mains classified.c. An alternate method to zeroize the GPS receiveris to use the C-11702/UR and GPS Control Unit keyboardas follows:(1)Select STAT page 1.(2)Enter ZZ on line 4, and push Line Select Key4. (3)If ZEROIZED message is displayed onSTAT Page 1, Line 2, the GPS receiver is declassified.(4)If ZERO FAIL message is displayed, zer-oization was not successful and the GPS receiver re-mains classified.Figure 3-3-9. Remote GPS Data LoaderReceptacle/KYK-13 Fill Panel
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