TM 1-1520-240-MTF4-61w. Set Data switch to POS and manuallyrecord present position coordinates.x. Set Data switch to DIS-TG and manuallyrecord distance to Cp-2 (line two).y. Return to ground station.11. GPS/Doppler Flight Test Data AnalysisCompare all MARK positions with the actualpositions of the corresponding Check Point.Compare differences, if any, with Allowable Nav-igation Error Limits outlines in TM11-5826-308-12. If errors exceed the AllowableNavigation Error Limits, use the self-test of theGPS system and fault isolation procedures todetermine the failure mode.12. Zeroize loaded keys from GPS memory.NOTEZeroize at termination of test flight or so dic-tated by operations.NOTEAircraft power must be connected, or powerapplied to aircraft.a. Lift zeroize switch guard and toggle switch.b. With the GPS receiver turned on, turn DataSwitch to Stat. Observe message on Page1, Line 2. The message ZEROED indicatesall keys have been erased from memory andthe unit is unclassified.O AN/ASN-128B DOPPLER WITH EMBEDDED GPS13. DGNS Flight Test Procedure.a. Verify proper system operation with MODEswitch to TEST. Left display GO and Rightdisplay ALL. MAL lamp is off.
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