TM 1-1520-240-MTF4-63k. Fly shortest distance to first destination frompresent position, set DISPLAY switch toDIST/BRG/TIME position and steerhelicopter to bearing displayed. As an aid tomaintaining course, set DISPLAY switch toXTK/TKE position and steer helicopter tokeep track angle error (TKE) nominally zero.If display indicates a L (left) TKE, the aircraftmust be flown to the left to zero the error.l. At first destination set DISPLAY switch toPP and KYBD key is depressed andreleased note the position altitude andmagnetic variation.m. Fly to the remaining destination using theprocedures described in (K) and (L) above.n. Return to ground station.14. DGNS Flight Test Data Analysis.Compare all MARK positions with the actual positionsof the corresponding Check Point. Compare differences,if any, with Allowable Navigation Error Limits outlines in TM11-5841-305-12. If errors exceed the Allowable NavigationError Limits, use the self-test of the GPS system and faultisolation procedures to determine the failure mode.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. Release toggle switch and close switchguard.
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