TM 1-1520-240-MTF4-54c. Check light operation high and lowsensitivity over appropriate markers.8. Transponder AN/APX-100 and Radar SignalDetecting Set AN/APR-39.a. Transponder master switch — STBY. Allow2 minutes for warmup. Check CODE OFFflag on pilot’s barometric altimeter out ofsight.b. At a minimum altitude of 2,000 feet anddistance of 30 miles, request a transpondercheck from an appropriate radar facility.c. Check all modes, including emergency.Check AIMS altimeter.d. Obtain operation information from radarfacility.e. While checking transponder, checkoperation of radar signal detecting set.Check that detecting set displays bearing toall known radar facilities.9. Doppler Navigation Set (AN/ASN-128).a. Verify proper system operation with MODEswitch at TEST and display indicates GO.(1) Fly helicopter over surveyed testcourse (figure 4-1) at cruise airspeeds.The altitude should be low enough tominimize error in establishing positionover checkpoints.(2) Enter magnetic variations, lateral andlongitudinal coordinatesof thecheckpoints.
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