ENSTROM 480B RFM SUPPLEMENT 3-1FAA Approved: Dec 19/18Report No. 28-AC-078 Dec 3/18CHAPTER 3. EMERGENCY PROCEDURES3-1. GeneralRefer to the basic RFM.3-2. Abnormal ProceduresWhen the GPS/SBAS receiver is inoperative or GPS positioninformation is not available or invalid, the GTX will nolonger be transmitting ADS-B Out data.Figure 3-1 shows when ADS-B is not transmitting.Figure 3-1. ADS-B 1090 Failed ScreenFigure 3-2 shows if both the transponder and ADS-B arenot transmitting.Figure 3-2. ADS-B 1090 and Transponder Failed Screen1. In the event of either a “NO 1090ES TX” or a“TRANSPONDER FAILED” annunciation, verify validposition with interfaced GPS position sources.This electronic document is not linked to a subscription for revision control or distribution. Refer to the Optional EquipmentSupplement Publications Status link under the Technical Support Page of the Enstrom Helicopter website for the current revisionlevel of this Rotorcraft Flight Manual Supplement.UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED