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12/10/15                                                                                                                                AIM


                        FIG 6-2-15                                                                        FIG 6-2-16
                 Negative (Aircraft)                                             Message received and understood (Aircraft)

               Negative reply from aircraft:


                                                                                       Message received and understood by aircraft:
                                                                                       Day or moonlight - Rocking wings
                                                                                       Night - Green flashed from signal lamp




                     NEGATIVE (NO)
                        Fishtail plane



                                                                 FIG 6-2-17
                                         Message received and NOT understood (Aircraft)


                                          Message received and NOT understood by aircraft:
                                          Day or moonlight - Making a complete right-hand circle
                                          Night-Red flashes from signal lamp.




Emergency Services Available to Pilots                                                                                                6-2-11