MANUFACTURER PART NUMBER DESCRIPTION A. Securaplane 444-DMC-57.1 UHF Antenna Securaplane 500 Security System B. Sensor Systems S67.1575-165 Aircell Iridium Satellite Telephone Antenna For removal and installation procedures for above antennas, reference The Gulfstream G550 Maintenance Manual, ATA Chapter 23-12-03 VHF Ante