Transponder Emergency Code Matrix: 7500 vs 7600 vs 7700
CASA Ref: CASR Part 61 MOS Schedule 3 CNAV 1.4 · FAA Ref: FAA-S-ACS-6C Area IX Emergency Operations
Scenario & Physics Summary
Standard International Transponder Emergency Codes: 7500 (Hijack), 7600 (Radio Loss / Comms Failure), 7700 (General Emergency).
Interactive 3D Visual Plates & Scenario Media
Plate 1: Transponder Emergency Code Matrix: 7500 vs 7600 vs 7700
Plate 2: Transponder Emergency Code Matrix: 7500 vs 7600 vs 7700
Plate 3: Transponder Emergency Code Matrix: 7500 vs 7600 vs 7700
Plate 4: Transponder Emergency Code Matrix: 7500 vs 7600 vs 7700
Plate 5: Transponder Emergency Code Matrix: 7500 vs 7600 vs 7700
Plate 6: Transponder Emergency Code Matrix: 7500 vs 7600 vs 7700
Aerodynamic & Operational Physics
Transponder pulse framing sends 4-digit octal codes to SSR (Secondary Surveillance Radar).
7500: Unlawful Interference / Hijack.
7600: Radio Communications Failure (Lost Comms protocol under AIP / 14 CFR 91.185).
7700: General Mayday / Pan-Pan Aviation Emergency.
CASA & FAA Exam Gotcha Alert
CASA / FAA Exam Trap: "Seven-Seven - Going to Heaven" (7700 Emergency), "Seven-Six - Radio Needs Fix" (7600 Comms), "Seven-Five - Man with a Knife" (7500 Hijack).
Frequently Asked Questions & Exam Explanations
What squawk code is used for total radio failure?
Squawk 7600 for radio communications failure.
Master Transponder Emergency Code Matrix: 7500 vs 7600 vs 7700 in the Simulator
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