📘14 CFR §91.413 – ATC Transponder Tests and Inspections
🚩 Overview
ATC transponders enhance radar identification, position tracking, and safety. To ensure accuracy and reliability, the FAA mandates periodic transponder tests and inspections.
✅ Key Operational Requirements
📡 1. Required Tests and Inspections
Transponders must be tested and inspected every 24 calendar months to ensure accurate operation and compliance with FAA standards.
🔧 2. Authorized Inspection Personnel
Transponder tests and inspections must be performed by:
Certified repair stations.
Appropriately rated mechanics (holding necessary avionics or transponder certifications).
📋 3. Documentation
Following each inspection, documentation must be entered in the aircraft’s maintenance logbooks, detailing:
Type of inspection.
Date performed.
Results of the test (Pass/Fail).
Identification and certification number of the authorized individual or repair station.
🚫 4. Operational Compliance
Aircraft with transponders may not operate unless these required tests and inspections are current and properly documented.
🛩️ Example Scenario
You're preparing for a flight in Class C airspace, requiring an operable Mode C transponder. Before departing, confirm your aircraft’s transponder inspection was completed within the last 24 calendar months, verifying the logbook entries clearly show the inspection date, pass status, and inspector details.
📌 CFI Pro Tips
Logbook Checks: Train students to habitually verify transponder inspection dates and records during their preflight planning, emphasizing their responsibility for compliance.
Awareness and Compliance: Explain clearly how these inspections impact legal aircraft operation and the potential safety implications of non-compliance.
📚 Further Reading and Official References
14 CFR §91.413 (Full FAA Regulation): https://www.ecfr.gov/current/title-14/chapter-I/subchapter-F/part-91/subpart-E/section-91.413
FAA Advisory Circular AC 43-6D (Transponder and Altimeter Tests): https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_43-6D_CHG_1.pdf
FAA Aeronautical Information Manual (AIM) – Transponder Operation: https://www.faa.gov/air_traffic/publications/atpubs/aim_html/chap4_section_1.html
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