# yaml-language-server: $schema=../../../_schema/ssrf-lite-0.10.0.schema.json
# SSRF-Lite: US Aviation Airband — Common & Itinerant Frequencies (VHF AM voice)
# Notes: RX-only reference. AM voice, 25 kHz channels (6K00A3E). TX requires an
#        FCC Part 87 aeronautical authorization; treat as receive-only in codeplugs.
# Sources:
# - FCC 47 CFR Part 87 (Aviation Services)
# - FAA Aeronautical Information Manual (AIM) 4-1-11 (Designated CTAF/UNICOM/MULTICOM)

$schema: "../../../_schema/ssrf-lite-0.10.0.schema.json"
ssrf_lite_version: "0.10.0"
ssrf_lite:
  sources:
    - name: "FCC 47 CFR Part 87 — Aviation Services"
      url: https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D/part-87
      accessed: '2026-07-16'
    - name: "FAA Aeronautical Information Manual (AIM) 4-1-11"
      url: https://www.faa.gov/air_traffic/publications/atpubs/aim_html/chap4_section_1.html
      accessed: '2026-07-16'

authorizations:
  - id: auth_rx_only_aviation
    authority: "FCC / FAA"
    service: aviation
    class: null
    identifier: null
    notes: >
      Airband monitoring is unlicensed for receive. Transmitting on aeronautical
      VHF requires an FCC Part 87 aircraft or ground station authorization.

channel_plans:
  - id: airband_itinerant_plan
    name: "Aviation Airband — Common/Itinerant"
    service: aviation
    channels:
      - name: "Guard 121.5"
        freq_mhz: 121.500
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "International aeronautical emergency (Guard)."
      - name: "Flight Watch 122.0"
        freq_mhz: 122.000
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "Legacy En Route Flight Advisory Service (EFAS); largely discontinued."
      - name: "FSS 122.2"
        freq_mhz: 122.200
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "Common Flight Service Station (FSS) frequency."
      - name: "CTAF/UNICOM 122.7"
        freq_mhz: 122.700
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "CTAF/UNICOM at uncontrolled airports."
      - name: "CTAF/UNICOM 122.725"
        freq_mhz: 122.725
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "CTAF/UNICOM at uncontrolled airports."
      - name: "Air-to-Air 122.75"
        freq_mhz: 122.750
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "Fixed-wing air-to-air communications."
      - name: "CTAF/UNICOM 122.8"
        freq_mhz: 122.800
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "CTAF/UNICOM at uncontrolled airports."
      - name: "MULTICOM 122.85"
        freq_mhz: 122.850
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "MULTICOM."
      - name: "MULTICOM/CTAF 122.9"
        freq_mhz: 122.900
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "MULTICOM; CTAF at airports without UNICOM."
      - name: "MULTICOM 122.925"
        freq_mhz: 122.925
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "MULTICOM for natural resource/firefighting operations."
      - name: "CTAF/UNICOM 122.95"
        freq_mhz: 122.950
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "CTAF/UNICOM at towered airports (when tower closed)."
      - name: "UNICOM 122.975"
        freq_mhz: 122.975
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "UNICOM (high-altitude airports)."
      - name: "CTAF/UNICOM 123.0"
        freq_mhz: 123.000
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "CTAF/UNICOM at uncontrolled airports."
      - name: "Heli Air-to-Air 123.025"
        freq_mhz: 123.025
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "Helicopter air-to-air communications."
      - name: "CTAF/UNICOM 123.05"
        freq_mhz: 123.050
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "CTAF/UNICOM (heliports)."
      - name: "CTAF/UNICOM 123.075"
        freq_mhz: 123.075
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "CTAF/UNICOM (heliports)."
      - name: "SAR 123.1"
        freq_mhz: 123.100
        emission: 6K00A3E
        bandwidth_khz: 25
        notes: "Search and Rescue (SAR) operations."

assignments:
  - id: asg_airband_guard_1215
    channel_plan_id: airband_itinerant_plan
    channel_name: "Guard 121.5"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_flightwatch_1220
    channel_plan_id: airband_itinerant_plan
    channel_name: "Flight Watch 122.0"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_fss_1222
    channel_plan_id: airband_itinerant_plan
    channel_name: "FSS 122.2"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_ctaf_1227
    channel_plan_id: airband_itinerant_plan
    channel_name: "CTAF/UNICOM 122.7"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_ctaf_122725
    channel_plan_id: airband_itinerant_plan
    channel_name: "CTAF/UNICOM 122.725"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_a2a_12275
    channel_plan_id: airband_itinerant_plan
    channel_name: "Air-to-Air 122.75"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_ctaf_1228
    channel_plan_id: airband_itinerant_plan
    channel_name: "CTAF/UNICOM 122.8"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_multicom_12285
    channel_plan_id: airband_itinerant_plan
    channel_name: "MULTICOM 122.85"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_multicom_1229
    channel_plan_id: airband_itinerant_plan
    channel_name: "MULTICOM/CTAF 122.9"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_multicom_122925
    channel_plan_id: airband_itinerant_plan
    channel_name: "MULTICOM 122.925"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_ctaf_12295
    channel_plan_id: airband_itinerant_plan
    channel_name: "CTAF/UNICOM 122.95"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_unicom_122975
    channel_plan_id: airband_itinerant_plan
    channel_name: "UNICOM 122.975"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_ctaf_1230
    channel_plan_id: airband_itinerant_plan
    channel_name: "CTAF/UNICOM 123.0"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_heli_a2a_123025
    channel_plan_id: airband_itinerant_plan
    channel_name: "Heli Air-to-Air 123.025"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_ctaf_12305
    channel_plan_id: airband_itinerant_plan
    channel_name: "CTAF/UNICOM 123.05"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_ctaf_123075
    channel_plan_id: airband_itinerant_plan
    channel_name: "CTAF/UNICOM 123.075"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation
  - id: asg_airband_sar_1231
    channel_plan_id: airband_itinerant_plan
    channel_name: "SAR 123.1"
    usage: "receive-only"
    service: aviation
    authorization_id: auth_rx_only_aviation

comments:
  - text: |
      Common and itinerant U.S. aviation airband voice frequencies for RX-only
      monitoring. Airport-specific tower/ground/ATIS/approach frequencies live in
      the regional airport system files (see systems/US/_Regional/aviation/).