AF Form 3669: Global HF System Certification | Download PDF – U.S. Air Force personnel, communications specialists, and aviation operators working with High Frequency (HF) radio systems need to understand AF Form 3669. This official form, titled United States Air Force Global HF System Certification, documents and certifies equipment or stations for integration into the Air Force’s Global High Frequency System, now commonly known as the High Frequency Global Communications System (HFGCS).
What Is the USAF Global HF System (HFGCS)?
The High Frequency Global Communications System (HFGCS) serves as a critical, worldwide network of high-power HF stations. It provides beyond-line-of-sight command and control (C2) communications for U.S. Air Force aircraft, ships, and ground agencies when satellite or other systems are unavailable or degraded.
The system consists of multiple remote HF stations (historically around 13–15 sites) operating in the 2–30 MHz band, using single-sideband (SSB) modulation. Stations are remotely controlled from locations such as Andrews Air Force Base and Grand Forks Air Force Base. It supports voice, data, and phone patch capabilities for strategic and tactical operations, including support for bombers, tankers, airlift, and other DoD assets.
HFGCS remains an essential resilient communications backbone for the Department of Defense, particularly in contested or polar environments where SATCOM may be limited.
Purpose of AF Form 3669
AF Form 3669 formally certifies that a specific HF radio system, installation, or station meets Air Force standards for safe, reliable, and interoperable operation within the Global HF System. It ensures compliance with technical, operational, and electromagnetic compatibility requirements before the system can be used on the HFGCS network.
This certification helps maintain spectrum management, prevents interference, and guarantees that equipment performs to the standards required for global C2 missions. It is part of the broader Air Force processes for managing HF radios and the Global Communications System-HF.
Who Uses AF Form 3669?
- Air Force communications squadrons and maintenance personnel
- HF radio operators and system administrators
- Units responsible for ground stations, aircraft HF installations, or deployable HF systems
- Spectrum management and frequency authorization teams
- Contractors supporting HFGCS sustainment and antenna systems
The form is typically completed during initial installation, major modifications, periodic recertification, or when adding new equipment to the network.
Key Features and Sections of AF Form 3669
While the exact layout appears on the official PDF, AF Form 3669 generally includes blocks for:
- System identification (equipment type, model, serial number, location/station)
- Technical parameters (frequencies, power levels, modulation, antenna details)
- Certification authority signatures (certifying official, date, and approvals)
- Compliance statements referencing applicable Air Force Instructions (AFIs), technical orders, and electromagnetic interference (EMI) standards
- Test results or performance data summaries
- Remarks or limitations
The form serves as an official record that the system has been inspected, tested, and approved for HFGCS operations.
Direct Download Link (Official Source):
Download AF Form 3669 PDF
Always obtain forms from the official Air Force e-Publishing site (e-publishing.af.mil) to ensure you have the current version.
Related Air Force Guidance
AF Form 3669 supports policies outlined in instructions such as AFI 33-106 (Managing High Frequency Radios, Land Mobile Radios, and the Military Affiliate Radio System). This AFI addresses procedures for the Global Communications System-HF, including architecture, standards, and operational approvals.
Additional context comes from HFGCS program documentation, which emphasizes remote control, Automatic Link Establishment (ALE) in modernized stations (SCOPE Command), and integration with other C2 systems.
How to Complete and Submit AF Form 3669?
- Gather system technical data, test results, and configuration details.
- Verify compliance with current technical orders, spectrum management guidance, and HFGCS interface requirements.
- Complete all required blocks accurately.
- Obtain signatures from the appropriate certifying authority (typically a qualified communications or spectrum manager).
- Maintain the completed form as part of the system’s permanent records.
Units should consult their Major Command (MAJCOM) communications directorate or local spectrum management office for specific submission procedures and any updated checklists.
Why Proper HF System Certification Matters?
In an era of great power competition and potential SATCOM denial, reliable HF communications provide a crucial backup and primary capability in many theaters. Certification via AF Form 3669 ensures:
- Electromagnetic compatibility across the global network
- Operator safety and equipment reliability
- Interoperability with joint and allied forces
- Compliance with DoD frequency allocation and international regulations
Failure to properly certify systems can result in denied frequency use, operational delays, or interference issues.
Need Help with AF Form 3669 or HFGCS?
Air Force personnel should contact their unit’s communications squadron, base spectrum manager, or refer to the latest guidance on the Air Force e-Publishing portal. For HFGCS operational questions, reach out through official command channels.
Keywords: AF Form 3669, Global HF System Certification, USAF HFGCS, High Frequency Global Communications System, Air Force HF certification, AFI 33-106, download AF 3669.
This article is for informational purposes and reflects publicly available information as of 2026. Always verify the latest official form, instructions, and policies through authorized Air Force channels.
Official Form Source: Air Force e-Publishing (SAF/CIO A6).
HFGCS Background: Public DoD and open-source references on the High Frequency Global Communications System.