Explore the latest version of the most widely used microwave design tool in the world.
Find the latest features in the Pathloss 6 continuing evolution.
Get the LatestA common Google search is: “Download IITPave Software.” Let’s break down the reality of downloading it, installation challenges, and the modern alternatives. Short answer: Not officially from the FAA or IIT anymore.
Developed by the under FAA (Federal Aviation Administration) sponsorship, IITPave is a legacy Windows-based tool for the structural design of flexible airport pavements using the layered elastic theory. It remains widely referenced in FAA Advisory Circulars (AC 150/5320-6E). Download Iitpave Software
For layered elastic analysis, WESLEA (Waterways Experiment Station) is an alternative, but also legacy. Summary: Should You Try to Download IITPave? | Approach | Feasibility | Risk | Recommendation | |----------|-------------|------|----------------| | Find old installer online | Possible | High (malware, broken) | ❌ Avoid | | Run existing copy in VM | Yes, if owned | Low | ⚠️ Only for legacy project | | Download FAARFIELD | Easy | None | ✅ Best choice | | Use other layered elastic tools | Moderate | Low | ✅ For learning/theory | Final Verdict Do not waste time searching for “Download IITPave Software.” The software is obsolete, unsupported, and will not run on modern computers without significant effort—if you can even find a clean copy. A common Google search is: “Download IITPave Software
Instead, download directly from the FAA. It’s free, safe, up-to-date, and accepted for real-world airport pavement design. If you need IITPave only to check an old design, run it inside a Windows XP virtual machine using a trusted backup copy. It remains widely referenced in FAA Advisory Circulars
If you’re a pavement engineer, civil engineering student, or researcher working on airport and highway pavement design , you have almost certainly heard of IITPave .
For pavement engineering in 2025 and beyond, leave IITPave where it belongs: in the history books (and maybe a VM for nostalgia). Drop a comment below.
| Software | Platform | Notes | |----------|----------|-------| | | Windows (DOS-era) | Classic, but needs emulation. | | ElSym5 | Windows GUI | Good for teaching layered elastic theory. | | Cirly | Web/Java | Lightweight online layered analysis. | | Pavement ME (AASHTOWare) | Windows | For highways (not airports). |
Pathloss 5.1, April 29, 2024 update is now available Pathloss 5.1 - Revision history. Please refer to your original license email for the link to update.
These step by step tutorials are intended to help a first time user get the program up and running.
Pathloss 5 - Where to Begin
Pathloss 5 - Import Sites from a Text File
Pathloss 5 - Import Links from a Text File
Pathloss 5 - Understanding Pathloss 5 options and settings
Pathloss 5 Technical documents
These sections contains help concerning installation, maintennace and other operational issues.
Pathloss 5 - Installation and Maintenance (Opens as a PDF file)
Pathloss 5 - Changes in Interface from Pathloss 4
Pathloss 5 - Known Issues
Sources and instructions for using terrain data with Pathloss 5.1
For over 30 years we have been developing and refining the Pathloss program. Beginning with Version 1.4 in the late 1980s, Pathloss was quickly adopted by Equipment Manufactures, Telecommunications, Coordination and Engineering Service Providers worldwide.