What RSA dimensions are required for ADG-III?Explain the difference between OFA and OFZWhat is runway design code and how is it determined?Taxiway fillet design requirements for TDG-5RPZ dimensions for a C-III runway with 3/4 mile visibilityWhen is a crosswind runway justified?Runway length requirements per AC 150/5325-4BWhat are the separation standards between parallel runways?
AC
Welcome to the FAA Advisory Circular Interpreter.
I have comprehensive knowledge of key FAA Advisory Circulars used in airport planning, with deep expertise in:
• AC 150/5300-13B — Airport Design (RDC, RSA, OFA, OFZ, taxiway geometry, separations, RPZ) • AC 150/5325-4B — Runway Length Requirements (adjustment factors, fleet analysis) • AC 150/5060-5 — Airport Capacity & Delay (ASV, runway capacity) • AC 150/5070-6B — Airport Master Plans • AC 150/5190-7 — Minimum Standards for Commercial Activities • AC 150/5340-1L — Standards for Airport Markings • AC 150/5370-10H — Standard Specifications for Construction
Ask me anything about these ACs and I'll give you a direct, practical answer with the specific section or table reference. Try the quick-start questions above, or type your own question below.
🛫 Runway Length Analysis Calculator
Calculate required runway length per FAA AC 150/5325-4B. Select your critical aircraft, enter airport conditions, and get adjusted runway length with all correction factors applied.
Required Runway Length
0 ft
✈ Fleet Comparison
Compare runway requirements across your fleet mix. The driving aircraft (longest adjusted requirement) determines your minimum runway length.
📐 AC 150/5325-4B Reference Curves
For small airplanes (12,500 lbs or less), AC 150/5325-4B provides runway length curves based on airport elevation and mean daily maximum temperature. These are planning-level lengths for 75% and 95% of the small airplane fleet.
Small Airplanes — 75% Fleet
Elev (ft)
60°F
70°F
80°F
90°F
SL
2,510
2,620
2,730
2,850
2,000
2,840
2,960
3,090
3,230
4,000
3,210
3,350
3,500
3,660
6,000
3,640
3,800
3,970
4,150
Small Airplanes — 95% Fleet
Elev (ft)
60°F
70°F
80°F
90°F
SL
3,200
3,340
3,490
3,640
2,000
3,620
3,780
3,950
4,120
4,000
4,100
4,280
4,470
4,670
6,000
4,650
4,850
5,070
5,300
Source: AC 150/5325-4B, Figures 2-1 and 2-2. Values interpolated from FAA curves. For large airplanes (>12,500 lbs), use AFM performance data with elevation, temperature, gradient, and wind corrections per Chapter 3.
📚 AC 150/5300-13B Quick Reference Standards
Searchable tables of key dimensional standards from AC 150/5300-13B Airport Design. Click any row for details.
