Obstruction Analysis
Airspace obstruction screening & 3D analysis — 14 CFR Part 77 · AC 150/5300-13B · TERPS (Order 8260.3G) — provenance on every value. Use it for OE/AAA (7460-1) pre-filing screening, ALP obstruction exhibits, and siting studies.
SCREENING PREVIEW — NOT AN FAA DETERMINATION · AVPLOT IS NOT AFFILIATED WITH THE FAA
Project
Structures to screen
One list, one screening run, one export set. Build it by adding structures manually, pasting/uploading CSV rows, or both — every entry is screened and exported identically (max 25).
Screening options
▸ How surfaces derive (NASR + CIFP) & what the defaults mean
Each facility’s Part 77 §77.19, AC 13B, OCS-7, and TERPS surface sets are auto-derived from FAA NASR + CIFP — approach type from coded procedures, GPA/TCH from the coded glideslope, CAT II/III from the NASR ILS category, every value cited with its cycle. Two inputs are yours, because they are procedure-specific and not machine-readable: HAT and visibility minimums. Leave them blank and AvPlot uses the conservative documented defaults (< 3/4 SM branch, HAT 250 ft) — disclosed on every run, with a materiality flag whenever the default (vs. the alternative) flips a penetration outcome.
Selects the §77.19 / AC 13B branch; supplying it stands the default and its materiality flag down.
Drives the TERPS visual-area extent (8260.3G §3-3-2.c).
Scopes the surface screening and exports only — the §77.9 notice always evaluates every scanned facility (regulatory, not user-selectable).
Published runway design inputs (optional) — design-grade §77.19 run
The auto-derived screening above always runs. Supplying published runway design inputs here additionally runs the design-grade §77.19 / AC 13B / OCS-7 obstruction pipeline (the same engine as the full obstruction analysis) on each structure’s Full report fetch — per-surface elevations, penetrations, and citations against YOUR published values instead of derived ones. Leave untouched to skip.
Sets both runway ends’ AAC, ADG, TDG, and classification (≤ 12,500 lb → Small/Utility). Visibility & approach stay manual.
Low end (near threshold)
High end (far threshold)
The horizontal/conical surfaces reference the ESTABLISHED airport elevation (14 CFR 77.19(a)). Resolution: this field → NASR by looked-up airport → max runway-end elevation (recorded as an assumption — acknowledge below).
Required for the §77.19 run (structure lat/lon convert through it). Auto-detected from the looked-up airport’s ARP; enter manually otherwise (State Plane tool).
These inputs also drive the ALP sheet DXF — generate it (and every other export) from the unified Exports row that appears with the screening results below; its sheet options live in the ALP options disclosure there.
Add at least one structure to run.