ASIT / Modules

ASIT Modules

7 purpose-built modules covering every major aeronautical surface type.

Obstacle Limitation Surfaces
OLS
ICAO Annex 14
Obstacle Limitation Surfaces

Creates and evaluates all ICAO Annex 14 OLS for any aerodrome. Automatic obstacle detection.

Surfaces
  • Conical & outer horizontal
  • Take-off climb surface
  • Approach (simple & stepped)
  • Transitional surfaces
  • Inner horizontal, approach & transitional
Features
  • Declared distances (LDA, TORA, TODA, ASDA)
  • Multiple runways & thresholds
  • ICAO categories 1–4
  • PDF report & KML export
  • Batch upload via CSV
Non-Precision Approach Surfaces
RNP APCH
ICAO PANS-OPS
Non-Precision Approach Surfaces

Obstacle clearance surfaces for non-precision RNP APCH (LNAV) procedures per ICAO Doc 8168 Vol II.

Segments
  • Intermediate approach
  • Final approach (LNAV)
  • Straight missed approach
  • OCA/H per segment
Outputs
  • OCA/H calculation
  • OAS infringement table
  • Professional PDF report
  • KML export
Obstacle Assessment Surfaces
OAS
ILS & APV-Baro
Obstacle Assessment Surfaces

OAS for ILS (CAT I, II, III) and APV-Baro (LNAV/VNAV). Determines OCA/H for final and missed approach.

Procedure Types
  • ILS CAT I
  • ILS CAT II
  • ILS CAT III
  • APV-Baro (LNAV/VNAV)
Outputs
  • OAS W, X, Y, Z surfaces
  • OCA/H per aircraft category
  • Missed approach OAS
  • PDF technical report
Obstacle Free & Evaluation Surfaces
OFS/OES
ICAO 2030 — Mandatory
Obstacle Free & Evaluation Surfaces

Update to the latest ICAO OLS modification — mandatory by 2030. OFS and OES replace traditional OLS.

Surfaces
  • Obstacle Free Surfaces (OFS)
  • Obstacle Evaluation Surfaces (OES)
  • Comparison vs current OLS
  • Regulatory transition analysis
Outputs
  • Gap identification vs current OLS
  • 2030 compliance report
  • Mitigation recommendations
  • Authority documentation
Visual Segment & Obstacle Clearance Surfaces
VSS/OCS
Instrument Procedures
Visual Segment & Obstacle Clearance Surfaces

VSS and OCS for instrument approach procedures. Guarantees clearance during the visual and initial approach phases.

Surfaces
  • Visual Segment Surface (VSS)
  • Obstacle Clearance Surface (OCS)
  • ILS, VOR, NDB, GNSS
  • RNP APCH procedures
Outputs
  • Visual clearance calculation
  • Infringement detection
  • PDF technical report
  • KML / GIS export
Building Restrictive Areas
BRA
ICAO Euro Doc 015
Building Restrictive Areas

Omnidirectional BRA for navaids per ICAO Euro Doc 015. Construction restrictions around VOR, DME, NDB and ILS.

Navaids
  • VOR / DVOR (omnidirectional)
  • DME / TACAN
  • NDB / Locator
  • ILS — Localizer & Glide Slope
Outputs
  • Critical & sensitive zones
  • Construction impact analysis
  • Euro Doc 015 compliance report
  • KML / GIS export
Custom
Any surface
Custom Surface Upload

Upload and evaluate any custom-defined protection surface — national surfaces, bespoke clearances, any non-standard requirement.

Input Formats
  • KML geometry upload
  • DXF geometry upload
  • Parametric surface definition
  • Combine with standard OLS
Use Cases
  • National / non-ICAO surfaces
  • Bespoke height clearances
  • Development planning studies
  • Regulatory authority requirements
Embeddable Widget

Built for Authorities.
Ready to Deploy.

Are you a Civil Aviation Authority, Airport Operator, or Municipal Planning Department? Transition from manual bureaucracy to automated safety — define your protection surfaces and empower your stakeholders with an embeddable obstacle analysis widget.

No download required
No login required
Free surface generation & analysis
Experience the Speed — Try it Live
1
Select AirportSelect an airport from the dropdown — e.g. London Heathrow (EGLL).
2
Place Your ObstacleClick on the map or enter coordinates. Terrain elevation is auto-filled.
3
Enter Altitude & RunAdd your obstacle height above ground to the terrain elevation, then press Run Analysis.
4
Get Your ResultInstant result — clear or violation — with limiting surface, margin and downloadable PDF.
Authority Plan Includes
  • Embeddable widget with your own airport surfaces
  • Official branded PDF reports with your authority logo
  • Public "Verified Authority" badge on the ASIT directory
  • Full audit log of every evaluation requested
  • Fast 2D analysis — no 3D engine or heavy download
Obstacle Clearance Check — ASIT

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