ASIT / Modules

ASIT Modules for PANS-OPS Procedure Design

9 core modules plus dedicated procedure-construction sub-modules covering ICAO PANS-OPS / Doc 8168 protection-area geometry, OAS, full PBN / RNAV / RNP and conventional procedure design areas for holdings, racetrack, base-turn, 45/180 procedure turns, SIDs, en-route, STARs, approach and missed-approach procedures, plus curved aerodrome and heliport OLS approach/departure/transitional surfaces and UAS corridor protection surfaces.

Obstacle Limitation Surfaces
OLS
ICAO Annex 14
Obstacle Limitation Surfaces

Creates and evaluates ICAO Annex 14 OLS for aerodromes and heliports, including straight and curved approach, departure/take-off and transitional surfaces. Automatic obstacle detection.

Surfaces
  • Conical & outer horizontal
  • Take-off climb / departure surfaces
  • Approach (straight, stepped & curved)
  • Straight & curved transitional surfaces
  • Aerodrome & heliport OLS sets
Features
  • Declared distances (LDA, TORA, TODA, ASDA)
  • Multiple runways, thresholds & helipads
  • ICAO categories 1–4 and heliport OLS
  • 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
UAS corridor protection surfaces for drone route safeguarding
UAS
Drone corridors
UAS Corridor Protection Surfaces

Create corridor-based protection surfaces for UAS and drone-route studies, including low-level corridors, vertiport access routes, terrain screening and obstacle review.

Use Cases
  • UAS route corridors
  • Drone operation safeguarding
  • Vertiport access studies
  • Low-level obstacle screening
Outputs
  • Corridor protection polygons
  • Terrain and obstacle review
  • KML / GIS exports
  • Planning dossier support
Full PBN procedure construction module
FPD
ICAO PANS-OPS
Full PBN / RNAV / RNP & Conventional Procedure Construction

Construct and assess ICAO-compliant PBN/RNAV/RNP and conventional procedure protection areas, including conventional holdings, racetrack patterns, base turns, 45/180 procedure turns, SIDs, en-route segments, STARs, approaches and missed approaches.

Procedure Construction
  • PBN and conventional holdings/racetrack patterns
  • Conventional 45/180 turns and base turns
  • SID, STAR and en-route segments
  • Approach and missed-approach areas
Outputs
  • ICAO PANS-OPS protection areas
  • Obstacle clearance and OCA/H review
  • KML / GIS exports
  • Authority-ready PDF reports
Holding and racetrack procedure protection areas
HOLDING
PBN / Conventional
Holding & Racetrack Protection Areas

Create holding and racetrack protection areas for PBN waypoints or conventional fixes, then assess obstacles and export the resulting surfaces.

PBN holdingConventional holdingRacetrackObstacle check
Base turn procedure protection areas
BT
Base Turn
Base-Turn Protection Areas

Generate base-turn protection areas for conventional and PBN procedure design, then review obstacles against the generated geometry.

Base turnReversalPBNPANS-OPS
45/180 procedure turn protection areas
45/180
Procedure Turn
45/180 Procedure-Turn Areas

Build 45/180 reversal protection areas for conventional and PBN procedure turns, with obstacle-clearance review and exportable surfaces.

45/180Procedure turnReversalExport
PBN SID departure procedure protection areas
SID
Departure
SID & Departure Protection Areas

Build PBN SID protection for runway departure tracks, turns, transitions and en-route capture, with obstacle review against generated areas.

SIDDepartureTurn areasExport
PBN en-route procedure protection areas
ENR
En-route
PBN En-route Protection Areas

Generate en-route PBN protection for route segments, turns and waypoint transitions, with obstacle assessment against the resulting areas.

En-routePBNRoute segmentsObstacle clearance
PBN STAR arrival procedure protection areas
STAR
Arrival
STAR & Arrival Protection Areas

Create STAR arrival and terminal transition protection areas for PBN route structures, sequencing and approach connection.

STARArrivalTerminalPBN
PBN approach procedure protection areas
APCH
Approach
PBN Approach Protection Areas

Construct approach protection areas for RNP, RNAV and related PBN approach concepts, with obstacle clearance review and exportable geometry.

RNP APCHRNAVFinal approachOCA/H
Missed approach procedure protection areas
MA
Missed Approach
Missed-Approach Protection Areas

Generate missed-approach protection for climb, turn and obstacle-clearance assessment after the final approach segment.

Missed approachClimbTurnObstacle clearance
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 citizens, developers and municipal users with an embeddable obstacle analysis widget for antennas, buildings, cranes and other obstacle submissions.

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
  • Instant web analysis plus world 3D terrain checks — no heavy desktop download
Obstacle Clearance Check — ASIT
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
  • Instant web analysis plus world 3D terrain checks — no heavy desktop download

Ready to start your analysis?

No installation. No login. Start in seconds.