ICAO Compliance
Certified Accuracy
Fly with confidence. Our system is rigorously tested and validated to meet ICAO Doc 9157 Part 4 and Annex 14 requirements for PAPI light inspection.
Regulatory Standards
Adhering to global aviation specifications
ICAO Doc 9157 Part 4
Our measurement protocols are strictly aligned with the Aerodrome Design Manual, Part 4 (Visual Aids). We verify that the Precision Approach Path Indicator (PAPI) system provides the correct visual guidance information to pilots.
Annex 14, Volume I
We validate compliance with Annex 14 specifications regarding light characteristics, including beam spread and transition angles. Our reports provide the evidence needed for aerodrome certification.
Verified Parameters
Precise measurement of all critical PAPI characteristics
- Vertical Angles
Verification of the transition angle from red to white within ±3 minutes of arc tolerance, ensuring the glide slope is correctly defined.
- Correction Values
Exact per-unit adjustment values derived from the measured angles, ready to apply in the field to bring each light back into tolerance.
- Chromaticity
Spectral analysis to confirm that the red and white signal colors fall within the strict ICAO chromaticity coordinate boundaries.
- Beam Spread
Verification of the horizontal and vertical beam coverage to ensure visibility throughout the approach zone.
- Unit Positioning
Photogrammetric verification of the lateral placement (15m ±1m) and spacing (9m) of PAPI units.
- Audit-Ready Reports
All data is compiled into a standardized format accepted by Civil Aviation Authorities worldwide.
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What ICAO Annex 14 Actually Requires of Your PAPI
The tolerances behind a PAPI protocol, what an authority looks for in the evidence, and how often the system has to be verified to stay certifiable.
JUL 22 2026
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