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Aviation height NOC (AAI via NOCAS) — documents, timeline & process
R3 · Route & construction authorizations · ~45 days (indicative)
Height clearance for towers or structures near airports — required in notified areas (~20 km around aerodromes), granted online via the NOCAS portal; valid 7 years.
NOCAS registration → per-tower/section application → acceptance in 5 working days → processing (~3 weeks after acceptance).
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Statutory basis & authority
| Statutory basis | Aircraft Act 1934; GSR 751(E)/2015 height rules; Colour-Coded Zoning Maps |
|---|---|
| Authority | AAI via NOCAS portal (nocas.aai.aero) |
| Department | Airports Authority of India (NOCAS) |
| Indicative timeline | ~45 days (verify with the authority) |
| Fees | Nil |
Documents required
- WGS-84 coordinates
- Surveyed site elevation (AMSL) by authorised agency
- Structure height + site plan
- Undertakings
When is this required?
- Airport proximity (NOCAS zone): Within ~20 km of an airport (NOCAS zone)
Solarian expert note
Elevation disputes and aeronautical-study referrals cause delays; the 20 km radius extends up to ~56 km for tall structures near IFR airports.
Frequently asked questions
What is Aviation height NOC (AAI via NOCAS)?
Height clearance for towers or structures near airports — required in notified areas (~20 km around aerodromes), granted online via the NOCAS portal; valid 7 years.
How long does Aviation height NOC (AAI via NOCAS) take?
Around 45 days as an indicative planning figure. Actual timelines vary by authority workload and application quality — verify with the concerned authority.
Which authority grants Aviation height NOC (AAI via NOCAS)?
AAI via NOCAS portal (nocas.aai.aero). Department: Airports Authority of India (NOCAS).
What documents are required for Aviation height NOC (AAI via NOCAS)?
WGS-84 coordinates; Surveyed site elevation (AMSL) by authorised agency; Structure height + site plan; Undertakings.
When is Aviation height NOC (AAI via NOCAS) required?
Within ~20 km of an airport (NOCAS zone).
Related approvals in this phase
- Section 164 authorization (telegraph-authority powers)
- PTCC clearance (power–telecom coordination)
- Right of Way (RoW) compensation process
- National Highway crossing permission
See also: all approvals · glossary of terms · state roadmaps
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Indicative guidance from the RegNav knowledge base, expert-verified by Solarian. Not legal advice — always verify with the concerned authority.