RTK-GNSS survey accuracy is centimetre-level, while a handheld or phone GPS is typically good to about 5 m. For an AAI NOC, that gap decides whether your data is acceptable, because AAI asks for 0.5 m elevation and 3 m position. Learn how it works in our site elevation survey for airport NOC guide. Quick […]
What Is AAI NOC and Who Needs It? (Complete India Guide 2026)
AAI NOC is the No Objection Certificate from the Airports Authority of India that confirms your building, tower or other structure will not obstruct flight paths near an airport. Whether you need one depends on your site’s distance and height, which an airport NOC survey establishes before filing. AAI NOC at a Glance Item Detail […]
AMSL Elevation Certificate for Airport NOC Explained
AMSL stands for Above Mean Sea Level. An AMSL elevation certificate is a signed document from a qualified surveyor that states the ground elevation of your site, measured against mean sea level, together with its WGS-84 coordinates. The Airports Authority of India uses these two values in NOCAS to work out how tall your structure […]
Do Solar Panels Need AAI NOC? Solar Farm Height Clearance
Solar panels need an AAI NOC only when the solar farm falls inside an airport’s safeguarding zone (up to 20 km from a VFR airport or up to 56 km from an IFR airport) and its highest point, such as tracker arrays, poles, inverter stations or evacuation towers, could cross the permitted height. Panels themselves […]
Do Mobile Towers Need Airport NOC? Rules Explained
Yes, a mobile or telecom tower needs an airport NOC (height clearance from the Airports Authority of India) if it is built within the safeguarding radius of an airport, up to 20 km from a VFR airport or up to 56 km from an IFR airport, or if its height crosses the limits set in […]
Building Height Restriction Near Airport: A Builder’s Guide
A building height restriction near airport applies to any site within 20 km of a VFR airport or 56 km of an IFR airport, measured from the Aerodrome Reference Point (ARP). Your maximum height is the Permissible Top Elevation (PTE) set by AAI minus your site’s ground elevation. You need an AAI NOC before construction […]
How to Apply for AAI NOC Online via NOCAS Portal — Step by Step
Do you need an Airport NOC for your building, tower, or telecom mast, but you don’t know where to start? You are not alone. Every year, thousands of applicants sit down at the AAI’s NOCAS portal for the first time and get stuck within minutes — wrong coordinate format, missing document, or a structure type […]
AAI NOC vs DGCA Clearance
AAI NOC vs DGCA Clearance — What’s the Difference? Ask ten people involved in construction near an Indian airport what DGCA clearance means, and you will likely get ten different answers. Some call it a separate approval. Others use it interchangeably with the AAI NOC. In reality, neither is fully correct, and this confusion causes […]
What is GSR 751(E)? Complete Guide to Airport NOC Rules in India
What is GSR 751(E)? Complete Guide to Airport NOC Rules in India [IMAGE SUGGESTION 1: Featured image — an aircraft on final approach over a city skyline with a building height clearance overlay graphic. Alt text: “GSR 751(E) airport NOC rules explained — height restriction zones around Indian airports”] Are you building anything taller than […]