Airport height NOC register for Tamil Nadu

Yes. Every height clearance the Authority has issued since 1 January 2016 is a public record, and this page holds 8,670 of them for the Tamil Nadu aerodromes. Search by survey number, village, owner name or certificate number and each result shows the permissible top elevation above mean sea level, the ground level the applicant declared, the height that leaves, and the certificate itself to download.

The certificate fixes a top elevation above mean sea level, not a height above your plot. The Authority states the arithmetic itself: the maximum structure height is the permissible top elevation minus the site elevation the applicant declared. So a clearance of 444 metres AMSL on ground declared at 404 metres is 40 metres of structure, and nothing at all may project above that top elevation, including the water tank, the lift room, the parapet, an antenna or a lightning arrester.

It is strong evidence and it is not a permission. Two plots a few metres apart can carry different top elevations, because the figure depends on the exact coordinates, the ground level the applicant declared, and which obstacle limitation surface the site falls under. Read a nearby certificate as the best available indication of what the Authority is granting in that pocket, then apply for your own.

No. The certificate says so in its own conditions: it exists to keep aircraft operations safe, it is not proof of ownership, and every other statutory clearance including the planning permission is still required. A separate NOC from Defence is needed if the site falls under a defence aerodrome, and the state government has to be approached for sites near unlicensed aerodromes.

Eight years from the date the original NOC was issued, extendable to a maximum of twelve years from that same date. Each result here shows the valid-up-to date printed on the certificate and marks the ones that have run out, because an expired clearance is a record of what was once allowed, not a live permission.

The older ones, roughly 2016 to 2019, were issued as scanned paper rather than as a generated document, and a few of those scans are too poor to read a figure off with confidence. Where that happens the page says the certificate was read from a scan and leaves the figure blank rather than printing a guess. The certificate itself is still attached, so the number can be read by eye.

Because that certificate does not clear one site. A transmission line, a wind park or a metro viaduct is cleared by a single certificate covering dozens of separate structures, and the Authority sets a different permitted top elevation for each one, on the ground level declared at each one. There is no single figure for the certificate, so this page shows the range it covers and says how many structures are on it, and every structure is drawn on the map in its own place. Click the map beside your land and the result names the individual pole or tower nearest you and what it was permitted, which is the figure that concerns you. The top of a range is never a clearance for any particular spot. 566 certificates in the register are of this kind, covering 5,492 structures between them.

The Authority prints it beside the figure on a large minority of certificates, and repeats it in the conditions ("shall project above the Permissible Top Elevation of 352.1 M (Restricted)"). It does not mean zero: a certificate reading 352.1 M (Restricted) on ground declared at 306.65 M still leaves 45 metres. The certificate never defines the term, so this page reports the words exactly as printed, marks the certificate, and says to confirm the position with the aerodrome NOC desk rather than guessing at what the restriction is. 1,060 of the certificates read so far carry it.

On a handful the permissible top elevation is at or below the ground level the applicant declared, which means nothing was cleared to rise above the ground as it stands. Those are almost all structures inside an aerodrome boundary or on a runway approach: a watch tower at the beginning of runway 04 at Salem is issued 0 metres. This is arithmetic off the certificate, kept separate from the printed word "Restricted", and shown as "no height above ground" rather than as a negative figure. 96 of the certificates read so far are like this.

Because its own letter URL answers 404. A small number of clearances appear in the register with no document behind them, and this page says so rather than promising a file that will never arrive. The certificate number is still the Authority's own, so it can be quoted directly to the aerodrome NOC desk. This is checked by asking the portal, never guessed from a download that merely failed.

The 10 Tamil Nadu aerodromes that hold issued clearances (Chennai, Coimbatore, Madurai, Tiruchirappalli, Salem, Thoothukudi, Vellore, Hosur and Neyveli), plus Puducherry, whose clearance zone reaches Villupuram and Cuddalore villages. Puducherry is labelled as a Union Territory aerodrome throughout. A single site is often assessed against more than one aerodrome, and every one of them is shown with its own distance and bearing.

No, and the page will never say so. It means nothing in the published register names what you searched. The register begins on 1 January 2016, so an older clearance is simply not in it; a survey number is only searchable where the certificate printed one, which is 5,148 of 8,670 certificates; and an application still pending is not an issued NOC.

Those are cleared separately through the Standing Advisory Committee on Radio Frequency Allocation, and 27,426 of them exist around these aerodromes. The register returns no owner, no address and no coordinates for a mast, and no certificate is published, so they cannot be mapped or searched by place. What can be done is a lookup by the SACFA reference itself, which is on this page.