Building or using a crane near Mansfield Muni (1B9)?
Mansfield Muni in Mansfield, Massachusetts is a public-use airport. Under 14 CFR 77.9, anything within 20,000 feet of its runways that rises above a 100:1 slope needs FAA Form 7460-1 at least 45 days before construction. Check your exact site free.
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How tall can you build near 1B9 without filing?
The notice surface rises 1 foot for every 100 feet of horizontal distance from the nearest point of the nearest runway, starting at the runway's elevation. Using the lowest runway-end elevation, 117 ft above sea level:
| Distance from nearest runway | Notice required above (height over 117 ft) | …which is this elevation (AMSL) |
|---|---|---|
| 250 ft | 2 ft | 119 ft |
| 500 ft | 5 ft | 122 ft |
| 1,000 ft | 10 ft | 127 ft |
| 2,000 ft | 20 ft | 137 ft |
| 3,000 ft | 30 ft | 147 ft |
| 5,000 ft | 50 ft | 167 ft |
| 7,500 ft | 75 ft | 192 ft |
| 10,000 ft | 100 ft | 217 ft |
| 15,000 ft | 150 ft | 267 ft |
| 20,000 ft | 200 ft | 317 ft |
| Beyond 20,000 ft | Only the 200-ft-above-ground rule applies (77.9(a)) | |
If your ground is lower than 117 ft you can build taller by the difference; if it's higher, less. Cranes count at their maximum height. The free check above uses USGS ground elevation for your exact spot.
Runways and notice boundary
Dashed line: the 20,000-ft area where the 100:1 notice slope applies; inner line: 5,000 ft.
| Runway | Length | End elevations (ft AMSL) |
|---|---|---|
| 04/22 | 2,059 ft | 116.8 / 122.9 |
| 14/32 | 3,500 ft | 121.4 / 119 |
Filing Form 7460-1 near 1B9
- File online through the FAA's OE/AAA system at least 45 days before construction or before applying for a building permit, whichever is first. Filing is free.
- You need NAD 83 coordinates, site ground elevation, structure height above ground and above sea level.
- Construction on airport property always needs notice, whatever the height.
More: Do I need to file Form 7460-1? · Cranes and Form 7460-1
Other public-use airports nearby
- TAN — Taunton Muni/king Fld (11 nm)
- OWD — Norwood Meml (11 nm)
- 1M8 — Myricks (12 nm)
- 1B6 — Hopedale Industrial Park (15 nm)
- 28M — Cranland (16 nm)
- PYM — Plymouth Muni (22 nm)
Source: FAA airport, runway and runway-end data (NASR cycle effective 2026/10/01). Screening only — the FAA issues determinations.