FAA 7460-1 › Michigan ›
Building or using a crane near Six Mile (Y59)?
Six Mile in Frankfort, Michigan is a public-use heliport. Under 14 CFR 77.9, anything within 5,000 feet of it that rises above a 25:1 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 Y59 without filing?
The notice surface rises 1 foot for every 25 feet of horizontal distance from the nearest point of the heliport, starting at the heliport's elevation. Using the lowest facility elevation, 755 ft above sea level:
| Distance from heliport | Notice required above (height over 755 ft) | …which is this elevation (AMSL) |
|---|---|---|
| 250 ft | 10 ft | 765 ft |
| 500 ft | 20 ft | 775 ft |
| 1,000 ft | 40 ft | 795 ft |
| 2,000 ft | 80 ft | 835 ft |
| 3,000 ft | 120 ft | 875 ft |
| 5,000 ft | 200 ft | 955 ft |
| Beyond 5,000 ft | Only the 200-ft-above-ground rule applies (77.9(a)) | |
If your ground is lower than 755 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.
Heliport location and notice boundary
Dashed line: the 5,000-ft area where the 25:1 notice slope applies.
Filing Form 7460-1 near Y59
- 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
- Y68 — Joyfield (1 nm)
- FKS — Frankfort Dow Meml Fld (6 nm)
- 7Y2 — Thompsonville (7 nm)
- 4M0 — Lake Ann Airway Estates (13 nm)
- Y87 — William B Bolton (16 nm)
- Y88 — Green Lake (16 nm)
Source: FAA airport, runway and runway-end data (NASR cycle effective 2026/10/01). Screening only — the FAA issues determinations.