---
kind: "section"
citation: "14 C.F.R. § 93.307"
title: "14"
number: "93.307"
heading: "Minimum flight altitudes."
url: "https://uscodex.org/cfr/14/93.307"
---

# §93.307. Minimum flight altitudes.


Except in an emergency, or if otherwise necessary for safety of flight, or unless otherwise authorized by the responsible Flight Standards Office for a purpose listed in [§ 93.309](/cfr/14/93.309.md), no person may operate an aircraft in the Special Flight Rules Area at an altitude lower than the following:

- (a) **Minimum sector altitudes—**
  - (1) **Commercial air tours—**
    - (i) **Marble Canyon Sector.** Lees Ferry to Boundary Ridge: 6,000 feet MSL.
    - (ii) **Supai Sector.** Boundary Ridge to Supai Point: 7,500 feet MSL.
    - (iii) **Diamond Creek Sector.** Supai Point to Diamond Creek: 6,500 feet MSL.
    - (iv) **Pearce Ferry Sector.** Diamond Creek to the Grand Wash Cliffs: 5,000 feet MSL.
  - (2) **Transient and general aviation operations—**
    - (i) **Marble Canyon Sector.** Lees Ferry to Boundary Ridge: 8,000 feet MSL.
    - (ii) **Supai Sector.** Boundary Ridge to Supai Point: 10,000 feet MSL.
    - (iii) **Diamond Creek Sector.** Supai Point to Diamond Creek: 9,000 feet MSL.
    - (iv) **Pearce Ferry Sector.** Diamond Creek to the Grand Wash Cliffs: 8,000 feet MSL.
- (b) **Minimum corridor altitudes—**
  - (1) **Commercial air tours—**
    - (i) **Zuni Point Corridors.** 7,500 feet MSL.
    - (ii) **Dragon Corridor.** 7,500 feet MSL.
  - (2) **Transient and general aviation operations—**
    - (i) **Zuni Point Corridor.** 10,500 feet MSL.
    - (ii) **Dragon Corridor.** 10,500 feet MSL.
    - (iii) **Tuckup Corridor.** 10,500 feet MSL.
    - (iv) **Fossil Canyon Corridor.** 10,500 feet

## Notes

### Amendments

[Docket 28537, 61 FR 69330, Dec. 31, 1996, as amended by Amdt. 93-80, 65 FR 17742, 17743, Apr. 4, 2000; Amdt. 93-102, 83 FR 48212, Sept. 24, 2018]

### Source

Source: By Docket 28537, 61 FR 69330, Dec. 31, 1996, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 106(f), 40103, 40106, 40109, 40113, 44502, 44514, 44701, 44715, 44719, 46301.

### Amendments

[Docket 28537, 61 FR 69330, Dec. 31, 1996, as amended by Amdt. 93-80, 65 FR 17742, 17743, Apr. 4, 2000; Amdt. 93-102, 83 FR 48212, Sept. 24, 2018]