StacksVerified U.S. regulatory reference

14 CFR §25.867

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Surfaces to the rear of the nacelles, within one nacelle diameter of the nacelle centerline, must be at least fire-resistant.
  2. (b)Paragraph (a) of this section does not apply to tail surfaces to the rear of the nacelles that could not be readily affected by heat, flames, or sparks coming from a designated fire zone or engine compartment of any nacelle.