14 CFR 25.959
§ 25.959 Unusable fuel supply.
United States · 14 CFR — Aeronautics and Space · Status: effective
Cite this
- Citation
- 14 CFR 25.959, § 25.959 Unusable fuel supply, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/54187
- Permanent ID
ys:prov:54187@1- SHA-256
0de2d2f1af5f1092dc420f3f3ee0faae29a947c64ced0ce2ad6d819b9efc6648
The hash is SHA-256 of this version's text, with every run of whitespace collapsed to a single space and the ends trimmed. The ID always leads back here, and checking it says whether the text you cited is still the current version.
Full text
The unusable fuel quantity for each fuel tank and its fuel system components must be established at not less than the quantity at which the first evidence of engine malfunction occurs under the most adverse fuel feed condition for all intended operations and flight maneuvers involving fuel feeding from that tank. Fuel system component failures need not be considered.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.