CFR /  Title 14  /  Part 29  /  Sec. 29.954 Fuel system lightning protection.

The fuel system must be designed and arranged to prevent the ignition of fuel vapor within the system by--

(a) Direct lightning strikes to areas having a high probability of stroke attachment;

(b) Swept lightning strokes to areas where swept strokes are highly probable; and

(c) Corona and streamering at fuel vent outlets. [Amdt. 29-26, 53 FR 34217, Sept. 2, 1988]