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; or
- (c) Corona and streamering at fuel vent outlets.
[Amdt. 27-23, 53 FR 34212, Sept. 2, 1988]