14 CFR §450.163

1. (a)Lightning hazard mitigation. An operator must—
   1. (1)Establish flight commit criteria that mitigate the potential for a launch or reentry vehicle intercepting or initiating a direct lightning strike, or encountering a nearby discharge, using a means of compliance accepted by the Administrator; or
   2. (2)Use a vehicle designed to protect safety-critical systems in the event of a direct lightning strike or nearby discharge.
2. (b)Application requirements.
   1. (1)An applicant electing to comply with paragraph (a)(1) of this section must submit flight commit criteria that mitigate the potential for a launch or reentry vehicle intercepting or initiating a direct lightning strike, or encountering a nearby lightning discharge.
   2. (2)An applicant electing to comply with paragraph (a)(2) of this section must submit documentation providing evidence that the vehicle is designed to protect safety-critical systems against the effects of a direct lightning strike or nearby discharge.