The presence of radioactive material on board of a civil aircraft is permitted, provided

1. The presence of radioactive substances on board of an aircraft is strictly prohibited
2. Granting the license by the Ministry of Environmental Protection
3. The proper packaging and clear labeling of radioactive material
4. ✓That the substances are required to operate the major aircraft systemsCorrect answer

Explanation

While dangerous goods are generally restricted, exceptions exist for materials that are an integral part of the aircraft's operation or certification.

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