Artikel 28

1. The Parties to the conflict are prohibited from using their medical aircraft to attempt to acquire any military advantage over an adverse Party. The presence of medical aircraft shall not be used in an attempt to render military objectives immune from attack.
2. Medical aircraft shall not be used to collect or transmit intelligence data and shall not carry any equipment intended for such purposes. They are prohibited from carrying any persons or cargo not included within the definition in Article 8, sub-paragraph (f). The carrying on board of the personal effects of the occupants or of equipment intended solely to facilitate navigation, communication or identification shall not be considered as prohibited.
3. Medical aircraft shall not carry any armament except smallarms and ammunition taken from the wounded, sick and shipwrecked on board and not yet handed to the proper service, and such light individual weapons as may be necessary to enable the medical personnel on board to defend themselves and the wounded, sick and shipwrecked in their charge.
4. While carrying out the flights referred to in Articles 26 and 27, medical aircraft shall not, except by prior agreement with the adverse Party, be used to search for the wounded, sick and shipwrecked.