в случае аварии
• A hand wheel must be provided so that supply of fuel may be shut off from deck in [(or in case, or in the event) of] an emergency.
Источник:
Русско-английский научно-технический словарь
на Gufo.me
• A hand wheel must be provided so that supply of fuel may be shut off from deck in [(or in case, or in the event) of] an emergency.