An engine air start after an emergency shutdown should not be attempted unless it is ascertained that it is ________________. A recurrence of the emergency could be more serious than the first occurrence. If an engine air start is attempted and not completed, observe a ______ sec waiting period (if possible) before attempting subsequent starts. This is to allow fuel drainage from the rear nacelle thus preventing a possible nacelle fire.
Answer: safe to do so; 30 sec
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