Is considered to be one of the detainable deficiencies under the STCW Convention（）.

Absence, substantial deterioration or failure of proper operation of the cargo deck area fire protection on tanker
B. Absence, non-compliance or serious deterioration of lights, shapes or sound signal
C. Absence or failure of proper operation of the radio equipment for distress and safety communication
D. Absence in a watch of a person qualified to operate equipment essential to safe navigation, safety radio communications or the prevention of marine pollutio