(1) You must remove any PIT from service that is not in safe operating condition.

(2) You must immediately remove PITs from service that have any of the following problems, and do not return them to service until the cause of the problem has been eliminated:

(a) A leak in the fuel system;

(b) A clogged water muffler screen or other muffler part;

(c) An exhaust system that is emitting hazardous sparks or flames;

(d) A part that is hotter than its normal operating temperature thus creating a hazardous condition.