Are both manual and automatic fire suppression systems required to provide for automatic engine shutdown?
A. Yes. Section 75.1911(d) applies the requirement for automatic engine shutdown to both manual and automatic systems. Q. Does installation of the automatic engine shutdown feature required under 75.1911(d) require a field modification on permissible equipment? A. The answer to this question depends on the specifics of the machine approval. If the design is such that a field modification or extension of approval is required, mine operators should check wit the equipment manufacturers to determine whether they have applied for an extension of approval to put engine shutdowns into their safety systems. If this is the case, a field modification would not be necessary. Q. If we choose to put an automatic rather than a manual fire suppression system on a piece of light-duty equipment (which is required to have only a manual system) does the system have to meet all the requirements of an automatic system, which are more extensive than for a manual system? A. Section 75.1909(I) provides that
