Propulsion Question

[nik227]

Hello, studying for an upcoming propulsion exam but my lecturers a roaster so figured id try this. Having trouble obtaining info for:

Reasons for failure of a main engine to start
Reasons for a boiler not to start

Any help would be appreciated

[Chiefy]

same for both,,,,air fuel water? enough or little enough of each. interlocks engaged?

Expand on those themes

[nik227]

Danke