Printed circuit board assembly for aircraft engine, and method monitoring same

There is provided an aircraft engine printed circuit board assembly generally having a functional circuit contributing to the operation of an aircraft engine. The functional circuit has a first substrate portion, a first electronic component supported by the first substrate portion, and a first electrical conductor supported by the first substrate portion and leading to the first electronic component. The aircraft engine printed circuit board assembly generally has a monitoring circuit having a second substrate portion, a second electronic component supported by the second substrate portion, a second electrical conductor supported by the second substrate portion and leading to the second electronic component, the second electrical conductor having a shorter life expectancy than the first electrical conductor, and a detector monitoring an indicator of operativeness of the second electrical conductor, in which the first electrical conductor and the second electrical conductor are both exposed to the same environment.