I recently wa following a Sid and programmed the fmc to be at 250/8000 at a specific waypoint. The fmc told me a steep descent would be coming, so I anticipated that I would need spoilers. I then realized I had the drag required message in the fms and I engaged the spoilers to flight detent. The fmc was dead accurate at making the plane be at 250/8000 at the planned waypoint, but my question is, is the yellow fmc button close to the nd supposed to light for this message? I pretty much use common sense of when I think I might need the spoilers (and sure enough the cdu is telling me I need them when I think I need them), but why doesn't the light come on like when I have other fmc messages? Is this a bug or is it supposed to be like this? (the other time it doesn't light up is when I get a descent path unacheivable message).

According to another topic in this forum, it's not a bug. It's supposed to be so. Only critical FMC messages will turn on the yellow light

According to another topic in this forum, it's not a bug. It's supposed to be so. Only critical FMC messages will turn on the yellow light

Okay thanks for the answer. That makes sense.

Don't really want to hijack the thread or anything, but... Speaking of annunciator lights: sometimes, mostly during approach, the "A/T First" yellow light flashes from time to time. No A/T disconnect. Is that normal?

Don't really want to hijack the thread or anything, but... Speaking of annunciator lights: sometimes, mostly during approach, the "A/T First" yellow light flashes from time to time. No A/T disconnect. Is that normal?

Yes this normal the "flashing" amber A/T first annunciator light is giving the pilot a speed warning when the A/T system is in MCP or FMC SPD modeThe speed warning occurs when the true airspeed is 10 knots above the target speed or 5 knots below the target speed and is not accelerating to the target speed. The flaps must be down for the warning to occur. When A/T system disconnect's you get a RED A/T first annunciator light.