Which colors on a glideslope indicate a good approach?

Which colors on a glideslope indicate a good approach?

• A. Green with the glidepath needle centered
• B. Red with the needle deflected
• C. Blue bars perfectly vertical
• D. Yellow flags indicating a warning

Answer: (A)

Reading the glideslope is about vertical guidance: green together with the glidepath needle centered means you’re exactly on the published glide slope and in the proper vertical position for a stable approach. This combination shows the signal is valid and you’re tracking the intended descent path toward the runway, which is what you want during the approach. If the indicator is red with the needle deflected, you’re off the glide path or the signal is unreliable, which isn’t suitable for a normal approach. Blue bars that are perfectly vertical aren’t the standard cue for being on path, since blue isn’t the usual color coding for a normal on-glide-slope indication. Yellow flags indicate a warning or that the glideslope is not available, so that setup isn’t a good sign for a standard, safe approach.

Reading the glideslope is about vertical guidance: green together with the glidepath needle centered means you’re exactly on the published glide slope and in the proper vertical position for a stable approach. This combination shows the signal is valid and you’re tracking the intended descent path toward the runway, which is what you want during the approach.

If the indicator is red with the needle deflected, you’re off the glide path or the signal is unreliable, which isn’t suitable for a normal approach. Blue bars that are perfectly vertical aren’t the standard cue for being on path, since blue isn’t the usual color coding for a normal on-glide-slope indication. Yellow flags indicate a warning or that the glideslope is not available, so that setup isn’t a good sign for a standard, safe approach.