What is the difference between Runway Alignment Indicator Lights (RAIL) and Sequenced Flashing Lights (SFL)?

Both of them are same in terms of flashing light.

  • $\begingroup$ From Wikipedia: "RAIL are similar to sequenced flashing lights, except that they end where the white approach light bars begin." $\endgroup$
    – Sanchises
    Jun 6 '17 at 10:32

SFL start at the decision bar. RAILs may not. The key differentiating factor is that RAILs extend beyond the centerline lights.

  • $\begingroup$ Thank you for answer. In the other words,SFL is embedded in ALS, on the other hand RAIL is outside of ALS. Is it right? $\endgroup$
    – Aviat
    Jun 6 '17 at 12:52
  • $\begingroup$ @Aviat Lol! "Hand rail" had me confused for a second. [forehead slap] $\endgroup$
    – TomMcW
    Jun 6 '17 at 13:39
  • 1
    $\begingroup$ There are RAILs and REILs. Had a instrument student get dinged on that once. $\endgroup$
    – mongo
    Jun 6 '17 at 14:19

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.