Zipper Method at BIKF

March, 3, 2021 by

This was the first time for me controlling approach at BIKF. At first when I took, the wave just got over but another wave came in no time. For my complete session the traffic was constant.

I manually vector mostly all on base or final due to traffic requirement. The low visibility at BIKF and headwinds of more than 25kts made it more challenging and fun for me as I had to constantly work with their speeds. I saw Tajay’s EIDW classic video, “I’ll call your base”. I love to do something like that without approach someday and I did a small version using the zipper method in this session.

Scenario – 1

  • Here in the above screenshot you could see there are two planes on parallel base i.e. IceAir 451, IceAir 559.
  • The scenario happened such that IceAir 559 was following IceAir 757.
  • IceAir 559 and IceAir 757 were having 1000 feet seperation but were only having 3nm so I turned Iceair 757 base and let IceAir 559 extend a little.
  • But meanwhile IceAir 451 came near base, so I turned IceAir 451 a little early to create a parallel base for both IceAir 757 and IceAir 559.

Scenario – 2

  • Here in the initial scenario, I wanted to sequence B-KUO after Nor Shuttle 1705, followed by IceAir 688, followed by the two aircrafts on left downwind.
  • B-KUO was not following instructions due to some connection issue and it made me report B-KUO.

Now the scenario looks something like the below image.

  • So after reporting B-KUO what I did is, I did not sequence IceAir 688 after Nor Shuttle 1705.
  • Instead because vertical seperation was there I turned IceAir 752 to base.
  • Then I sequenced IceAir 688 behind IceAir 752 and following both was HL-1117 shown in the below image.

Thank you to Peter, the tower controller during this session. Thanks to everyone for watching!


Mervin Sui is a contributor for the IFATC Education Group. He is an IFATC Officer.