Gatwick (EGKK) SFD4Z departure SI

[PLM1995]

What is the bug/error?

With EGKK_APP, LON_S_CTR and LON_D_CTR.

Aircraft assumed by EGKK_APP flying a SFD4Z departure has its SI 'toggle' between LD and LS multiple times after departure.

Example:
EZY4EX - Flying EGKK > LFPG via SFD M605 XIDIL/N0326F190 M605 BIBAX

Initially LS, then LD, then LS, etc.:

What is the expected functionality?

SI Should remain LS, as they are top-down of TCSW in this situation.

Sources

EGKK vMATS.

File changes (if known)

Unsure.

[KHardern]

I don't think this is fixable. It does it because the TCSE/SW boundary line is west of the SFD track for about 10NM and so ES prediction switches to TCSE (LD) when the plane is climbing rapidly. (i.e. it predicts it will enter LD)

[PLM1995]

I don't think this is fixable. It does it because the TCSE/SW boundary line is west of the SFD track for about 10NM and so ES prediction switches to TCSE (LD) when the plane is climbing rapidly. (i.e. it predicts it will enter LD)

Ahhh right. Will leave this issue open a wee while longer in case anyone has some spark of genius then close it if not.

[hazzas-99]

@PLM1995 most likely to do with this change: 3130e4d

The problem with using FIX SFD is that when the aircraft is assumed by TC SW (or the controller covering it) after transfer, I believe the SFD 70 still displays in the list until the aircraft passes SFD. We could perhaps try using FIX KKS22 or D344G, but we probably need a fallback with FIX AFTER SFD in case Gatwick holds on to the aircraft for longer.

So we could maybe try:

COPX:EGKK:08R:KKS22:SFD:*:KKAPP_E:London TC SW:7000:*:^SFD
COPX:EGKK:08R:D344G:SFD:*:KKAPP_E:London TC SW:7000:*:^SFD

COPX:EGKK:08R:*:SFD:*:KKAPP_E:London TC SW:7000:*:^SFD

COPX:EGKK:08L:D344G:SFD:*:KKAPP_E:London TC SW:7000:*:^SFD

COPX:EGKK:08L:*:SFD:*:KKAPP_E:London TC SW:7000:*:^SFD

[PLM1995]

Thanks, I'll put that in and try it out.

[PLM1995]

Thanks @hazzas-99, having tried that out, in the same scenario of KKR, LS and LD; it seems to give LD initially (not toggling now with the one aircraft I tested) until it switches to LS after like 15 miles around FL70. My understanding is it should be LS from departure. (Gives TCSE initally with KKR, TCSE and TCSW until around KKS16 when is switches to TCSW). So seems to be whichever sector it's in.