[Flick Lives]

However, I just looked up the airport info for SFO 29L. It has a 4-light PAPI, or at least it did if the plane didn't slide over it.

So, basically this is analogous to "calling the ball" optical system for carrier landings. Sounds like this plane did the equivalent of a ramp strike.

[justlurking]

So, basically this is analogous to "calling the ball" optical system for carrier landings.

Yes, that's correct. There are a couple of different light systems used by the FAA. In the picture you posted, the aircraft is just slightly below the glideslope, with 3 red and 1 white.

However, another poster has noted that the PAPI was NOTAMed out of service.

[Blueflag]

they used to be called VASI lights - visual approach slope indicators, but those ran linear, not lateral to the runway.

EASY to set your VFR approach, even at night.

[Jimmydee]

PAPI not working at 28L for the summer:

Q) KZOA/QLPAS/IV/BO/A/000/999/3737N12223W005
B) FROM: 13/07/06 22:19C) TO: 13/07/08 22:19 EST
E) RWY 28L PAPI U/S

Q) KZOA/QIGAS/I/NBO/A/000/999/3737N12223W005
B) FROM: 13/06/01 14:00C) TO: 13/08/22 23:59
E) ILS RWY 28L GP U/S

[wastedyears]

Is a ramp strike when a plane comes in too fast, and slams onto the deck?