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In the Chart Supplement (A/FD) for CRQ/KCRQ, you will find RVR-T for runway 24.

I was wondering what 'T' stands for?

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From page 5-1-7, contractions in the AIM:

RVRT . . . . . . . . . RVR Touchdown

The full list is:

RVR . . . . . . . . . . Runway Visual Range
RVRM . . . . . . . . RVR Midpoint
RVRR . . . . . . . . . RVR Rollout
RVRT . . . . . . . . . RVR Touchdown

On some runways there are multiple RVR sensors and different points along the runway, and these are the names given to identify the different locations.

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Runway Visual Range - Touchdown

From FAA 6560.10C

Touchdown RVR VSs are located 0 feet to 2,500 feet (0 meters to 750 meters) from the runway threshold, normally behind the instrument landing system (ILS) glide slope (G/S) antenna, precision approach path indicator (PAPI), visual approach slope indicator (VASI), or microwave landing system (MLS) elevation antenna (if applicable).

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While the other answers are correct, the dash in RVR-T is missing.

An overhaul (Interagency Air Cartographic Committee) done to the AFD makes it hard to get the up-to-date legend unless you're willing to download the full 300 MB document.

But I managed to find just the guidelines: Chart Supplement IACC 8, dated 25 April 2016.

3.1.5.3.13.11

Runway Visual Range shall be shown as RVR appended with T for touchdown, M for midpoint, and R for rollout; e.g., RVR-TMR.

It's got the dash!

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  • $\begingroup$ Haha, just like them to have two different ways of saying the same thing! $\endgroup$ – Lnafziger Aug 30 '16 at 23:25

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