Where RVR or RVV equipment is operational, irrespective of subsequent
operation or nonoperation of navigational or visual aids for the application
of RVR/RVV as a takeoff or landing minima, furnish the values for the runway
in use in accordance with paragraph 2-8-3, Terminology.
NOTE -
Readout capability of different type/model RVR equipment varies. For
example, older equipment minimum readout value is 600 feet. Newer equipment
may have minimum readout capability as low as 100 feet. Readout value increments
also may differ. Older equipment have minimum readout increments of 200
feet. New equipment increments below 800 feet are 100 feet.
REFERENCE -
FAAO 6560.10, Runway Visual Range (RVR).
{New-98-3 Revised February 26, 1998}
FAAO 6750.24, Instrument Landing System (ILS) and Ancillary
Electronic Component Configuration &
Perf. Requirements.
2-8-2 Arrival/Departure Runway Visibility
a. Issue current touchdown RVR/RVV for the runway/s in use:
1. When prevailing visibility is 1 mile or less regardless of
the value indicated.
2. When RVR/RVV indicates a reportable value regardless of the
prevailing visibility.
NOTE -
Reportable values are: RVR 6,000 feet or less; RVV 1 1/2 miles or less.
3. When it is determined from a reliable source that the indicated
RVR value differs by more than 400 feet from the actual conditions within
the area of the transmissometer, the RVR data is not acceptable and shall
not be reported.
NOTE -
A reliable source is considered to be a certified weather observer,
automated weather observing system, air traffic controller, flight service
specialist, or pilot.
4. When the observer has reliable reports, or has otherwise
determined that the instrument values are not representative of the associated
runway, the data shall not be used.
b. Issue both midpoint and rollout RVR when the value of either
is less than 2,000 feet and the touchdown RVR is greater than the midpoint
or rollout RVR.
c. Local control shall issue the current RVR/RVV to each aircraft
prior to landing or departure in accordance with subparagraphs a and b.
a. Provide RVR/RVV information by stating the runway, the abbreviation
RVR/RVV, and the indicated value. When issued along with other weather
elements, transmit these values in the normal sequence used for weather
reporting.
EXAMPLE -
"Runway One Four RVR two thousand four hundred."
"Runway Three Two RVV three quarters."
b. When two or more RVR systems serve the runway in use, report
the indicated values for the different systems in terms of touchdown, mid,
and rollout as appropriate.
EXAMPLE -
Runway Two Two Left RVR two thousand, rollout one thousand eight hundred."
Runway Two Seven Right RVR one thousand, mid eight hundred, rollout
six hundred."
c. When there is a requirement to issue an RVR or RVV value and
a visibility condition greater or less than the reportable values of the
equipment is indicated, state the condition as "MORE THAN" or "LESS THAN"
the appropriate minimum or maximum readable value.
EXAMPLE -
"Runway Three Six RVR more than six thousand."
"Runway Niner RVR one thousand, rollout less than six hundred."
d. When a readout indicates a rapidly varying visibility condition
(1,000 feet or more for RVR; one or more reportable values for RVV), report
the current value followed by the range of visibility variance.
EXAMPLE -
"Runway Two Four RVR two thousand, variable one thousand six hundred
to three thousand."
"Runway Three One RVV three-quarters, variable one-quarter to one."
REFERENCE -
FAAO 7110.65, Furnish RVR/RVV Values, paragraph 2-8-1.