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minimum RVR values are listed in TBL GEN 3.5-5.
TBL GEN 3.5-5
Approach Category/Minimum RVR Table
Category Visibility (RVR)
Nonprecision 2,400 feet
Category I 1,800 feet
Category II 1,200 feet
Category IIIa 700 feet
Category IIIb 150 feet
Category IIIc 0feet
13.7 Ten-minute maximum and minimum RVR
values for the designated RVR runway are reported in
the body of the aviation weather report when the
prevailing visibility is less than 1 mile and/or the RVR
is 6,000 feet or less. ATCTs report RVR when the
prevailing visibility is 1 mile or less and/or the RVR
is 6,000 feet or less.
13.8 Details on the requirements for the operational
use of RVR are contained in FAA Advisory
Circular97-1, “Runway Visual Range (RVR).”
Pilots are responsible for compliance with minimums
prescribed for their class of operations in appropriate
Federal Aviation Regulations and/or operations
specifications.
13.8.1 RVR values are also measured by forward
scatter meters mounted on 14-foot frangible
fiberglass poles. A full RVR system consists of:
13.8.1.1 Forward scatter meter with a transmitter,
receiver and associated items.
13.8.1.2 A runway light intensity monitor (RLIM).
13.8.1.3 An ambient light sensor (ALS).
13.8.1.4 A data processor unit (DPU).
13.8.1.5 A controller display (CD).
13.8.2 The forward scatter meter is mounted on a
14-foot frangible pole. Infrared light is emitted from
the transmitter and received by the receiver. Any
obscuring matter such as rain, snow, dust, fog, haze,
or smoke increases the amount of scattered light
reaching the receiver. The resulting measurement
along with inputs from the runway light intensity
monitor and the ambient light sensor are forwarded to
the DPU which calculates the proper RVR value. The
RVR values are displayed locally and remotely on
controller displays.
13.8.3 The runway light intensity monitors both the
runway edge and centerline light step settings (steps1
through 5). Centerline light step settings are used for
CAT IIIb operations. Edge light step settings are used
for CAT I, II, and IIIa operations.
13.8.4 New Generation RVRs can measure and
display RVR values down to the lowest limits of
Category IIIb operations (150 foot RVR). RVR
values are displayed in 100-foot increments and are
reported as follows:
13.8.4.1 100-foot increments for products below
800 feet.
13.8.4.2 200-foot increments for products between
800 feet and 3,000 feet.
13.8.4.3 500-foot increments for products between
3,000 feet and 6,500 feet.
13.8.4.4 25-meter increments for products below
150 meters.
13.8.4.5 50-meter increments for products between
150 meters and 800 meters.
13.8.4.6 100-meter increments for products
between 800 meters and 1,200 meters.
13.8.4.7 200-meter increments for products
between 1,200 meters and 2,000 meters.
14. Reporting of Cloud Heights
14.1 Ceiling, by definition in Federal Aviation
Regulations, and as used in Aviation Weather Reports
and Forecasts, is the height above ground (or water)
level of the lowest layer of clouds or obscuring
phenomenon that is reported as “broken,” “overcast,”
or “the vertical visibility into an obscuration.” For
example, an aerodrome forecast which reads
“BKN030” refers to heights above ground level
(AGL). An area forecast which reads “BKN030”
states that the height is above mean sea level (MSL).
See FIG GEN 3.5-23 for the Key to Routine Aviation
Weather Reports and Forecasts for the definition of
“broken,” “overcast,” and “obscuration.”
14.2 Information on cloud base height is obtained by
use of ceilometers (rotating or fixed beam), ceiling
lights, ceiling balloons, pilot reports, and observer
estimations. The systems in use by most reporting
stations are either the observer estimation or the
rotating beam ceilometer.
30 AUG 07
AIP
United States of America
GEN 3.5-34
15 MAR 07
Nineteenth Edition Federal Aviation Administration
14.3 Pilots usually report height values above mean
sea level, since they determine heights by the
altimeter. This is taken into account when disseminating
and otherwise applying information received
from pilots. (“Ceiling” heights are always above
ground level.) In reports disseminated as pilot
reports, height references are given the same as
received from pilots; that is, above mean sea level.
14.4 In area forecasts or inflight Advisories, ceilings
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