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(e) Deviations of less than 10 NM or
operations within COMPOSITE (NOPAC and
CEPAC) Airspace, should REMAIN at ASSIGNED
altitude. Otherwise, when the aircraft is approximately
10 NM from track, initiate an altitude change based
on the following criteria:
TBL 7-1-3
Route
Centerline/Track
Deviations
>10 NM
Altitude Change
East
000 - 179M
Left
Right
Descend 300 Feet
Climb 300 Feet
West
180-359M
Left
Right
Climb 300 Feet
Descend 300 Feet
Pilot Memory Slogan: “East right up,
West right down.”
(f) When returning to track, be at assigned
flight level when the aircraft is within approximately
10 NM of centerline.
(g) If contact was not established prior to
deviating, continue to attempt to contact ATC to
obtain a clearance. If contact was established,
continue to keep ATC advised of intentions and
obtain essential traffic information.
7-1-15. Runway Visual Range (RVR)
There are currently two configurations of RVR in the
NAS commonly identified as Taskers and New
Generation RVR. The Taskers are the existing
configuration which uses transmissometer technology.
The New Generation RVRs were deployed in
November 1994 and use forward scatter technology.
The New Generation RVRs are currently being
deployed in the NAS to replace the existing Taskers.
a. RVR values are measured by transmissometers
mounted on 14-foot towers along the runway. A full
RVR system consists of:
1. Transmissometer projector and related items.
2. Transmissometer receiver (detector) and
related items.
3. Analogue recorder.
4. Signal data converter and related items.
5. Remote digital or remote display programmer.
b. The transmissometer projector and receiver are
mounted on towers 250 feet apart. A known intensity
of light is emitted from the projector and is measured
by the receiver. Any obscuring matter such as rain,
snow, dust, fog, haze or smoke reduces the light
intensity arriving at the receiver. The resultant
intensity measurement is then converted to an RVR
value by the signal data converter. These values are
displayed by readout equipment in the associated air
traffic facility and updated approximately once every
minute for controller issuance to pilots.
c. The signal data converter receives information
on the high intensity runway edge light setting in use
(step3, 4, or 5); transmission values from the
transmissometer and the sensing of day or night
conditions. From the three data sources, the system
will compute appropriate RVR values.
d. An RVR transmissometer established on a
250foot baseline provides digital readouts to a
AIM 2/14/08
7-1-38 Meteorology
minimum of 600 feet, which are displayed in 200 foot
increments to 3,000 feet and in 500 foot increments
from 3,000 feet to a maximum value of 6,000 feet.
e. RVR values for Category IIIa operations extend
down to 700 feet RVR; however, only 600 and
800feet are reportable RVR increments. The
800RVR reportable value covers a range of 701 feet
to 900 feet and is therefore a valid minimum
indication of Category IIIa operations.
f. Approach categories with the corresponding
minimum RVR values. (See TBL 7-1-4.)
TBL 7-1-4
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 0 feet
g. 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 one 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.
h. Details on the requirements for the operational
use of RVR are contained in FAA AC 97-1, “Runway
Visual Range (RVR).” Pilots are responsible for
compliance with minimums prescribed for their class
of operations in the appropriate CFRs and/or
operations specifications.
i. RVR values are also measured by forward
scatter meters mounted on 14-foot frangible
fiberglass poles. A full RVR system consists of:
1. Forward scatter meter with a transmitter,
receiver and associated items.
2. A runway light intensity monitor (RLIM).
3. An ambient light sensor (ALS).
4. A data processor unit (DPU).
5. Controller display (CD).
j. The forward scatter meter is mounted on a
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