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AIM

10/12/17

7

−1−38

Meteorology

priority is desired on the frequency and for ATC
response.

2.

The pilot still retains the option of initiating

the communications using the urgency call “PAN

PAN” 3 times to alert all listening parties of a special
handling condition which will receive ATC priority
for issuance of a clearance or assistance.

3.

ATC will:

(a)

Approve the deviation.

(b)

Provide vertical separation and then

approve the deviation; or

(c)

If ATC is unable to establish vertical

separation, ATC must advise the pilot that standard
separation cannot be applied; provide essential traffic
information for all affected aircraft, to the extent
practicable; and if possible, suggest a course of
action.  ATC may suggest that the pilot climb or
descend to a contingency altitude (1,000 feet above or
below that assigned if operating above FL 290;
500 feet above or below that assigned if operating at
or below FL 290).

PHRASEOLOGY

STANDARD SEPARATION NOT AVAILABLE, DEVIATE
AT PILOT’S DISCRETION; SUGGEST CLIMB (or
descent) TO (appropriate altitude); TRAFFIC (position
and altitude); REPORT DEVIATION COMPLETE.

4.

The pilot will follow the ATC advisory

altitude when approximately 10 NM from track as
well as execute the procedures detailed in para-
graph 7

−1−14c5.

5.

If contact cannot be established or revised

ATC clearance or advisory is not available and
deviation from track is required, the pilot must take
the following actions:

(a)

If possible, deviate away from an

organized track or route system.

(b)

Broadcast aircraft position and intentions

on the frequency in use, as well as on frequency
121.5 MHz at suitable intervals stating: flight
identification (operator call sign), flight level, track
code or ATS route designator, and extent of deviation
expected.

(c)

Watch for conflicting traffic both visually

and by reference to TCAS (if equipped).

(d)

Turn on aircraft exterior lights.

(e)

Deviations of less than 10 NM 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

−1−5

Route

 Centerline/Track

Deviations

>10 NM

Altitude Change

EAST

(000_−179_ 

magnetic)

LEFT

RIGHT

DESCEND 300 ft

CLIMB 300 ft

WEST

(180_−359_

magnetic)

LEFT

RIGHT

CLIMB 300 ft

DESCEND 300 ft

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 technolo-
gy. 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.

Analog

4.

 recorder.

5.

Signal data converter and related items.

6.

Remote digital or remote display program-

mer.