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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.