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4. Microphone instructions.
5. Request for report when airport is in sight.
PHRASEOLOGYTURN
LEFT/RIGHT HEADING (degrees) FOR D-F
GUIDANCE TO (name of airport, fix, or location).
WHEN A REQUEST FOR TRANSMISSION IS
RECEIVED, PRESS YOUR MICROPHONE BUTTON
FOR THE SPECIFIED NUMBER OF SECONDS
FOLLOWED BY YOUR AIRCRAFT IDENTIFICATION.
and if appropriate,
REPORT (name) AIRPORT IN SIGHT.
g. Provide pertinent information on known field
conditions and latest weather information at the
destination airport.
h. Request the pilot to transmit for specified
periods (normally 5-10 seconds), as required. The
frequency of these requests will vary depending on
such factors as wind, frequency congestion, and
distance, but should be made at least once each
minute until the pilot reports the airport in sight or the
service is terminated.
PHRASEOLOGYTRANSMIT
(number) SECONDS.
TURN LEFT/RIGHT, HEADING (degrees), or
CONTINUE HEADING (degrees).
JO 7110.10T 2/14/08
5-3-2 Direction Finder (DF) Service
i. Inform the pilot when DF service is terminated
and provide the (CTAF) frequency, if appropriate,
and the local altimeter setting.
PHRASEOLOGYD-
F ORIENTATION SERVICE TERMINATED.
COMMON TRAFFIC ADVISORY FREQUENCY
(frequency) ALTIMETER (setting).
NOTEService
may be terminated when airport is in sight, the
desired fix or location is reached, practice steers or
approaches are discontinued, etc.
j. Notify DF net when service is terminated.
5-3-3. DF FIXING BY NET
When the DF net is in operation, determine the
aircraft's position as follows:
a. Tell the pilot to transmit for 10 seconds.
b. Plot the bearings obtained from two or more
antenna sites. Inform the pilot of the aircraft's
position, and the safe altitude for orientation in that
area.
NOTEThe
ARTCC or AFSS/FSS designated as DF net control is
responsible for evaluating and plotting bearings received
from individual antenna sites.
5-3-4. DF FIXING BY ONE FACILITY
One DF facility can determine an aircraft's location
by:
a. Plotting the position from a VOR or ADF and
an observed DF bearing.
b. Time method.
1. Determine the aircraft's heading and DF
bearing.
2. Tell the pilot to turn left or right, whichever
requires the lesser amount of turn, to a heading
perpendicular to the DF bearing.
3. After turn is completed, tell the pilot to
transmit (normally 5-10 seconds). Observe the DF
bearing.
4. One minute later, request another transmission.
Determine bearing and turn aircraft toward the
DF site.
5. Divide the difference in bearings (steps 3 and
4) into 60. The result is the number of minutes the
aircraft is from the DF site.
NOTEOne
station DF fixing is based on zero winds.
EXAMPLEOriginal
bearing of 360 and aircraft heading of 200, the
pilot should be advised to turn right to a heading of 270.
Observe bearing, wait 1 minute, and observe bearing. If
the first bearing (after completion of turn) was 337 and the
second bearing was 325, a difference of 12, the aircraft is
5 minutes from the DF site.
c. Distance method.
1. Use the procedures specified in steps 1
through 4 in subpara 5-3-4b.
2. Request the aircraft's true airspeed.
3. Compute the distance by dividing the bearing
change (for 1 minute) into the airspeed figure.
EXAMPLE-
140 airspeed divided by 10 (bearing change for 1 minute)
= 14 miles from DF site.
d. After the aircraft's position is determined,
provide this information, and the safe altitude for
orientation in that area.
5-3-5. EMERGENCY DF APPROACH
PROCEDURE
a. Under emergency conditions where a standard
instrument approach cannot be executed, provide DF
guidance and instrument approach service, if
available, as follows:
1. Obtain and relay ATC clearance including
radio failure procedures.
2. Issue destination airport weather.
3. Provide guidance as specified in VFR DF
Service, para 5-3-2, except delete the VFR
requirement. To avoid large turns over the DF site, the
aircraft should be guided to pass over the DF site
established on the course that the pilot will maintain
on the outbound leg of the approach.
PHRASEOLOGYTURN
LEFT/RIGHT, HEADING (degrees) FOR D-F
GUIDANCE AND APPROACH TO THE (name)
AIRPORT. MAINTAIN (altitude specified by ATC).
WHEN A REQUEST FOR TRANSMISSION IS
RECEIVED, PRESS YOUR MICROPHONE BUTTON
FOR THE SPECIFIED NUMBER OF SECONDS
FOLLOWED BY YOUR AIRCRAFT IDENTIFICATION.
2/14/08 JO 7110.10T
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