2/14/08 JO 7110.10T
Direction Finder (DF) Service 5-3-1
Section 3. Direction Finder (DF) Service
5-3-1. ACTIONS REQUIRED
When providing DF services to an aircraft in
emergency status:
a. Determine if the aircraft is in VFR or IFR
weather conditions, fuel remaining, altitude, and
heading.
b. If the aircraft is operating in IFR weather
conditions, coordinate with the appropriate control
facility.
c. Determine if the aircraft is on a flight plan. If the
aircraft is not on an IFR flight plan and is in VFR
weather conditions, advise the pilot to remain VFR.
d. Alert the DF net whenever the following
conditions exist:
1. The pilot is lost.
2. An emergency is declared.
NOTEIt
is not necessary to alert the DF net if a terminal
controller visually sights the aircraft.
5-3-2. VFR DF SERVICE
a. Provide DF service to VFR aircraft when either
of the following conditions exist:
1. The pilot requests the service.
2. You suggest the service and the pilot concurs.
b. Advise the pilot to remain VFR, and provide
local altimeter setting.
PHRASEOLOGYMAINTAIN
V-F-R AT ALL TIMES. ADVISE IF
HEADING OR ALTITUDE CHANGE IS NECESSARY TO
REMAIN V-F-R. (location) ALTIMETER (setting).
c. Obtain heading and altitude. Advise the pilot to
maintain straight and level flight and to align the
heading indicator with the magnetic compass.
PHRASEOLOGYMAINTAIN
STRAIGHT AND LEVEL FLIGHT. RESET
YOUR HEADING INDICATOR TO AGREE WITH YOUR
MAGNETIC COMPASS. AFTER YOU HAVE DONE
THIS, SAY YOUR HEADING AND ALTITUDE.
d. Determine the weather and fuel conditions.
PHRASEOLOGYWHAT
IS THE WEATHER AT YOUR ALTITUDE AND
FUEL REMAINING IN TIME?
e. Advise the pilot to maintain the same heading,
request type of navigational equipment, and airspeed.
PHRASEOLOGYCONTINUE
HEADING (degrees). WHAT TYPE OF
NAVIGATIONAL EQUIPMENT DO YOU HAVE ON
BOARD AND WHAT IS YOUR AIRSPEED?
f. While receiving the reply, determine the
bearing. After determining the aircraft's bearing,
provide DF service by informing the pilot of the
following:
1. Direction of turn.
2. Magnetic heading, spoken in three digits (do
not state the word “degrees.”) All headings will be
provided in increments of 5 degrees.
3. Nature of service.
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