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the procedures in para5-4-3, Methods, subpara a4.)
a. Consider an altitude readout valid when:
1. It varies less than 300 feet from the pilot
reported altitude, or
PHRASEOLOGY-
(If aircraft is known to be operating below the lowest
useable flight level),
SAY ALTITUDE.
or
(If aircraft is known to be operating at or above the lowest
useable flight level),
SAY FLIGHT LEVEL.
2. You receive a continuous readout from an
aircraft on the airport and the readout varies by less
than 300 feet from the field elevation, or
NOTEA
continuous readout exists only when the altitude filter
limits are set to include the field elevation.
REFERENCEFAAO
JO 7110.65, Para 5-2-23, Altitude Filters.
FAAO JO 7110.65, Para 5-14-5, Selected Altitude Limits.
FAAO JO 7210.3, Para 11-2-3, Display Data.
3. You have correlated the altitude information
in your data block with the validated information in
a data block generated in another facility (by verbally
coordinating with the other controller) and your
readout is exactly the same as the readout in the other
data block.
b. When unable to validate the readout, do not use
the Mode C altitude information for separation.
c. Whenever you observe an invalid Mode C
readout below FL 180:
1. Issue the correct altimeter setting and confirm
the pilot has accurately reported the altitude.
2/14/08 JO 7110.65S
Beacon Systems 5-2-7
PHRASEOLOGY-
(Location) ALTIMETER (appropriate altimeter), VERIFY
ALTITUDE.
2. If the altitude readout continues to be invalid:
(a) Instruct the pilot to turn off the altitudereporting
part of his/her transponder and include the
reason; and
(b) Notify the operations supervisor‐incharge
of the aircraft call sign.
PHRASEOLOGYSTOP
ALTITUDE SQUAWK. ALTITUDE DIFFERS BY
(number of feet) FEET.
d. Whenever you observe an invalid Mode C
readout at or above FL 180, unless the aircraft is
descending below Class A airspace:
1. Confirm that the pilot is using 29.92 inches of
mercury as the altimeter setting and has accurately
reported the altitude.
PHRASEOLOGYCONFIRM
USING TWO NINER NINER TWO AS YOUR
ALTIMETER SETTING.
(If aircraft is known to be operating at or above the lowest
useable flight level),
VERIFY FLIGHT LEVEL.
2. If the Mode C readout continues to be invalid:
(a) Instruct the pilot to turn off the altitudereporting
part of his/her transponder and include the
reason; and
(b) Notify the operational supervisor‐incharge
of the aircraft call sign.
PHRASEOLOGYSTOP
ALTITUDE SQUAWK. ALTITUDE DIFFERS BY
(number of feet) FEET.
e. Whenever possible, inhibit altitude readouts on
all consoles when a malfunction of the ground
equipment causes repeated invalid readouts.
5-2-18. ALTITUDE CONFIRMATIONMODE
C
Request a pilot to confirm assigned altitude on initial
contact unless:
NOTEFor
the purpose of this paragraph, “initial contact” means
a pilot's first radio contact with each sector/position.
a. The pilot states the assigned altitude, or
b. You assign a new altitude to a climbing or a
descending aircraft, or
c. The Mode C readout is valid and indicates that
the aircraft is established at the assigned altitude, or
d. TERMINAL. The aircraft was transferred to
you from another sector/position within your facility
(intrafacility).
PHRASEOLOGY-
(In level flight situations),VERIFY AT (altitude/flight
level).
(In climbing/descending situations),
(if aircraft has been assigned an altitude below the lowest
useable flight level),
VERIFY ASSIGNED ALTITUDE (altitude).
or
(If aircraft has been assigned a flight level at or above the
lowest useable flight level),
VERIFY ASSIGNED FLIGHT LEVEL (flight level).
REFERENCEFAAO
JO 7110.65, Para 5-3-3, Beacon Identification Methods.
5-2-19. ALTITUDE CONFIRMATIONNON-
MODE C
a. Request a pilot to confirm assigned altitude on
initial contact unless:
NOTEFor
the purpose of this paragraph, “initial contact” means
a pilot's first radio contact with each sector/position.
1. The pilot states the assigned altitude, or
2. You assign a new altitude to a climbing or a
descending aircraft, or
3. TERMINAL. The aircraft was transferred to
you from another sector/position within your facility
(intrafacility).
PHRASEOLOGY-
(In level flight situations),VERIFY AT (altitude/flight
level).
(In climbing/descending situations),VERIFY ASSIGNED
ALTITUDE/FLIGHT LEVEL (altitude/flight level).
　
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