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enroute descents are routinely conducted shall also
report the conditions to the ARTCC even if it is not the
controlling facility.
d. If the receiving facility informs you that
weather reports are not required for a specific time
period, discontinue the reports. The time period
specified should not exceed the duration of the
receiving controller's tour of duty.
e. EN ROUTE. When you determine that weather
reports for an airport will not be required for a specific
time period, inform the AFSS/FSS or tower of this
determination. The time period specified should not
exceed the duration of receiving controller's tour of
duty.
REFERENCEFAAO
JO 7110.65, Para 3-10-2, Forwarding Approach Information
by Nonapproach Control Facilities.
2-6-7. DISSEMINATING WEATHER
INFORMATION
TERMINAL. Observed elements of weather information
shall be disseminated as follows:
a. General weather information, such as “large
breaks in the overcast,” “visibility lowering to the
south,” or similar statements which do not include
specific values, and any elements derived directly
from instruments, pilots, or radar may be transmitted
to pilots or other ATC facilities without consulting the
weather reporting station.
2/14/08 JO 7110.65S
Weather Information 2-6-5
b. Specific values, such as ceiling and visibility,
may be transmitted if obtained by one of the
following means:
1. You are properly certificated and acting as
official weather observer for the elements being
reported.
NOTEUSAF
controllers do not serve as official weather
observers.
2. You have obtained the information from the
official observer for the elements being reported.
3. The weather report was composed or verified
by the weather station.
4. The information is obtained from an official
Automated Weather Observation System (AWOS) or
an Automated Surface Observation System (ASOS).
c. Differences between weather elements
observed from the tower and those reported by the
weather station shall be reported to the official
observer for the element concerned.
JO 7110.65S 2/14/08
2-6-6
2/14/08 JO 7110.65S
Altimeter Settings 2-7-1
Section 7. Altimeter Settings
2-7-1. CURRENT SETTINGS
a. Current altimeter settings shall be obtained
from direct‐reading instruments or directly from
weather reporting stations.
REFERENCEFAAO
JO 7210.3, Chapter 2, Section 10, Wind/Altimeter Information.
b. If a pilot requests the altimeter setting in
millibars, ask the nearest weather reporting station
for the equivalent millibar setting.
c. USAF/USA. Use the term “Estimated Altimeter”
for altimeter settings reported or received as
estimated.
REFERENCEFAAO
JO 7110.65, Para 3-9-1, Departure Information.
FAAO JO 7110.65, Para 3-10-1, Landing Information.
FAAO JO 7110.65, Para 4-7-10, Approach Information.
2-7-2. ALTIMETER SETTING ISSUANCE
BELOW LOWEST USABLE FL
a. TERMINAL. Identify the source of an altimeter
setting when issued for a location other than the
aircraft's departure or destination airport.
b. EN ROUTE. Identify the source of all altimeter
settings when issued.
PHRASEOLOGYTHE
(facility name) (time of report if more than one hour
old) ALTIMETER (setting).
c. Issue the altimeter setting:
1. To en route aircraft at least one time while
operating in your area of jurisdiction. Issue the setting
for the nearest reporting station along the aircraft's
route of flight:
NOTE-
14 CFR Section 91.121(1) requires that the pilot set his/her
altimeter to the setting of a station along his/her route of
flight within 100 miles of the aircraft if one is available.
However, issuance of the setting of an adjacent station
during periods that a steep gradient exists will serve to
inform the pilot of the difference between the setting he/she
is using and the pressure in the local area and better enable
him/her to choose a more advantageous setting within the
limitations of 14 CFR Section 91.121.
2. TERMINAL. To all departures. Unless specifically
requested by the pilot, the altimeter setting
need not be issued to local aircraft operators who have
requested this omission in writing or to scheduled air
carriers.
REFERENCEFAAO
JO 7110.65, Para 3-9-1, Departure Information.
3. TERMINAL. To arriving aircraft on initial
contact or as soon as possible thereafter. The tower
may omit the altimeter if the aircraft is sequenced or
vectored to the airport by the approach control having
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