Section 3. Operations
OF SIGMETs, CWAs, AND PIREPs
CWSU meteorologist is the focal point for the review of SIGMETs to
determine application to the ARTCC area of responsibility and may
issue a CWA to modify or redefine the SIGMET information.
CWSU meteorologist may also issue a CWA in advance of a SIGMET when
the observed or the expected weather conditions meet SIGMET criteria
or when conditions do not meet SIGMET criteria but are considered
weather coordinator (WC) has the primary responsibility for the inter/intrafacility
dissemination of SIGMETs and CWAs and must ensure that sufficient
information is disseminated to facilitate the required alert
ATC facilities must relay the SIGMET and the CWA information to towers
under their jurisdiction.
WC is the focal point for handling PIREP requests and for the
dissemination of Urgent PIREPs within the ARTCC and to the terminal
ATC facilities without LSAS which are or may be affected.
CWSU meteorologist solicits PIREPs through the weather coordinator or
directly from the controllers when required. Both solicited and
unsolicited PIREPs that meet the Urgent PIREP criteria will be
distributed immediately via the Leased Service A System (LSAS).
classification: Categorize PIREPs as follows:
Weather phenomena reported by a pilot which represents a hazard or a
potential hazard to flight operations. Disseminate reports of the
following conditions as URGENT PIREPs:
funnel clouds, or waterspouts.
or extreme turbulence (including clear air turbulence).
level wind shear.
Defined as wind shear within 2,000 feet of the surface.
eruptions and volcanic ash clouds.
other weather phenomena reported which are considered by the
specialist as being hazardous or potentially hazardous to flight
Classify as ROUTINE all PIREPs received except those listed above.
OF NOTAM DATA
traffic managers must coordinate with other air traffic facilities in
their area to ensure that adequate procedures are established for the
receipt and distribution of NOTAMs.
6-3-3. DF NET CONTROL
The FSS in
whose area the DF service is requested must have full responsibility
for all DF activities until the aircraft has been located or has
passed into an adjacent FSSs flight plan area; then, responsibility
must be transferred to the receiving FSS. DF Net control facilities
must be assigned by the En Route and Oceanic Operations Area Office
Director. DF Net control must not be assigned to FSS facilities, until
such time as a telephone system, equal to or better than the ARTCC
system, is fully operational to appropriate adjacent facilities.
maximum assistance to the aircraft in distress. Priority should be
given to establishing radar contact with an aircraft in distress. When
an aircraft directly contacts a DF facility and requests assistance,
that facility must:
with the appropriate radar facility to establish radar contact by
using code 7700 or a discrete beacon code assigned by the radar
any necessary assistance to the aircraft and coordinate with the
appropriate control facility when radar contact cannot be established.
b. When requested by the DF Facility, the
ARTCC must function as a relay agent to assist in alerting and for
coordination between control facilities and DF locations.
ARTCCs acting as relay agents may become necessary due to line outages
or other direct communication disruption between DF facilities.
control facilities must alert DF facilities that might be able to
provide service whenever radar contact cannot be established and one
of the following conditions exist:
pilot becomes lost or disoriented.
emergency is declared.
DF facilities that might be able to provide service should still be
alerted as a backup method of assistance, especially if loss of radar
contact or loss of transponder is a concern.
ARTCC may request assistance from military aircraft to provide UHF/VHF
DF bearing information. However, the aircraft commander retains the
prerogative as to the availability of this service.
DF operations will normally be conducted on emergency frequency 121.5
MHz. If the aircraft in distress is unable to utilize 121.5 MHz, a
discrete frequency may be used. Also, discrete frequencies should be
used for practice DFs.
must be the responsibility of DF stations to maintain a satisfactory
level of operator proficiency. DF stations must devise forms to
satisfactorily record incidents of navigational assistance provided to
aircraft, DF training activities, and for recording inoperable status.
Voice recordings of DF service to aircraft must be as prescribed for
normal ATC requirements at each DF facility.
magnetic radials are used in planning airways/routes, conversion to
true radials is required for designation. The final magnetic radials
are not determined until the airspace action is charted. As a result,
differences from planned magnetic radials may occur in the conversion
of true to magnetic radials. Differences may also occur later due to
changes in the magnetic variation, which is recomputed every 5 years.
These differences could contribute to the misapplication of the VFR
altitude hemispheric rule. Therefore, ARTCC air traffic managers must
conduct a continuing review of the airway and jet route structures and
proposed new airspace cases and bring any differences to the attention
of the En Route and Oceanic Operations Service Area Office.
traffic managers must furnish personnel assigned Flight Data duties a
copy of FAAO JO 7110.10, Flight Service, and ensure they are
familiar with it.
6-3-6. MTR (IR)
AND CHANGES TO PUBLISHED MOA ACTIVITY SCHEDULES
must use the procedures as outlined in FAAO JO 7110.10, Flight
Services, para 6-5-1 for forwarding these schedules or changes via
Facilities may develop procedures for forwarding these scheduled
MTR/MOA via the GI message provided the “all” option is not utilized
and there is no adverse impact on computer processing.
message(s) containing these schedules must be forwarded not more than
24 hours in advance of confirmation of the planned activity.
message must only contain the following and be formatted as per FAAO
JO 7110.10, Flight Services, para 6-5-1:
name of the MTR or MOA.
scheduled use times.
(MOA-only if different from published periods).
(MOA-only if different from published altitudes).