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Addressing of Position Reports
6.3.10 Position reports for aircraft operating on tracks through successive points on the mutual
boundary of two OCAs (e.g. when routing along the 45ºN parallel), should be made to both relevant OACs.
(In practice this only requires an addition to the address. (e.g. “Shanwick copy Santa Maria”.)
6.4 “WHEN ABLE HIGHER” (WAH) REPORTS
6.4.1 Prior advice to ATC of the time or position that a flight will be able to accept the next higher
level can assist ATC in ensuring optimal usage of available altitudes. A WAH Report must be provided by
all flights entering the MNPS Airspace portion of the New York OCA and entering the Santa Maria OCA.
Due to the higher number of step climb requests on the generally longer NAT route segments that transit
New York and Santa Maria OCAs and also because of the greater frequency of crossing traffic situations
here, the strategy of issuing “coast-out to coast-in” conflict free clearances is not always employed by these
two oceanic control centres. More tactical traffic control is often exercised. The provision of WAH Reports
in these circumstances allows the controllers to more effectively utilise their airspace and provide aircraft
more fuel efficient profiles. Provision of WAH Reports on entering other NAT OCAs is optional or they
may be requested by any OAC.
6.4.2 When required or when otherwise provided, upon entering an oceanic FIR, pilots should
include in the initial position report the time or location that the flight will be able to accept the next higher
altitude. The report may include more than one altitude if that information is available.
Example: ”Global Air 543, 40 North 040 West at 1010, Flight Level 350,
Estimating 40 North 050 West at 1110, 40 North 060 West Next.
Able Flight Level 360 at 1035, Able Flight Level 370 at 1145,
Able Flight Level 390 at 1300”
6.4.3 Information thus provided of the aircraft’s future altitude “ability” will not automatically be
interpreted by ATC as an advance “request” for a step climb. It will be used as previously indicated to assist
ATC in planning airspace utilisation. However, should the pilot wish to register a request for one or more
future step climbs, this may be incorporated in the WAH report by appropriately substituting the word
“Request” for the word “Able”.
NORTH ATLANTIC MNPSA OPERATIONS MANUAL CHAPTER 6
NAT MNPS 31 Edition 2005
Example: “Global Air 543, 42 North 040 West at 1215, Flight Level 330,
Estimating 40 North 050 West at 1310, 38 North 060 West Next.
Request Flight Level 340 at 1235, Able Flight Level 350 at 1325,
Request Flight Level 360 at 1415”
6.4.4 Although optimal use of the WAH reports is in conjunction with a Position Report, a
WAH report can be made or updated separately at any time.
Example: “Global Air 543, Able Flight Level 360 at 1035, Request Flight Level 370
at 1145, Able Flight Level 390 at 1300”
6.4.5 It should be noted that ATC acknowledgement of a WAH report (and any included
requests) is NOT a clearance to change altitude.
6.5 METEOROLOGICAL REPORTS
6.5.1 Some aircraft flying in the NAT are required to report MET observations of wind speed and
direction plus outside air temperature. Any turbulence encountered should be included in these reports.
From among the aircraft intending to operate on the organised track system, OACs designate those which
will be required to report routine meteorological observations at, and midway between, each prescribed
reporting point. The designation is made by the OAC when issuing the Oceanic Clearance using the phrase
“SEND MET REPORTS“, and is normally made so as to designate one aircraft per track at approximately
hourly intervals. Pilots flying routes which are partly or wholly off the OTS should include routine MET
observations with every prescribed report. The midpoint observation should be recorded then transmitted at
the next designated reporting point. The format to be used for the reporting of such additional observations
must be by reference to the latitude (degrees and minutes) and longitude (degrees only) for the intermediate
mid-point. It should be recognised that the use of the term “MID” is insufficient for direct input into MET
computers.
6.5.2 When a ground unit establishes an event contract with an aircraft to provide ADS position
reports, it may also establish an additional periodic report contract (e.g. with a 30 mins interval). Such ADS
periodic reports, unlike event reports, contain wind and temperature data and thereby satisfy the MET
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