Guidance concerning Air Navigation in and above the NAT MNPSA
Following the oblique stroke insert one of the following letters to describe the serviceable SSR equipment carried:
N A C I
Nil; Transponder – Mode A – 4096 Codes; Transponder – Mode A – 4096 Codes and Mode C;
Transponder – Mode S with aircraft identification transmission but without pressure altitude transmission;
Transponder – Mode S with pressure altitude transmission but without aircraft identification transmission;
Transponder – Mode S with both aircraft identification and pressure altitude transmission;
Transponder – Mode S without pressure altitude transmission and without aircraft
Note: Aircraft capable of establishing ADS contracts should indicate this by the use of the additional letter D, regardless of whether the capability represents the ICAO SARPS-compliant ATN-based version or a FANS-1/A implementation.
The filing of correct and complete NAV codes in Fields 10 and 18 is important. Within the NAT Region some procedures and separation standards employed by ATC depend upon ATC's knowledge of the equipage and/or the approval status of individual aircraft/crew. The following errors in completing these fields have been noted. These errors create difficulties for ATC and can result in unnecessary penalties or unachieved benefits for the flights involved.
The filing of only a "G" or "I" rather than filing both when the aircraft is so equipped.
The filing of equipment.
The filing of a "Z" with no further explanation and either not expanding in Field 18 or
putting information in Field 18 that is irrelevant to oceanic operations (e.g. RNP-5).
Field 13: Departure aerodrome and time
Insert the ICAO four-letter location indicator of the aerodrome of departure and, without a space, the estimated off-block time.
Note: If no location indicator has been assigned, use ZZZZ and insert in Item 18 the group DEP/ followed immediately by the name of the aerodrome.
Field 15: Route
This field starts with the initial cruising speed and level. The basic structure of the field following this group consists of a sequence of entries, each of which contains a route (or the text “DCT” to signal a direct routing) and a fix. In addition, a diagonal slash and a new speed/level group can be appended to a fix.
NAT Doc 007