O campo de observações, também chamado de campo ITEM 18 em planos de vôo da ICAO, pode levar muitas informações que o piloto julgue necessárias para que os controladores ou autoridades conheçam seu vôo IFR.
A lista de itens possíveis em um campo de ITEM 18 do plano de vôo da ICAO está disponível na Skybrary , mas aqui estão alguns exemplos que são comumente usados:
(c) “TYP/” followed by type(s) of aircraft, proceeded if necessary by number(s) of aircraft, if “ZZZZ” is inserted in Item 9
Example: TYP/2 DE HAVILLAND HERON. Up to 60 characters may be used.
(e) “ALTN/” followed by the name of alternate aerodrome(s) or bearing and distance to navaid/navigation point closest to alternate point, if “ZZZZ” is inserted in Item 16. Up to 100 characters may be used.
Example: ALTN/MEDIUM AIRPORT
(k) “OPR/” followed by name of the operator, if not obvious from the aircraft identification in Item 7.
Example: OPR/BIG COMPANY
(o) “RMK/” followed by any other, plain language, remarks when required by the appropriate ATS authority or deemed necessary. There is no limit in number of characters to be used.
Example:RMK/TRAINING ILS APPROACH AT SMALL AIRPORT
RMK/STUDENT SOLO FLIGHT