A regulação aqui parece ser 14 CFR 61.57 (c) (1). A maneira que o regulamento é escrito, podemos ver que existem três requisitos distintos:
(1) Use of an airplane, powered-lift, helicopter, or airship for maintaining instrument experience. Within the 6 calendar months preceding the month of the flight, that person performed and logged at least the following tasks and iterations in an airplane, powered-lift, helicopter, or airship, as appropriate, for the instrument rating privileges to be maintained in actual weather conditions, or under simulated conditions using a view-limiting device that involves having performed the following -
(i) Six instrument approaches.
(ii) Holding procedures and tasks.
(iii) Intercepting and tracking courses through the use of navigational electronic systems.
Portanto, não é "uma combinação do acima que totaliza 6" e não é 6 de cada. São 6 do primeiro e qualquer quantidade dos dois outros.