As stated above for "AS REQUIRED" -
In my company, we specify that, when a SWITCH (or handle) is to be positioned, the name PRINTED ON THAT POSITION be specified when answering a check list... i.e. words such as ARM, BOTH, LOW, HIGH, PRI or SEC. It is not always "ON or OFF"...
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For landing as an example, in my 747 Classic, to the challenge "AUTO BRAKES" - the answer might be OFF, MIN, MED or MAX... The answer could not be "ON"...
Happy contrails