PPRuNe Forums - View Single Post - Cold temp baroVNAV - EASA language
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Old 16th Jul 2019, 20:08
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FlightDetent

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Assuming the "B" speaks of (not) using the FMS compensation function...

(B) when the temperature is within promulgated limits, the flight crew should not make compensationto the altitude at the FAF and DA/H; does not align with the logic of It should be noted that a temperature compensation by the system is applicable to the VNAV guidance and is not a substitute for the flight crew compensating for temperature effects on minimum altitudes or DA/H.

Because the combined meaning would be "you should not activate the FMS compensation function for FAF and DA/H" and supplemented with "if you did activate the FMS compensation function, be aware it is not good enough and you must manually correct minimum altitudes and DA/H." WTH?

I used to think COMPENSATION stood for FMS magic and the term CORRECTION was used for manual add-ons. But that leads to the above broken logic. On the contrary, their use of compensation in the various combinations suggests it is a generic term that stands for either of or even both.

... the temperature compensation by the system ...
... is not a substitute for the flight crew compensating for temperature effects


Then in turn the "B - ..., the flight crew should not make compensation to the altitude at the FAF and DA/H" simply means no cold corrections at all.

Correct?
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