777-300ER Engine anti-ice

[8che]

Guys please, no one is suggesting a non-normal check list is ignored.

With any Boeing non-normal checklist a “condition statement” and/or objective statement is first stated. It is crucial that crews read this condition statement and understand it before deciding on whether to action the rest of the check list. So many crews dive in and gloss over the condition statement.

ANTI-ICE ON

Condition : All of these occur:

1) An anti-ice selector is on
2) TAT is more than 10 degrees C
3) Ice is not detected.

This message is not relevant (on the ground) if the officially reported ATIS indicates icing conditions. TAT is not part of ground assessment. Ice detection is not enabled on the ground. This checklist is not relevant until airborne because Boeing clearly states that to make a decision on Engine anti ice selection on the ground, you must rely solely on the OAT temperature and visible moisture criteria which can only come from an approved aerodrome source. Boeings definition of icing conditions is in black and white.

What you are saying is that when in icing conditions as defined by Boeing, you will turn the engine ice protection off because the aircraft told you to ?

It has never been SOP to blindly follow a checklist. Boeing clearly state there are limitations with checklist creation and it’s use. Boeing state “ Flight crew must be aware that checklists cannot be created for all conceivable situations and are not intended to replace good judgement. In some situations, at the Captains discretion, deviation from a checklist may be needed”.

Any command course worth the name or good type rating course will demonstrate a number of scenarios where blindly following a non-normal checklist will take you down a rabbit hole to an aircraft undesired state.

The ECL was never designed to replace good crew judgment and decision making. Our industry tries to build crew competencies leading to the build up of crew resilience. Simply saying we must always follow a checklist is rather depressingly a demonstration to the contrary.