Master Caution reset

[srcooke 52]

I have run the Engine fire failure a couple of times with the same result, the FO cancels the Master Caution on hearing 'Confirmed'.

 

The manual states:

 

Note: The FO will not extinguish any nuisance Master Caution warnings in this scenario when you say

CONFIRMED

[GAJ52 54]

Hi Stephen

 

I think the idea here is he will cancel the initial fire warning after saying 'confirmed' but when other warnings appear as a result of the engine fire procedure, requires you to either cancel it yourself or say "Reset Master Caution".

 

Glen

[srcooke 52]

You could be right there Glen, it just doesn't appear as part of the FO flow.

 

An omission perhaps

[Jetstream96 20]

"Note: The FO will not extinguish any nuisance Master Caution warnings in THIS scenario when you say

CONFIRMED"

 

 

I think the manual means FO normally extinguish master caution/warning except for THIS scenario. You have to check what "THIS" refers to.

[Vagabondo 23]

Initially when the engine runs down the DRIVE light will illuminate illuminating the MC. When you say CONFIRM this will clear this initial illumination even though this is not a direct indication of the an engine failure. Later, as the engine slows, the associated hydraulic EDP LOW PRESSURE light will illuminate the Mater Caution (MC) HYD and perhaps also the FLT CONT at some point. These are the additional warnings that CONFIRM will not clear as CONFIRM is intended only for the initial MC activation, hence the additional phrase RESET MASTER CAUTION. This will be relevant for Engine Failure and Engine Fire associated non-normals.

 

Other failures don't have later knock on MC activations. The EEC one however does, because after the MC is initially cleared, it will reactivate as the PM switches the other engine to ALT. So, for EEC, even though it isn't mentioned in the manual, the same logic should apply.

[Vagabondo 23]

Initially when the engine runs down the DRIVE light will illuminate illuminating the MC

Just to make that clearer. Initially when the engine runs down due to an engine failure or because you shut down the engine, the overhead panel DRIVE light will illuminate, thus activating the MC.