"pull up" - wings level or turn away?

[fuelevaporator]

aggressive reaction is a life saver but things are never easy:

both airbus and boeing show terrain information on navigation display but there seems to be a major difference in recommended procedure - airbus wants me to turn away if "red" is clearly on one side but boeing wants me to maintain wings level...

you could argue that obstacle information could be wrong and turning decreases climb capability.

you could argue that not using all information is just stupid and so-called situational awareness could tell you maintaining wings level could be a killer...

[Clandestino]

Using situational awareness? If one were present, there wouldn't be GPWS warning. As for "data might be wrong", that's the kind of argument SSJ captain made before switching off the T2CAS blaring that aeroplane could no longer outclimb the mountain but turn away was necessary.

In hindsight, we know he was dead wrong on this one.

Basic difference between FBW Airbi and Boeing when enthusiastic pull-up is required is that in one (as long as FCS works normally) aeroplane can't be stalled no matter the pull, the other can if pilot gets overexcited.

Whether this is the factor that caused the difference between manufacturers' recommendations, anyone's guess is as good as mine.

[vilas]

fuelevaporater
The procedure does not demand wings level in all cases. Airbus instructor guide says "Wings level( or turn according to situation)". If you are in VMC and see obstacle straight ahead obviously you should turn away but if you are not able to see it then better to keep wings level to get the optimum climb.

[fuelevaporator]

in this context I'm talking about the only now acquired awareness when the terrain data are presented automatically where before pilot e.g. had weather radar display on..

and since now even man made obstacles are shown imagine trying to overclimb an isolated tower when turning away makes more sense!

[vilas]

Why would you get EGPWS Wx if there was no problem with situational awareness, unless it was false Wx.If you are in IMC, should you act based on on flawed SA. So climbing away is better option.

[alf5071h]

With EGPWS always, always, always PULL UP straight ahead.
Only with amber alerts consider manoeuvring / adjusting the flight path.

Re situation awareness; in these circumstances the understanding which comes from awareness is missing. A pop-up display of terrain cannot guarantee that correct understanding is restored, it might only add to a false impression of awareness.

In advance, consider ‘What If’, if the nav system has drifted/failed (GPS can degrade), the terrain/obstacle database is out of date, altimeter error, etc, etc. At the moment of warning there is no such thing as a false warning, you just don’t know. If such a rarity does occur then it might only be established after the event.
Pilots who believed that they knew that a warning was false suffered a fallacy of understanding, wish think, made current events fit a previous understanding. At best these people had a fright, at worse they are not available to explain otherwise. … …

Re climb performance; in most circumstances a red level pull up warning would be preceded by an amber alert at which time the aircraft should have started to manoeuvre. The time available with a red warning should normally enable a reasonably well performing aircraft to out-climb an obstacle. There are and will be a few terrain situations where the aircraft performance will be insufficient, but crews are expected to be aware of these, and plan and monitor the flight path carefully in these circumstances.

[ahramin]

If it makes sense to turn, turn. If not, don't. As already mentioned, if you get to the point where you have a PULL UP you are unlikely to be able to make sense of anything at that point, so just follow the procedure.

[alf5071h]

ahramin, slam click, the point in #6 is that an individual’s ability to make sense – of being aware, is more than likely to be degraded in a warning situation; stress / surprise severely reduces mental resources.
In addition, it could have been a poor sense / awareness which resulted in the warning. Thus why consider another an action subject to misjudgement, based on what could already be a misjudged sense of awareness, etc.
An EGPWS pull-up warning is one of a few situations in aviation where action should be taken without further thought or analysis after the recognition of the warning (others might be windshear or TCAS).

[Kefuddle]

Totally agree with Alf,

If your awareness was lacking leading to such a situation in the first place then most likely any current awareness of position must be regarded as invalid and a maximum performance climb would be the best bet.

[Kefuddle]

Apologies Slam, just felt the irrational need to add my two penneth :\