Originally Posted by
Lantirn
Nice that the subject got hot.
About the "passing 10000ft unrel speed" case:
Sonicbum and vilas, your posts imply applying the memo items before going to QRH and then ECAM to do the switching or whatever the ECAM is.
What I can understand is, that when on cruise you dont apply if the safety is not affected. When on takeoff its affected, so you apply memo.
In the 10000ft scenario just using a pitch obtained from memo items, without completing the memos seems like an improvisation. And an improvisation can have some of the memos, added actions like "leveling off", switching controls (which is really big no no again if you are not sure from QRH which side is correct) , other personal techniques and then where is that red line? You can have endless personal opinions. From these posts Sonicbum implies AP/FD/ATHR off, while vilas talks about CLB 5. Respect both. Of course its a forum and I know that maybe you didnt explain by detail exactly the steps, but you got my message. Techniques can be endless but airbus procedures are specific. And the airbus procedures werent clear for me for that phase.Thats why I made the question in the beginning.
I have done a level off it in the sim by memory, but in the end I was thinking that that maybe was a bull!!!!. Unluckily my instructor didnt tell me anything.
The reason that I adopted this subconsciously was to avoid the overspeed warning from the erratic block pitot tube during further climb, which gave me the sense of a correct completion of the exercise because the overspeed warning never occured.
Now about the subject of personal pitch and power settings memorization that pilots do, I find it perfectly normal because this is what saves your day in the end. Also your colleague might also give you wrong values from the QRH, which has happened especially with new F/Os. How to use it and when to use it is what we discuss here. I think its a good habit to know soma basic values.
Lantirn,
seems like what you are looking for is a black and white answer on “I have unreliable speed at 10’000ft, what do I do?” And so on like “what about 11000, 12000, etc..”.
Airbus tells You very clearly: if the safe conduct of the flight is impacted then apply the memory items, otherwise applying the memory items is not required. You are a pilot hence you should be able to evaluate (also based on what I have described above) if the safe conduct of the flight is impacted or not, this is the reason we do still have human beings on board the airplanes. So let’s review again your scenario. In case of a partial or total blockage of a pitot tube your airspeed indicator will start over reading during a climb. How bad this is going to be depends upon how badly the pitot is blocked. It is absolutely normal to end up with several nuisances such as the overspeed warning but you don’t care as you know the airspeed is unreliable and all you care about having some parameters that will keep the acft within the envelope, such as the memo items parameters or the parameters you were flying prior to the failure if that is the case. You want to try an interesting failure to demonstrate how the system works? Next time you are in the sim ask the instructor to block the stby pitot and insert icing conditions in IMC. Keep climbing and you will get an ECAM overspeed warning out of nowhere when your PFD 1 and 2 will show normal climbing speeds, say 250 knots. In that case ADR 3 senses an overspeed due to the stby pitot blockage which will also be shown on the stby instruments. So the nuisances warnings are to be disregarded (except the stall warning) just rely on the pitch/thrust parameters. The biggest CRM training element in the unreliable speed scenario is Surprise and Startle especially when the failure doesn’t come as per textbook, and that is exactly what we must focus on as pilots.