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A better question for the 'questions' forum would be to ask where the originator's belief came from.
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Whilst we (I) talk about unreliable airspeed, has anyone tried 4 degrees and 70% in cruise on the B777 in the sim? ....Like you I always used to think in terms of have 85-90 and 2 degrees as starters and I have to be honest and say even now I might still shoot for those numbers intially if I had just lost airspeed and knew for sure I had just been in S&L flight. You may be aware of this, if so apologies for boring you, but I gather the Boeing logic for their "new" numbers is if you don't know your starting point ( as in were you S&L or not when you lost data? ) 4/70 will keep you inside the envelope long enough to get the ECL actioned, but there's obviously no guarantee at all that you are going to immediately be in level flight .... |
Dropped off the tanker in the mighty Hun one night with lots of fuel. Lead asks for a block to 430. Controller approves and watches us fall out if the sky in the low forties, one by one each plane reached its exact coffin corner. Fun times, especially the descent waiting waiting for enough margin to pull a bit. Once I had to refuel from a KC-10 in the 30s (only hole in the clouds) while in a loaded A-6 with a buddy store. We had 3 A-6s and 4 A-7s in the flight. The A-7s couldn't get in the basket at all due to the speed of the heavy KC-10 and the wake turbulence. I could only get in with a running start once we were a bit lighter, and keep Mil power until I finally dropped out. I then transferred fuel to the A-7s and repeated. |
The premise of this thread is that the fundamental basis of modern commercial aviation, largely working around jet aircraft operating at high-altitude, is unsafe.
As most available statistics would suggest the opposite, I suggest the original poster needs to better justify their position before the proposition can be taken seriously. |
Dont Hang Up:
As most available statistics would suggest the opposite, I suggest the original poster needs to better justify their position before the proposition can be taken seriously. |
A colleague of mine was telling me he had a flight of one of the US majors request descent from FL390 due to receiving a warning about high Ozone levels in their vicinity. I must confess I have never received training regarding Ozone and it's possible effects on pilots.
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Academic paper here ( see para 3.4)
http://iopscience.iop.org/article/10...326/8/1/014006 No company training or procedures where I work either. |
Makes sense wiggy,
Cheers |
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