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Old 31st Aug 2002, 09:14
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RAT 5
 
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The post about using FLCH and it only giving +/- 1000fpm for step climbs was true for a PIP equiped B767-300 I flew. I don't know about the NG, 737 or any other type a/c.
All the ideas of how to overcome the various autoflight systems are whizz-bang, but that's not the point. Introduction of company SOP's sound good, but standardisation across the industry? I doubt it very much. Even standarsation within one company about how to cheat the a/c autoflight will not work.
I had this discussion about V/S versus FLCH for step climbs, especially in TMA's. It was stamped on by the head of training, along the lines of it being too complicated to teach the new boys. FLCH was safer and simpler. I would have thought it better to teach the corerect use of a system rather than ban it, except for non-precision approaches.

However, I still can't fathom why the AFDS can not be programmed to do this as SOP. In the Boeings the AFDS has lots of other similar possibilities:
CRZ descent
DESC NOW,
ALT ACQ mode with smooth level off.
Step climb in FLCH with PIP, but not all models.

It would not be beyond the wit of the engineers to include a ROC/ROD limit once in the ALT CAP mode. That way all type a/c in all companies would comply.

The point about being alert, in the loop and intervening is valid, but not everybody is of the same behaviour. It would seem to be such a simple technical introduction into the AFDS. When you consider all the other goodies and add-ons that have been done over the years, this one, which should go a long way to preventing another bang, would seem to have strong merits.

Anyone from BALPA, or other, technical committees out there; or anyone from the certification authorities care to comment?

And I don't want to come back as an A/T clutch on Brenoch's a/c.

Thanks for the ideas, though.
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