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Old 02-02-2013, 10:20 PM   #1  
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Default Hard or Soft Limit Protections?

There was a thread this week about preference of Yolk vs Side Stick - which really comes down to Boeing and Airbus discussion. It got me thinking -

Which do you all prefer with regards to Protections in the FBW system? The "yolk/Boeing" system uses soft protections with limits that can be over ridden by the pilot. The "side stick/Airbus" uses hard limits which are firm and not (in normal law) designed to be superceeded by the pilot. Which is preferred? This seems like a more important or at least equally important discussion to the differences regarding comfort of the two systems.

Discuss ---
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Old 02-03-2013, 04:14 AM   #2  
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This will (undoubtedly) bring up scads of opinions, but the only ones I'd really listen to would be those who have flown both, extensively.

Since I am Boeing-only, I'd say I like knowing that the Boeing is just a big airplane, and it'll let me do what I want, albeit with a lot of squawking and/or some yoke force.
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Old 02-03-2013, 05:00 AM   #3  
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Default Chicken or Egg?

Yolk: yellow center of an egg.

Yoke: a control-wheel for an aircraft.

I've flown both. The pro-Boeing crowd often cites the ability to exceed hard-limits in emergency circumstances, such as an evasive pull-up for terrain or other aircraft. I've read, but can not confirm, that Airbus did a test for just that in the sim, by comparing the scenario in both a Boeing and Bus.

According to the story, that while the Boeing guys sometimes exceeded g/bank limits, it took them longer to achieve them. The Bus subjects could yank the stick to the limit, and achieved maximum g/bank earlier.

Result? The Bus survived more often.

I went through 777 training in 2002 but did not fly the aircraft due to being bumped-downward to the A-320. If I recall correctly, the FBW of the 777 is not significantly different from the A-320 in regards to g and bank limits. I'm certain it can't be rolled past a specific bank, but I'm less certain about g-protection.

Personally, I like the Bus, and have no problem with its control-laws.
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Old 02-03-2013, 01:34 PM   #4  
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Quote:
Originally Posted by UAL T38 Phlyer View Post
Yolk: yellow center of an egg.

Yoke: a control-wheel for an aircraft.
ROFLMAO. Yes, you are correct. I guess I should have noticed my mistake. But maybe I have been flying Airbus too long and forgot that a "yoke" actually exists. Haha
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Old 02-03-2013, 02:18 PM   #5  
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With no "yolk," does that make the Bus an "egg-beater?"

Ever since Tex Johnston rolled the 707 prototype, a Boeing big-wig (President or CEO, not sure which) has supposedly told the test pilots before the first flight of any new aircraft:

"Don't roll it."

I saw a Youtube clip where the test pilot of the 777 told him "But it can't!"

He said "Just don't roll it."
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Old 02-03-2013, 08:25 PM   #6  
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Quote:
Originally Posted by UAL T38 Phlyer View Post
Ever since Tex Johnston rolled the 707 prototype, a Boeing big-wig (President or CEO, not sure which) has supposedly told the test pilots before the first flight of any new aircraft:

"Don't roll it."
I heard that when the "Boeing big-wig" saw Tex do it and became agitated, a General standing next to him said: "Relax -- I think he just sold your airplane."
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