Questions tagged [redundancy]

For questions about the use of multiple similar components to keep a single failure from being catastrophic.

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How reliable is keeping flight maps on an iPad in the cockpit? [duplicate]

Are flight maps no longer kept on a shelf in the cockpit as a back up in case the iPads malfunction? One story that I managed to research highlighted that this was under debate to rely only on a ...
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4answers
142 views

Why don't nonrigid airships have multiple gas cells?

Nonrigid airships (blimps) differ from rigids and most semirigids in having the entire envelope form a single large gas chamber, rather than dividing the lifting gas among several redundant gas cells. ...
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1answer
157 views

What kind of flight-control redundancy does the Tu-204 have?

The Russian Tupolev Tu-204 and variants are reported to be digital fly-by-wire. Are they quadruplex redundant? Do they have manual or analog back-up systems?
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2answers
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Why is not every airplane equipped with 3 angle-of-attack sensors?

For critical systems, redundancy is built into the system. It is common knowledge among designers/architects to have three different inputs so in case one is faulty, input from the remaining two can ...
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2answers
262 views

Why don't aircraft carriers have multiple sets of arresting wires?

On this answer to this question regarding the merits of angled flightdecks on aircraft carriers, @JanHudec makes this interesting observation: You don't really have "two flight decks". The ...
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1answer
183 views

Why does the DHC-6 have only one set of elevator cables?

Air Moorea Flight 1121 crashed because its up-elevator cable broke, allowing the elevator to blow to its faired position and thus be unavailable to counteract the pitch-down moment caused by the flaps ...
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3answers
235 views

Can horizontal stabilizer trim be worked independently (each side)?

I notice most jetliners have a big trim wheel on each side of the center console. This wheel is black with white stripes, and notably turns on its own via the autopilot. Two large trim wheels: And ...
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1answer
2k views

What is the difference between redundancy and fault tolerance?

What is the difference between redundancy and fault tolerance in the context of aviation ?
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3answers
10k views

How dissimilar are redundant flight control computers?

Facts On Airbus aircraft there are computers to secure the flight envelope, or to move the control surfaces. FADECs totally control the engines. Computers take decisions in place of the pilots, or ...
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5answers
3k views

What alternative methods are there for controlling a plane when flight control surfaces have failed?

I saw a TV show once about Japan Airlines flight 123, in which the aft pressure bulkhead ruptured, disabling hydraulics and ripping off the vertical stabiliser. So the flight crashed after some time ...