Recent comments in /f/gadgets

bouncyb0b t1_izfeumo wrote

You missed the bit where the Boeing sales people deliberately miss informed the airlines that no type conversation training was necessar, in order to increase sales. The pilots of the crashed jets had no idea that this system existed let alone how to deal with a failure of it.

Ford pinto levels of corporate competence.

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RadialSpline t1_izf8jek wrote

That’s how the 737MAX happened. Trying to extend the lifespan of a design long past when it should have been retired.

As in the 737 was designed during a time when many airports had no baggage handling equipment for loading, so it sits lower to the ground than every other extant Boeing design, which then forced them to move the engine nacelles up when they slapped in the truly massive high-bypass turbofan jets. Moving the nacelles changed flight characteristics of the plane but they put a flight control system from the military side (MCAS) on to bring the planes flight characteristics back in line with the OG 737. The MCAS system got faulty data from sensors on some flights and severely contributed to the downing of those flights. There were specific trim levels on the 737MAX that had/have more advanced troubleshooting features (that’s the safety systems locked behind a paywall of earlier posts), that the airlines of the flights that went down didn’t spring for (new cockpit setup would require that airline to send its pilots in for retraining on the new features).

This is what I pieced together working in Boeing’s fabrication division deburring and hand-finishing wing ribs and spar chords (ribs hold the upper and lower wing skins apart and the spar chords hold the wing skins to the fuselage.) Chances are if you’ve flown on any of the new 777X aircraft parts of the wings I fixed up with angle grinders and hand tools.

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anengineerandacat t1_izf54sm wrote

Higher complexity doesn't generally improve your reliability aspects though and whereas I don't know much about the 747 it's entirely possible the 4 engines aren't entirely independent.

They might share fuel-pumps per-wing, so if say something happened to fuel pump 1 out of 2 you might not have engines 1 & 2 while engines 3 & 4 are calmy doing their thing.

Less moving parts is generally always a good thing, and if it weren't a passenger aircraft potentially eliminating down to a single engine "might" be acceptable if the gliding capabilities were very good (much like some turbo-prop planes) and the risk of losing life was overall lower.

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