22

If you read the details in the Federal Register, you can see that this refers to crosswind handling on the ground, not in the air: The folding wingtips and their operating mechanism must be designed for 65 knot, horizontal, ground-gust conditions in any direction as specified in § 25.415(a). Relevant design conditions must be defined using combinations of ...


17

This explanation is given here : The wing of the 777X is based upon the design of the 787’s wing. It has less of the sweep of the 787 but 10% more surface area (increased from 4,702 to 5,562 sq. ft.). The re-shaping has led to a higher lift-to-drag ratio, which(and) in turn increases usable fuel bulk from 320,863 to 350,410 lb. As a result, the type will ...


13

There's a trade-off between saving weight and improving lift-to-drag ratio. In the case of the 77X, the efficiency gain of the improved lift-to-drag ratio of the longer wing outweighs the potential weight saving of the shorter wing. In other words: the drag reduction results in more fuel savings than the weight reduction would. For long-range aircraft, it ...


6

Preface I've answered this before, but I need to revisit it with references -- I previously got one part right, but missed the real reason. As others have commented, the rationale of fitting into the wheel well is still questionable -- the A330 arrangement does not fit the bill for that reason and others, especially that during retraction it un-tilts and ...


6

The final report notes: At the time of each TAI [thermal acoustic imaging], the inspectors attributed the indication to a defect in the paint that was used during the TAI process and allowed the blade to continue the overhaul process and be returned to service. [emphasis mine] The paint being referred to is used for the inspection. Its function is to ...


4

1. Do they have the Alpha Floor or Flight Envelope protections Airbus aircraft have? The Alpha Floor protection on an Airbus overwrites the thrust setting commanded with the thrust levers to TOGA. Boeing does not do this. The autothrottles (if armed) will engage to prevent a stall, but the computer never overwrites the actual thrust lever position in the ...


3

Generally, the post you quote from does not look like a credible source. For starters, it says things like: Electrical failure shut down the Air System Cabin Pressurization Controller (ASCPC) and Air Cycle Machine (ACM) which on a Boeing 777 are all electric. Unlike most other airliners the B777 does not use engine bleed air. This is completely wrong. The ...


2

Based on the GE website, where they used a GE90-115B as a power generation unit, called the LM9000. GE cited 65,000 horsepower, which seems to scaled more reasonably when compared to the RB211 XWB https://www.ge.com/news/reports/ge-oil-gas-just-turned-worlds-largest-jet-engine-65-megawatt-power-plant?utm_source=feedburner&utm_medium=feed&utm_campaign=...


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