24

The reality is that the 777X is not all that different from the 777 when considering cockpit procedures or 'user interface'. What is different is the hardware platform(s) that are used. I worked for a supplier to Boeing for the 787. The stated goals for the 787 from Boeing were fairly straightforward. The design shall require a maximum of 5 days ...


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 ...


8

Hindsight is 20/20. At that time, nobody could be sure the ETOPS rule would be extended the way it eventually was. The 1985 extension was a gift from the FAA to Boeing, so US carriers could use the Boeing 767 for transatlantic services. The 1989 extension to 180 minutes allowed them to cover all domestic routes with a single type when before they needed ...


8

Not quite sure this is the actual reason, but you have to consider why they keep things the same (or not). There are two main reasons I can see: Pilots type certification. A pilot certified on a given "type" can fly any plane of that type, with (sometimes) just a little bit of additional training to cover the (supposedly) few differences between various ...


7

Correct on both guesses to some extent I would say. The airplane is pretty light, and with flaps down the flapped area of the wing is operating at a positive AOA (remember that the chord line is from the LE of the slat to the TE of the flap, so with flap down there is positive AOA even while 3 point). Also as it's an initial test flight I wouldn't be ...


5

I'll answer based on the one precedent I'm aware of. Yes. But whether the manufacturer agrees is up to them. In 1996 Saudia ordered 29 MD-90s with MD-11-style cockpits from Honeywell, including the overhead panel. Which Honeywell then supplied for the MD-95 (later renamed Boeing 717) as well. From Honeywell's press release: Saudi Arabian Airlines (Saudia) ...


5

The aircraft accident was caused by ice accumulating in the Fuel Oil Heat Exchanger (FOHE) of the Rolls-Royce Trent 800 engines which subsequently blocked fuel flow to the engines. The official accident investigation concluded: The investigation identified the following probable causal factors that led to the fuel flow restrictions: Accreted ice ...


5

Boeing's officially stated reason in the report is: ... to prevent pilots from inadvertently activating TO/GA mode at or after touchdown. Inadvertent activation of TO/GA could result, among other things, in the aircraft departing[1] the runway. ... [1] As in runway overrun/excursion. Which is in accordance with AC120-29A (also from the report), where: ...


4

Yes, Boeing applied for an amendment to the existing 777 type certificate: On April 19, 2017 (for the Model 777-8 airplane), and May 12, 2015 (for the 777-9 airplane), Boeing applied for an amendment to Type Certificate (TC) No. T00001SE to include the new Model 777-8 and 777-9 airplanes. These airplanes are constructed with new carbon-fiber-reinforced ...


4

This is an indirect answer at best, but I think you'll get something good out of it. I would definitely recommend you have look at CuriousMarc's series on YouTube where he and a couple other SMEs restore an original Apollo Guidance Computer to working order. You might think "that's not civil aviation, why?", but the AGC was the first digital fly-by-wire ...


2

From the Data I could find, including in the first answer, back at the time the A340 was developed- the standard for ETOPS was 120 minutes, thus making it more profitable to fly a 4 engine aircraft which didn't have to conform with ETOPS rules on shorter routes. The 777 was introduced a bit later, making it the first airliner to make an entry to Early ETOPS- ...


2

While the 777X is a derivation from the older 777 Classic family of airplanes, it is, in fact a brand new airplane, similar to the difference between the 747-8 and the 747 Classic line or the F/A-18E/F Super Hornet compared with the F/A-18A-D series. Based on that and the rollout date of the 777X, it would be BCA’s latest airplane.


1

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=...


1

Is not possible to order a B777 with 787 flight deck style but... it's possible to order a B777x, that is developed exactly with this kind of flight deck. In this other question this fact is highlighted, and if you want to see how is a B777x flight deck, you can see this video.


1

This is possible. Aside from the question of how the new cockpit elements would fit into the older plane, the most important factors are how it affects performance and safety in the eyes of the regulators, and whether this is worth doing from a cost point of view. A large transport aircraft has a Type Certificate (TC) from the regulator that oversees its ...


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