Did you know that the 787 can deploy a propellor underneath its fuselage?It's called a RAT.
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Many modern aircraft contain RAT. On the other hand, Boeing 737 type aircraft do not have RAT system. They are designed in a manner that pilots can manage manually in case all electrical power sources on the aircraft are exhausted.
The -8 RAT provides emergency hydraulic pressure to System 3 when manually deployed or automatically when 3 or more hydraulic systems lose >50% pressure. Hydraulic System 3 provides power to the Left Autopilot, 1/3 of the spoilers, the Upper Yaw Damper, 1/4 of the Rudder and 1/4 of the Elevator.
The aircraft has had some problems. On January 16, 2013, the FAA said that no 787s were allowed to fly in the U.S. due to batteries catching fire. Several other countries also banned the 787 from flying in their country. The problem was fixed and the airplanes returned to flight in April.
The Dreamliner is a successful aircraft, still in production with more than 1600 delivered or on order. The list price for a new Boeing 787-8 is $239 million dollars. Yet even as international travel opens again for these long-range aircraft, two Dreamliners barely ten years old are waiting for the wrecker's ball.
The FAA said the leaks could damage critical equipment and lead to a “loss of continued safe flight and landing.” The agency said one airline found wet carpet in the cockpit of a plane and, when it inspected its entire fleet of 787s, found “multiple” planes with leaking faucets.
The 787's latest problem mirrors production issues discovered over 2020 and 2021 that included improperly fitted shimming that led to paper-thin gaps between surfaces on the Dreamliner's fuselage.
This high aspect ratio wing design combined with efficiency enhancing raked wing tips allow the 787 to be one of the fastest commercial aircraft (Mach 0.85 cruise speed) while consuming less fuel than today's comparably sized aircraft.
The Boeing 737 MAX passenger airliner was grounded worldwide between March 2019 and December 2020 ? longer in many jurisdictions ? after 346 people died in two crashes: Lion Air Flight 610 on October 29, 2018 and Ethiopian Airlines Flight 302 on March 10, 2019.
The A350-900 has a 665 nautical mile advantage in range, while the 787-9 has a lighter maximum take-off weight by 62,408 pounds. The A350-900 offers more seating in a typical configuration, which we would expect to result in a lower seat-mile cost.
The longer the 787s remained on the ground, the more it would cost to get them to fly again, due to the maintenance work required. As a result, they were no longer airworthy.
Additionally, for the Boeing 747-400 and Boeing 787-8, there is an automatic aileron lockout system in place. This prevents the aircraft from performing any manoeuvres that might stress the airframe, such as a roll upside down.
The problem involves a fitting for the 787's horizontal stabilizer installed by a Boeing production facility in Salt Lake City, Utah, the company said. The horizontal stabilizer, located at the base of an aircraft's tail, allows a plane to maintain longitudinal balance while flying.
It was found that Boeing had more accidents than expected, while Airbus had fewer (p = 0.015). In terms of fatalities, Boeing had more than expected, with Airbus fewer (p < 0.001). Looking at accidents alone, only the number of fatalities was statistically significantly different.
The first is that the A380 carries double the passengers than the A340 (650 vs 380 depending on the configuration) and thus Airbus wanted to signify this in the name. Even looking at the two aircraft you can see that the A380 is essentially a double-decker A340. The second theory is that it is because of China.