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During the late 1990s, Boeing considered replacement aircraft programs due to slowing sales of the 767 and 747-400.Two new aircraft were proposed. The 747X would have lengthened the 747-400 and improved efficiency, and the Sonic Cruiser would have achieved 15% higher speeds (approximately Mach 0.98) while burning fuel at the same rate as the 767. [2]
[3] [4] The MRBR is based on the analysis performed using ATA "MSG-3 Operator/Manufacturer Scheduled Maintenance Development" document (MSG-3 is for Maintenance Steering Group – 3rd Task Force). [4] The MRBR is an approved set of aircraft initial maintenance requirements as prescribed by the Appendix H to para. 25.1529 of 14 CFR part 25 ...
The GEnx was expected [when?] to produce thrust from 53,000 to 75,000 lbf (240 to 330 kN) with first tests commencing in 2006 and service entry by 2008 (delayed by 787 deliveries). Boeing predicts [when?] reduced fuel consumption of up to 20% and significantly quieter engines than current turbofans. A 66,500 lbf (296 kN) thrust version (GEnx ...
The planemaker also said a seat manufacturer sent 787 operators a service bulletin in July with inspection procedures on this issue. Three US airlines operate the 787: American, Hawaiian, and United.
Boeing said Salehpour's allegations were "inaccurate" and contrary to the findings of comprehensive testing that had found the 787 could operate safely before needing "conservative maintenance ...
For the Airbus A320neo and Boeing 737 MAX, between 52% and 57% of their value lies in their engines: this could rise to 80–90% after ten years, while new Airbus A350 or Boeing 787 engines are worth 36–40% of the aircraft. After some time the maintenance reserves exceed the aircraft lease. [31]
At the same time, Boeing is reinspecting all 787 airplanes still within the production system and must also create a plan to address the in-service fleet,” it said.
On January 16, 2013, the Federal Aviation Administration (FAA) issued an emergency airworthiness directive ordering all U.S.-based airlines to ground their Boeing 787s until yet-to-be-determined modifications were made to the electrical system to reduce the risk of the battery overheating or catching fire. [26]