美國波音（Boeing）777 系列一直是全球最受歡迎的廣體客機之一。相較於過去使用四具引擎的747系列，777 採用雙引擎設計，不僅降低燃油消耗，也提高營運效率，因此成為許多航空公司取代 747 的重要選擇。延伸閱讀：《知識》波音747 - 人們心中永遠的空中「巨無霸」客機
1995 年，第一架 777-200 正式交付給美國聯合航空（United Airlines），開啟 777 系列的商業服務。之後波音陸續推出多款衍生機型，包括 777-200ER、777-200LR、777-300、777-300ER 以及 777F 貨機，滿足不同航空公司的需求。
隨著空中巴士（Airbus）推出 A350-900 與 A350-1000 等新世代客機，波音也在 2013 年杜拜航空展正式宣布推出 777X 系列，作為 777 家族的全面升級版本。
777X 主要延續 787 Dreamliner 的設計理念，包括複合材料機翼、新世代 GE9X 發動機，以及客艙設計。它被視為目前全球最大、最先進的雙引擎商用客機系列之一。延伸閱讀：《知識》飛機的機體材質「複合材料」成發展趨勢
777X 系列機型
777X 目前規劃三款機型，分別是 777-9、777-8 以及 777-8F 貨機。
- 777-9 是 777X 系列的旗艦機型，主要取代現有的 777-300ER。它擁有更大的機身與更高的載客量，典型兩艙等配置約可搭載 426 名旅客。機身長度達 76.7 公尺，比 747-8 的 76.3 公尺還長，成為全球機身最長的客機。最大航程約 13,500 公里。
- 777-8 則定位為超長程客機。雖然機身比 777-9 短，但航程更遠，最大航程可達 16,190公里，主要針對跨太平洋等長距離洲際航線設計。典型兩艙等配置約可搭載 395 名旅客。
- 777-8F 則是貨機版本，以 777-8 為基礎開發，目標是取代逐漸老化的 747 貨機。它最大結構酬載約 118 噸，最大航程約 8,168 公里。
搭載 GE9X 全球最大的商用航空發動機
為了搭配 777X，美國奇異公司（GE Aerospace）於 2013 年前後推出 GE9X 開發計畫。
GE9X 是目前商用航空史上尺寸最大的發動機，發動機的整體直徑比波音 737 客機的整個機身還要寬。它採用了大量 3D 列印零件，以及耐高溫陶瓷基複合材料（CMC），讓發動機在更高效率下運作。延伸閱讀：《知識》淺談3D列印應用於航太領域現況
GE9X 最大推力可達 105,000 磅，相較 GE90-115B 發動機，不僅降低約 10% 的燃油消耗，也減少碳排放，符合現代航空產業追求節能與環保的方向。延伸閱讀：《知識》飛機引擎運作原理及何謂「旁通比」？
可摺疊翼尖設計
777X 另一項重要特色，是全新的折疊式翼尖設計。為了提升燃油效率，777X 將翼展增加至71.8 公尺，更大的機翼可以提供更好的空氣動力效能。不過，大翼展也會造成部分機場無法停靠，因此波音採用了可向上收起的翼尖設計。777X 翼尖使用碳纖維複合材料打造，在降低重量的同時，也能提升結構強度。延伸閱讀：《知識》提升飛機空氣動力效能 - 飛機的翼尖小翼
美國聯邦航空管理局（FAA）針對這項新設計提出額外安全要求，包括飛行中翼尖不能改變位置、地面停放時需承受強風，以及安裝警告系統，避免飛機在翼尖尚未完全展開時起飛。
客艙系統
777X 可搭配松下航電（Panasonic Avionics）等供應商提供的機上娛樂與客艙系統，松下航電是全球主要的機上娛樂與通訊系統供應商，過去也曾為波音 787 Dreamliner 以及 747-8 提供相關設備。
777X 採用資料庫驅動的乙太網路架構，整合旅客廣播、客艙通訊、環境控制、機上娛樂以及連網服務，讓整體客艙系統更智慧化，也能提供更好的旅客體驗。
未來定位與發展
777X 的主要任務，是接替 777-300ER 的市場位置，並與空中巴士 A350-1000 競爭。它鎖定高載客量與長距離航線，例如中東往返美洲、亞洲往返歐洲等洲際航線。
777X 於 2019 年 6 月 24 日完成首次滑行測試，並在 2020 年 1 月 25 日完成首飛。原本預計較早交付，但因測試與認證進度延後，目前第一架 777X 預計於 2027 年交付給德國漢莎航空。
777X 代表波音下一世代大型客機的重要方向，結合更高效率的引擎、更先進的材料與創新的設計，將成為未來長程航空市場的重要機型。
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Boeing 777X: A New-Generation Long-Range Twin-Engine Aircraft
The Boeing 777 family has been one of the most popular wide-body aircraft series in the world. Compared with the four-engine Boeing 747, the 777 uses a twin-engine design, which reduces fuel consumption and improves operational efficiency. As a result, it became an important replacement option for many airlines operating the 747.In 1995, the first Boeing 777-200 was delivered to United Airlines, marking the beginning of the 777’s commercial service. Boeing later introduced several variants, including the 777-200ER, 777-200LR, 777-300, 777-300ER, and 777F freighter, to meet different airline requirements.
As Airbus introduced new-generation aircraft such as the A350-900 and A350-1000, Boeing officially announced the 777X program at the 2013 Dubai Airshow as a major upgrade of the 777 family.
The 777X continues many design concepts from the 787 Dreamliner, including composite wings, the next-generation GE9X engine, and an improved cabin design. It is considered one of the largest and most advanced twin-engine commercial aircraft families in the world today.
Boeing 777X Family
The 777X family currently includes three planned models: the 777-9, 777-8, and 777-8F freighter.Boeing 777-9
The 777-9 is the flagship model of the 777X family and is designed mainly to replace the existing 777-300ER. It features a larger fuselage and higher passenger capacity. In a typical two-class configuration, it can carry around 426 passengers. The aircraft has a length of 76.7 meters, making it slightly longer than the 747-8 (76.3 meters) and the longest commercial passenger aircraft in the world. Its maximum range is approximately 13,500 kilometers.
The 777-9 is the flagship model of the 777X family and is designed mainly to replace the existing 777-300ER. It features a larger fuselage and higher passenger capacity. In a typical two-class configuration, it can carry around 426 passengers. The aircraft has a length of 76.7 meters, making it slightly longer than the 747-8 (76.3 meters) and the longest commercial passenger aircraft in the world. Its maximum range is approximately 13,500 kilometers.
Boeing 777-8
The 777-8 is designed as an ultra-long-range aircraft. Although it has a shorter fuselage than the 777-9, it offers a longer range, reaching up to approximately 16,190 kilometers. It is designed for long-distance international routes, such as trans-Pacific flights. In a typical two-class configuration, it can carry around 395 passengers.
Boeing 777-8F Freighter
The 777-8F is the cargo version based on the 777-8 platform. It is designed to replace aging Boeing 747 freighters. The aircraft offers a maximum structural payload of around 118 tons and a maximum range of approximately 8,168 kilometers.
Powered by the GE9X: The World’s Largest Commercial Aircraft Engine
To support the 777X program, GE Aerospace started developing the GE9X engine around 2013. The GE9X is currently the largest commercial aircraft engine ever built. Its overall diameter is wider than the entire fuselage of a Boeing 737 aircraft.The engine uses advanced technologies, including 3D-printed components and Ceramic Matrix Composite (CMC) materials, allowing it to operate at higher temperatures with better efficiency.
The GE9X provides up to 105,000 pounds of thrust. Compared with the GE90-115B engine, it reduces fuel consumption by about 10% while also lowering carbon emissions, supporting the aviation industry’s goals for better efficiency and sustainability.
Folding Wingtip Design
Another key feature of the 777X is its innovative folding wingtip design. To improve fuel efficiency, the 777X uses a larger wingspan of 71.8 meters. A larger wing provides better aerodynamic performance and improves efficiency.However, the wider wingspan could limit airport compatibility. To solve this problem, Boeing introduced folding wingtips that can fold upward when the aircraft is on the ground.
The wingtips are made from carbon fiber composite materials, reducing weight while improving structural strength.
The Federal Aviation Administration (FAA) introduced additional safety requirements for this design, including:
Panasonic Avionics has also supplied systems for aircraft such as the Boeing 787 Dreamliner and 747-8.
The 777X uses a database-driven Ethernet-based cabin architecture that integrates:
- The wingtips must not change position during flight
- The folded wingtip structure must withstand strong winds while parked
- Warning systems must prevent takeoff if the wingtips are not fully extended
- Cabin Systems
Cabin Systems
The Boeing 777X can use in-flight entertainment and cabin systems from suppliers such as Panasonic Avionics Corporation, one of the world’s leading providers of aircraft entertainment and communication systems.Panasonic Avionics has also supplied systems for aircraft such as the Boeing 787 Dreamliner and 747-8.
The 777X uses a database-driven Ethernet-based cabin architecture that integrates:
- Passenger announcements
- Cabin communication systems
- Environmental control systems
- In-flight entertainment
- Internet connectivity services
Future Role and Development
The main mission of the 777X is to replace the market position of the 777-300ER and compete directly with the Airbus A350-1000.It targets high-capacity, long-distance routes, such as:
- Middle East–North America routes
- Asia–Europe routes
- Other long-haul international services
The 777X completed its first taxi test on June 24, 2019, and performed its first flight on January 25, 2020. The aircraft was originally expected to enter service earlier, but testing and certification delays pushed back the schedule. The first 777X delivery is currently expected in 2027 to Lufthansa.
The Boeing 777X represents an important step in Boeing’s next generation of large commercial aircraft. With more efficient engines, advanced materials, and innovative designs, it is expected to become a major aircraft in the future long-haul aviation market.
