1樓：MrHeinz
因為事故機型號是747-100sr
sr代表short range（短航程）
這是波音專門為客流量大而航程不遠的日本國內航線開發的一種特殊型號，特點為非常密集的全經濟艙布局，所以單機載客量就能達到500多人
sr這樣的特殊型號在747的後續機型裡也被繼承下來，比如747-200sr，747-300sr和747-400d等，均為針對日本國內航線所設計的高載客量中短程型號
2樓：
因為機型是747SR。
以下來自wikipedia：
Responding to requests from Japanese airlines for a high-capacity aircraft to serve domestic routes between major cities, Boeing developed the 747SR as a short-range version of the 747-100 with lower fuel capacity and greater payload capability. With increased economy class seating, up to 498 passengers could be carried in early versions and more than 550 in later models. The 747SR had an economic design life objective of 52,000 flights during 20 years of operation, compared to 24,600 flights in 20 years for the standard 747.
The initial 747SR model, the 100SR, had a strengthened body structure and landing gear to accommodate the added stress accumulated from a greater number of takeoffs and landings. Extra structural support was built into the wings, fuselage, and the landing gear along with a 20 percent reduction in fuel capacity.
One of two 747-100BSR SUD models built for Japan Airlines
The initial order for the 100SR — four aircraft for Japan Air Lines (JAL, later Japan Airlines) — was announced on October 30, 1972; rollout occurred on August 3, 1973, and the first flight took place on August 31, 1973. The type was certified by the FAA on September 26, 1973, with the first delivery on the same day. The -100SR entered service with JAL, the type's sole customer, on October 7, 1973, and typically operated flights within Japan.
Seven 100SRs were built between 1973 and 1975, each with a 520,000-pound (240,000 kg) MTOW and Pratt & Whitney JT9D-7A engines derated to 43,000 pounds-force (190,000 N) of thrust.
Following the 100SR, Boeing produced the 100BSR, a 747SR variant with increased takeoff weight capability. Debuting in 1978, the 100BSR also incorporated structural modifications for a high cycle-to-flying hour ratio; a related standard 100B model debuted in 1979. The 100BSR first flew on November 3, 1978, with first delivery to All Nippon Airways (ANA) on December 21, 1978.
A total of twenty 100BSRs were produced for ANA and JAL. The 100BSR had a 600,000 lb MTOW and was powered by the same JT9D-7A or General Electric CF6-45 engines used on the 100SR. ANA operated the type on domestic Japanese routes with 455 or 456 seats until retiring its last aircraft on March 10, 2006.
In 1986, two 100BSR SUD models, featuring the stretched upper deck (SUD) of the 300, were produced for JAL. The type's maiden flight occurred on February 26, 1986, with FAA certification and first delivery on March 24, 1986. JAL operated the 100BSR SUD with 563 seats on domestic routes until their retirement in the third quarter of 2006.
While only two 100BSR SUDs were produced, in theory, standard 100Bs can be modified to the SUD certification.
Overall, twenty-nine 747SRs were built, consisting of seven 100SRs, twenty 100BSRs, and two 100BSR SUDs.
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