Editing Boeing 747 (section)

==== 747SR ====
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 {{not a typo|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 up to 550 in later models.<ref name=Boe_747_classics /> Intended for shorter routes and thus more turn arounds, 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.<ref>Jenkins 2000, p. 40.</ref> 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.<ref>Kane [https://books.google.com/books?id=nCFYdB2H05UC&pg=PA534 2004, p. 534.]</ref> Extra structural support was built into the wings, fuselage, and the landing gear along with a 20% reduction in fuel capacity.<ref>Itabashi et al. 1995, p. 155.</ref>

[[File:JA8170 B747-146SR SUD JAL Japan Airlines HND 23MAY03 (8473400794).jpg|thumb|One of the two 747-100BSR with the stretched upper deck (SUD) made for [[Japan Airlines|JAL]]]]
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.<ref name="B747_milest">[http://www.boeing.com/commercial/747family/pf/pf_milestones.html "747 Milestones."] {{webarchive|url=https://web.archive.org/web/20110524131419/http://www.boeing.com/commercial/747family/pf/pf_milestones.html |date=May 24, 2011}} ''The Boeing Company''. Retrieved: December 17, 2007.</ref> Seven -100SRs were built between 1973 and 1975, each with a {{convert|520000|lb|t|adj=on}} MTOW and [[Pratt & Whitney JT9D]]-7A engines derated to {{convert|43000|lbf|kN}} of thrust.<ref name="BowersSR">Bowers 1989, pp. 516–517.</ref>

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 20 -100BSRs were produced for ANA and JAL.<ref name="Airclaims_1995">''Airclaims Jet Programs 1995''</ref> The -100BSR had a {{Convert|600000|lb|t|abbr=out}} MTOW and was powered by the same JT9D-7A or [[General Electric CF6]]-45 engines used on the -100SR. ANA operated this variant on domestic Japanese routes with 455 or 456 seats until retiring its last aircraft in March 2006.<ref>[https://web.archive.org/web/20060302033247/http://www.japancorp.net/Article.asp?Art_ID=11620 "ANA to Retire the Boeing 747SR on March 10"] ''Japan Corporate News Network''. Retrieved: December 8, 2015.</ref>

In 1986, two -100BSR SUD models, featuring the stretched upper deck (SUD) of the -300, were produced for JAL.<ref>[http://www.airliners.net/open.file?id=0047334&size=L "Boeing 747-146B/SR/SUD aircraft"] {{webarchive |url=https://web.archive.org/web/20071215185046/http://www.airliners.net/open.file?id=0047334&size=L |date=December 15, 2007}}, ''Airliners.net''.</ref> The type's maiden flight occurred on February 26, 1986, with FAA certification and first delivery on March 24, 1986.<ref>[http://www.jal.co.jp/en/aircraft/jal/detail/747_300srb.html "JAL Aircraft Collection"]. ''Japan Airlines''. Retrieved: December 15, 2007.</ref> 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.<ref name=Airclaims_1995 /> Overall, 29 Boeing 747SRs were built.<ref name="747_O_D_summ2">[http://active.boeing.com/commercial/orders/displaystandardreport.cfm?cboCurrentModel=747&optReportType=AllModels&cboAllModel=747&ViewReportF=View+Report "747 Model Orders and Deliveries data."] {{Webarchive |url=https://web.archive.org/web/20180928195003/http://active.boeing.com/commercial/orders/displaystandardreport.cfm?cboCurrentModel=747&optReportType=AllModels&cboAllModel=747&ViewReportF=View+Report |date=September 28, 2018}} ''The Boeing Company'', April 2021. Retrieved: October 24, 2020.</ref>