Editing Boeing 757 (section)

===757-200M/CB===
[[File:Nepal Airlines Boeing 757-2F8M Wedelstaedt.jpg|thumb|[[Nepal Airlines]]' sole 757-200M in 2012|alt=Side view of airliner in flight, with extended landing gear]]

The 757-200M, a convertible version capable of carrying cargo and passengers on its main deck, entered service with Royal Nepal Airlines in 1988.<ref name="757_O_D_summ" /><ref>{{Cite web |date=December 17, 1988 |title=World Airliner Census |url=http://www.flightglobal.com/pdfarchive/view/1988/1988%20-%203644.html |url-status=live |archive-url=https://web.archive.org/web/20120724000655/http://www.flightglobal.com/pdfarchive/view/1988/1988%20-%203644.html |archive-date=July 24, 2012 |access-date=April 8, 2012 |website=Flight International |page=58}}</ref> Also known as the 757-200CB (Combi),<ref name="Type_cert" /> the type retains the passenger windows and cabin doors of the 757-200, while adding a forward port-side cargo door in the manner of the 757-200PF.<ref name="b28" /> Kathmandu-based Royal Nepal Airlines, later renamed [[Nepal Airlines]], included the convertible model as part of an order for two 757s in 1986.<ref name="b28" />

Nepal Airlines ordered the 757-200M to fulfill a requirement for an aircraft that could carry mixed passenger and freight loads, and operate out of [[Tribhuvan International Airport]], with its {{convert|4400|ft|m|abbr=on}} elevation, in the foothills of the Himalayas.<ref>{{harvnb|Norris|Wagner|1998|p=146}}</ref> Patterned after convertible variants of the 737 and 747, the 757-200M can carry two to four cargo pallets on its main deck, along with 123 to 148 passengers in the remaining cabin space.<ref name="b28" /> Nepal Airlines' 757-200M, which features Rolls-Royce RB211-535E4 engines and an increased MTOW of {{convert|240000|lb|kg|abbr=on}}, was the only production example ordered.<ref name="757_O_D_summ" /><ref name="b28" /><ref name="b38" /> When cargo is carried on the main deck, the crew must include an additional dedicated, trained cargo firefighter.<ref name="Type_cert" />

In October 2010, Pemco World Air Services and Precision Conversions launched aftermarket conversion programs to modify 757-200s into 757 Combi aircraft.<ref name="pemco">{{Cite web |date=October 30, 2010 |title=Pemco launches 757-200 Combi conversation program |url=http://atwonline.com/aircraft-engines-components/news/pemco-launches-757-200-combi-conversation-program-1026 |url-status=live |archive-url=https://web.archive.org/web/20101120210406/http://atwonline.com/aircraft-engines-components/news/pemco-launches-757-200-combi-conversation-program-1026 |archive-date=November 20, 2010 |access-date=October 30, 2010 |website=Aviation Week & Space Technology}}</ref><ref name="precision">{{Cite web |last=Sobie |first=Brendan |date=October 21, 2010 |title=Precision follows Pemco in launching 757 combi conversion |url=http://www.flightglobal.com/news/articles/precision-follows-pemco-in-launching-757-combi-conversion-348774/ |url-status=live |archive-url=https://web.archive.org/web/20111229172641/http://www.flightglobal.com/news/articles/precision-follows-pemco-in-launching-757-combi-conversion-348774/ |archive-date=December 29, 2011 |access-date=April 3, 2012 |website=Flight International}}</ref> Vision Technologies Systems launched a similar program in December 2011.<ref name="vtcombi">{{Cite web |date=December 17, 2010 |title=North American Airlines and VT Systems plan conversion of Boeing 757-200 to Combi configuration |url=http://www.prnewswire.com/news-releases/north-american-airlines-and-vt-systems-plan-conversion-of-boeing-757-200-to-combi-configuration-112054419.html |url-status=live |archive-url=https://web.archive.org/web/20150704225747/http://www.prnewswire.com/news-releases/north-american-airlines-and-vt-systems-plan-conversion-of-boeing-757-200-to-combi-configuration-112054419.html |archive-date=July 4, 2015 |access-date=July 3, 2015 |publisher=Global Aviation Holdings Inc.}}</ref> All three aftermarket conversions modify the forward portion of the aircraft to provide room for up to ten cargo pallets, while leaving the remaining space to fit around 45 to 58 passenger seats.<ref name=pemco/><ref name=precision/><ref name=vtcombi/> This configuration is targeted at commercial charter flights which transport heavy equipment and personnel simultaneously.<ref name=pemco/> Customers for converted 757 Combi aircraft include the [[Air Transport Services Group]],<ref name=precision/> [[National Airlines (N8)|National Airlines]],<ref name=pemco/> and [[North American Airlines]].<ref name=vtcombi/>