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href="https://de.wikipedia.org/wiki/Learjet_28" title="Learjet 28 – German" lang="de" hreflang="de" data-title="Learjet 28" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Learjet_28" title="Learjet 28 – Spanish" lang="es" hreflang="es" data-title="Learjet 28" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%84%DB%8C%D8%B1%D8%AC%D8%AA_%DB%B2%DB%B8" title="لیرجت ۲۸ – Persian" lang="fa" hreflang="fa" data-title="لیرجت ۲۸" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Learjet_28" title="Learjet 28 – French" lang="fr" hreflang="fr" data-title="Learjet 28" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Learjet_28" title="Learjet 28 – Indonesian" lang="id" hreflang="id" data-title="Learjet 28" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Learjet_28" title="Learjet 28 – Italian" lang="it" hreflang="it" data-title="Learjet 28" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Learjet_28" title="Learjet 28 – Dutch" lang="nl" hreflang="nl" data-title="Learjet 28" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Learjet_28" title="Learjet 28 – Polish" lang="pl" hreflang="pl" data-title="Learjet 28" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/Learjet_28" title="Learjet 28 – Russian" lang="ru" hreflang="ru" data-title="Learjet 28" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Learjet_28/29" 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.infobox-label{width:30%;padding-right:3px}.mw-parser-output .ib-aircraft .infobox-data{width:50%}}</style><table class="infobox ib-aircraft vcard"><tbody><tr><th colspan="2" class="infobox-above">Learjet 28/29</th></tr><tr><td colspan="2" class="infobox-full-data"><span typeof="mw:File"><a href="/wiki/File:Learjet_28-29.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Learjet_28-29.jpg/300px-Learjet_28-29.jpg" decoding="async" width="300" height="239" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Learjet_28-29.jpg/450px-Learjet_28-29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Learjet_28-29.jpg/600px-Learjet_28-29.jpg 2x" data-file-width="1536" data-file-height="1222" /></a></span></td></tr><tr><th colspan="2" class="infobox-header">General information</th></tr><tr><th scope="row" class="infobox-label">Type</th><td class="infobox-data"><a href="/wiki/Business_jet" title="Business jet">Business jet</a></td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Aerospace_manufacturer" title="Aerospace manufacturer">Manufacturer</a></th><td class="infobox-data"><a href="/wiki/Learjet" title="Learjet">Learjet</a></td></tr><tr><th scope="row" class="infobox-label">Status</th><td class="infobox-data">Retired</td></tr><tr><th scope="row" class="infobox-label">Number built</th><td class="infobox-data">9</td></tr><tr><th colspan="2" class="infobox-header">History</th></tr><tr><th scope="row" class="infobox-label">Manufactured</th><td class="infobox-data">1977–1982</td></tr><tr><th scope="row" class="infobox-label">First flight</th><td class="infobox-data">August 24, 1977</td></tr><tr><th scope="row" class="infobox-label">Developed from</th><td class="infobox-data"><a href="/wiki/Learjet_25" title="Learjet 25">Learjet 25</a></td></tr><tr><th scope="row" class="infobox-label">Developed into</th><td class="infobox-data"><a href="/wiki/Learjet_31" title="Learjet 31">Learjet 31</a></td></tr></tbody></table> <p>The <b>Learjet 28</b> is an American eight-to-ten-seat (two crew and six to eight passengers), twin-engine, high-speed <a href="/wiki/Business_jet" title="Business jet">business jet</a>, intended to be the successor to the <a href="/wiki/Learjet_25" title="Learjet 25">Learjet 25</a>. The <b>Learjet 29</b> is identical except for the addition of a long-range fuel tank, resulting in the reduction of the capacity to six (two crew and four passengers). Both were manufactured by <a href="/wiki/Learjet" title="Learjet">Learjet</a> and were marketed under the <b>Longhorn</b> name.<sup id="cite_ref-airliners_1-0" class="reference"><a href="#cite_note-airliners-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Learjet_28&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The first flight of the Learjet 28 took place on August 24, 1977.<sup id="cite_ref-wok_2-0" class="reference"><a href="#cite_note-wok-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The Learjet 28/29 was based on the <a href="/wiki/Learjet_25" title="Learjet 25">Learjet 25</a>, and received a completely new wing fitted with winglets which resulted in improved performance and fuel economy.<sup id="cite_ref-airliners_1-1" class="reference"><a href="#cite_note-airliners-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The new wing was designed for the <a href="/wiki/Learjet_55" title="Learjet 55">Learjet 55</a>, and the Learjet 28 was originally planned to be a testbed for the wing, not a production type, but after the prototypes demonstrated excellent climb performance and the ability to operate at 51,000 ft (16,000 m) (the first business jet to do so), it was decided to offer the Learjet 28 and 29 as production aircraft.<sup id="cite_ref-abawp189_3-0" class="reference"><a href="#cite_note-abawp189-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> FAA certification was awarded to both the Learjet 28 and 29 on January 30, 1979.<sup id="cite_ref-Janes_up_p317-8_4-0" class="reference"><a href="#cite_note-Janes_up_p317-8-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-abawp189_3-1" class="reference"><a href="#cite_note-abawp189-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>The Learjet 28/29 was the first production jet aircraft to utilize winglets<sup id="cite_ref-reynolds1979_5-0" class="reference"><a href="#cite_note-reynolds1979-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> (entering service in 1977). </p><p>Both models were commercially unsuccessful, showing reduced range compared to the Learjet 31, as the addition of winglets required the deletion of the earlier model's wingtip tanks, and they sold mainly to customers with a requirement for good altitude performance.<sup id="cite_ref-abawp189_3-2" class="reference"><a href="#cite_note-abawp189-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> Only five production Learjet 28s, and four Learjet 29s, were constructed before production ceased in August 1982.<sup id="cite_ref-jawa82p367_6-0" class="reference"><a href="#cite_note-jawa82p367-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> Both types were subsequently replaced by the <a href="/wiki/Learjet_31" title="Learjet 31">Learjet 31</a>. </p><p>The first production aircraft was used by <a href="/wiki/Neil_Armstrong" title="Neil Armstrong">Neil Armstrong</a> to set five aerospace records.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Noise_compliance">Noise compliance</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Learjet_28&action=edit&section=2" title="Edit section: Noise compliance"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In 2013, the FAA modified 14 CFR part 91 rules to prohibit the operation of jets weighing 75,000 pounds or less that are not stage 3 noise compliant after December 31, 2015. The Learjet 28 is listed explicitly in Federal Register <a rel="nofollow" class="external text" href="https://www.gpo.gov/fdsys/granule/FR-2013-07-02/2013-15843/content-detail.html">78 FR 39576</a>. Any Learjet 28s that have not been modified by installing Stage 3 noise compliant engines or have not had "hushkits" installed for non-compliant engines will not be permitted to fly in the contiguous 48 states after December 31, 2015. <i>14 CFR §91.883 Special flight authorizations for jet airplanes weighing 75,000 pounds or less</i> – lists special flight authorizations that may be granted for operation after December 31, 2015. </p> <div class="mw-heading mw-heading2"><h2 id="Specifications_(Learjet_28)"><span id="Specifications_.28Learjet_28.29"></span>Specifications (Learjet 28)</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Learjet_28&action=edit&section=3" title="Edit section: Specifications (Learjet 28)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p style="font-size: 90%; margin:0;"><i>Data from</i> Jane's Civil and Military Aircraft Upgrades 1994–95<sup id="cite_ref-Janes_up_p317-8_4-1" class="reference"><a href="#cite_note-Janes_up_p317-8-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup></p><p><span style="font-size:120%"><b>General characteristics</b></span> </p><ul><li><b>Crew:</b> 2</li> <li><b>Capacity:</b> 8 passengers</li> <li><b>Length:</b> 47 ft 7 in (14.51 m)</li> <li><b>Wingspan:</b> 43 ft 10 in (13.35 m)</li> <li><b>Height:</b> 12 ft 3 in (3.73 m)</li> <li><b>Wing area:</b> 264.5 sq ft (24.57 m<sup>2</sup>)</li> <li><b>Empty weight:</b> 8,267 lb (3,750 kg)</li> <li><b>Gross weight:</b> 15,000 lb (6,804 kg)</li> <li><b>Powerplant:</b> 2 × <a href="/wiki/General_Electric_CJ-610" class="mw-redirect" title="General Electric CJ-610">General Electric CJ-610</a>-8A <a href="/wiki/Turbojet" title="Turbojet">turbojet</a>, 2,950 lbf (13.1 kN) thrust each</li></ul> <p><span style="font-size:120%"><b>Performance</b></span> </p> <ul><li><b>Maximum speed:</b> 549 mph (884 km/h, 477 kn) at 25,000 ft (7,620 m)</li> <li><b>Cruise speed:</b> 470 mph (760 km/h, 410 kn) ,econ cruise at 51,000 ft (15,545 m)</li> <li><b>Stall speed:</b> 103 mph (165 km/h, 89 kn)</li> <li><b>Range:</b> 1,309 mi (2,107 km, 1,137 nmi)</li> <li><b>Service ceiling:</b> 51,000 ft (16,000 m)</li></ul> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Learjet_28&action=edit&section=4" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p> <b>Related development</b> </p> <ul><li><a href="/wiki/Learjet_25" title="Learjet 25">Learjet 25</a></li> <li><a href="/wiki/Learjet_31" title="Learjet 31">Learjet 31</a></li></ul> <p class="mw-empty-elt"> </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Learjet_28&action=edit&section=5" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <dl><dt>Notes</dt></dl> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-airliners-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-airliners_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-airliners_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www.airliners.net/info/stats.main?id=264">A history of the LJ23-LJ29 series on Airliners.net</a></span> </li> <li id="cite_note-wok-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-wok_2-0">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20061231131658/http://www.wingsoverkansas.com/history/article.asp?id=199">"Learjet company timeline"</a>. Archived from <a rel="nofollow" class="external text" href="http://www.wingsoverkansas.com/history/article.asp?id=199">the original</a> on 2006-12-31<span class="reference-accessdate">. Retrieved <span class="nowrap">2007-01-08</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Learjet+company+timeline&rft_id=http%3A%2F%2Fwww.wingsoverkansas.com%2Fhistory%2Farticle.asp%3Fid%3D199&rfr_id=info%3Asid%2Fen.wikipedia.org%3ALearjet+28" class="Z3988"></span></span> </li> <li id="cite_note-abawp189-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-abawp189_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-abawp189_3-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-abawp189_3-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text">Griffiths <i>Air-Britain Aviation World</i> Autumn 2022, p. 189.</span> </li> <li id="cite_note-Janes_up_p317-8-4"><span class="mw-cite-backlink">^ <a href="#cite_ref-Janes_up_p317-8_4-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Janes_up_p317-8_4-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">Michell 1994, pp. 317–318.</span> </li> <li id="cite_note-reynolds1979-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-reynolds1979_5-0">^</a></b></span> <span class="reference-text">Reynolds's The Learjet “Longhorn” Series—The First Jets With Winglets</span> </li> <li id="cite_note-jawa82p367-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-jawa82p367_6-0">^</a></b></span> <span class="reference-text">Taylor 1982, p. 367</span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRichardson2020" class="citation news cs1">Richardson, Joshua (5 August 2020). <a rel="nofollow" class="external text" href="http://dayton247now.com/news/local/historic-learjet-donated-to-armstrong-air-space-museum">"Historic Learjet donated to Armstrong Air & Space Museum"</a>. <i>Dayton 24/7 Now</i><span class="reference-accessdate">. Retrieved <span class="nowrap">7 August</span> 2020</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Dayton+24%2F7+Now&rft.atitle=Historic+Learjet+donated+to+Armstrong+Air+%26+Space+Museum&rft.date=2020-08-05&rft.aulast=Richardson&rft.aufirst=Joshua&rft_id=http%3A%2F%2Fdayton247now.com%2Fnews%2Flocal%2Fhistoric-learjet-donated-to-armstrong-air-space-museum&rfr_id=info%3Asid%2Fen.wikipedia.org%3ALearjet+28" class="Z3988"></span></span> </li> </ol></div></div> <dl><dt>Bibliography</dt></dl> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGriffiths2022" class="citation magazine cs1">Griffiths, Andrew (Autumn 2022). "Learjet – The End of an Era: Part 2: Wingletted Wonders". <i>Air-Britain Aviation World</i>. pp. 189–193. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/1742-996X">1742-996X</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Air-Britain+Aviation+World&rft.atitle=Learjet+%E2%80%93+The+End+of+an+Era%3A+Part+2%3A+Wingletted+Wonders&rft.ssn=fall&rft.pages=189-193&rft.date=2022&rft.issn=1742-996X&rft.aulast=Griffiths&rft.aufirst=Andrew&rfr_id=info%3Asid%2Fen.wikipedia.org%3ALearjet+28" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMichell1994" class="citation book cs1">Michell, Simon, ed. (1994). <i>Jane's Civil and Military Aircraft Upgrades 1994–95</i>. Coulsdon, UK: Jane's Information Group. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-7106-1208-7" title="Special:BookSources/0-7106-1208-7"><bdi>0-7106-1208-7</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Jane%27s+Civil+and+Military+Aircraft+Upgrades+1994%E2%80%9395&rft.place=Coulsdon%2C+UK&rft.pub=Jane%27s+Information+Group&rft.date=1994&rft.isbn=0-7106-1208-7&rfr_id=info%3Asid%2Fen.wikipedia.org%3ALearjet+28" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFTaylor1982" class="citation book cs1"><a href="/wiki/John_W._R._Taylor" title="John W. R. Taylor">Taylor, John W. R.</a>, ed. (1982). <i>Jane's All the World's Aircraft 1982–83</i>. London: Jane's Yearbooks. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-7106-0748-2" title="Special:BookSources/0-7106-0748-2"><bdi>0-7106-0748-2</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Jane%27s+All+the+World%27s+Aircraft+1982%E2%80%9383&rft.place=London&rft.pub=Jane%27s+Yearbooks&rft.date=1982&rft.isbn=0-7106-0748-2&rfr_id=info%3Asid%2Fen.wikipedia.org%3ALearjet+28" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFReynolds1979" class="citation journal cs1">Reynolds, Peter T. (1979). "The Learjet "Longhorn" Series—The First Jets With Winglets". <i>SAE Technical Paper 790581</i>. SAE Technical Paper Series. <b>1</b>. Jane's Yearbooks. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.4271%2F790581">10.4271/790581</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=SAE+Technical+Paper+790581&rft.atitle=The+Learjet+%22Longhorn%22+Series%E2%80%94The+First+Jets+With+Winglets&rft.volume=1&rft.date=1979&rft_id=info%3Adoi%2F10.4271%2F790581&rft.aulast=Reynolds&rft.aufirst=Peter+T.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ALearjet+28" class="Z3988"></span></li></ul> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Learjet_28&action=edit&section=6" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media 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padding-left:2px">‍</span>]</span></sup></li> <li><a rel="nofollow" class="external text" href="http://www.airwar.ru/enc_e/aliner/ljet29.html">Specs of LJ29</a><sup class="noprint Inline-Template"><span style="white-space: nowrap;">[<i><a href="/wiki/Wikipedia:Link_rot" title="Wikipedia:Link rot"><span title=" Dead link tagged December 2017">permanent dead link</span></a></i><span style="visibility:hidden; color:transparent; padding-left:2px">‍</span>]</span></sup></li> <li><a rel="nofollow" class="external text" href="http://www.airliners.net/info/stats.main?id=264">A history of the LJ23-LJ29 series on Airliners.net</a></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline 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