{"id":9851,"date":"2025-07-20T14:23:09","date_gmt":"2025-07-20T06:23:09","guid":{"rendered":"https:\/\/tommykwan.com\/blog\/?p=9851"},"modified":"2025-07-20T14:24:34","modified_gmt":"2025-07-20T06:24:34","slug":"isa-deviation","status":"publish","type":"post","link":"https:\/\/tommykwan.com\/blog\/aviation\/isa-deviation\/","title":{"rendered":"ISA Deviation"},"content":{"rendered":"<p>Example: FL290 ; OAT -47 degree C<\/p>\n<blockquote><p>ISA standard = 15 &#8211; (feet \/1000) * 2<\/p>\n<p>ISA Deviation = OAT &#8211; ISA standard<\/p><\/blockquote>\n<p>FL 290 : 29,000 feet, so ISA standard @ FL 290 = 15- (29*2) = -43 degree C<\/p>\n<p>ISA deviation = -47 &#8211; -(43)\u00a0 = ISA-4 degree C<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/youtu.be\/_oWqu12Dm6M?si=eUYvJoTQD_EOKKl2\">https:\/\/youtu.be\/_oWqu12Dm6M?si=eUYvJoTQD_EOKKl2<\/a><\/p>\n<div class=\"embed-container\"><iframe loading=\"lazy\" title=\"ISA Deviation Calculation\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/_oWqu12Dm6M?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Example: FL290 ; OAT -47 degree C ISA standard = 15 &#8211; (feet \/1000) * 2 ISA Deviation = OAT &#8211; ISA standard FL 290 : 29,000 feet, so ISA standard @ FL 290 = 15- (29*2) = -43 degree C ISA deviation = -47 &#8211; -(43)\u00a0 = ISA-4 degree C &nbsp; https:\/\/youtu.be\/_oWqu12Dm6M?si=eUYvJoTQD_EOKKl2<a class=\"read-more \" href=\"https:\/\/tommykwan.com\/blog\/aviation\/isa-deviation\/\" title=\"Read More\"> <span class=\"button default\">Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[64,72],"tags":[],"class_list":["post-9851","post","type-post","status-publish","format-standard","hentry","category-aviation","category-meteorology"],"_links":{"self":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/9851","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/comments?post=9851"}],"version-history":[{"count":2,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/9851\/revisions"}],"predecessor-version":[{"id":9853,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/9851\/revisions\/9853"}],"wp:attachment":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/media?parent=9851"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/categories?post=9851"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/tags?post=9851"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}