{"id":7591,"date":"2024-03-16T19:06:52","date_gmt":"2024-03-16T11:06:52","guid":{"rendered":"https:\/\/tommykwan.com\/blog\/?p=7591"},"modified":"2024-03-16T19:15:09","modified_gmt":"2024-03-16T11:15:09","slug":"%e9%bb%9e%e6%a8%a3%e7%9f%a5%e6%a9%9f%e5%a0%b4qnh-%e9%bb%9e%e6%a8%a3%e7%9f%a5local-pressure-how-to-know-the-qnh-how-to-know-local-pressure","status":"publish","type":"post","link":"https:\/\/tommykwan.com\/blog\/aviation\/%e9%bb%9e%e6%a8%a3%e7%9f%a5%e6%a9%9f%e5%a0%b4qnh-%e9%bb%9e%e6%a8%a3%e7%9f%a5local-pressure-how-to-know-the-qnh-how-to-know-local-pressure\/","title":{"rendered":"\u9ede\u6a23\u77e5\u6a5f\u5834QNH? \u9ede\u6a23\u77e5Local Pressure? How to know the QNH? How to know local pressure?"},"content":{"rendered":"

\u4eca\u65e5\u4e0a\u5b8c\u5802\u518d\u5538\u5de6\u6210\u500b\u4e0b\u5348\u5148\u597dD \u901a\u5de6D, \u6240\u4ee5\u4e00\u5b9a\u8981\u8a18\u5e95\u4f62…\u5c0f\u5587\u53ed, \u5462\u500bConcept \u597d\u96e3\u660e! Anyway, mark \u4f4e\u4f62\u5148!<\/p>\n

Reading (in feet)\u00a0 = (Set QNH – Actual pressure level) * 30<\/strong><\/p>\n

For example, if the aerodrome is 30 feet Elevation and \u7576\u6642QNH\u662f1013, then<\/p>\n

Reading (in feet)\u00a0 = (Set QNH – Actual pressure level) * 30<\/p>\n

30 = ( 1013 – Actual pressure level )\uff0a 30<\/p>\n

30\/30 = ( 1013 – Actual pressure level )<\/p>\n

Actual pressure level\u00a0= 1013 – 1<\/p>\n

Actual pressure level = 1012
\n\u9019\u88e1\u8868\u9054\u7684\u662f\u7576\u75281013 \u505aReference Datum \u6642, \u98db\u6a5f\u5c31\u6703experience 1012 pressure level, \u800c\u5c0d\u61c9\u65e2\u9ad8\u5ea6\u5c31\u662fElevation, \u537330 feet<\/p>\n

\u540c\u7406, set altimeter to 0, read \u5230\u5c31\u662flocal experience pressure!<\/p>\n

 <\/p>\n

\u8003\u8a66\u984c\u76ee:<\/p>\n

\u7531\u65bcQNH \u6703\u8b8a, \u5982\u679c\u77e5\u9053\u6a5f\u5834\u65e2Elevation<\/strong>, \u6211\u5730\u5c31\u53ef\u4ee5\u63a8\u51fa\u7576\u6642\u65e2QNH!<\/strong><\/p>\n

For example, \u6a5f\u5834ELEV 90 feet<\/p>\n

    \n
  1. Set \u5230 read \u5230 30 feet<\/strong>, \u53d6\u5f97QNH, \u5047\u5982\u662f1015<\/li>\n
  2. then<\/strong> use formula QNH – 1 \u5f97\u5230 X (actual pressure level)<\/strong>,
    \n30 = (1015 – actual pressure level) * 30
    \n30\/30 = 1015 – actual pressure level
    \n1 = 1015 – actual pressure level
    \nactual pressure level = 1015-1 = 1014 hPa
    \n\u90a3\u4ee3\u8868\u98db\u6a5f\u7576\u6642Actual pressure level \u662f1015-1 = 1014 hPa<\/li>\n
  3. then use formula again, Reading (in feet)\u00a0 = (Set QNH – Actual pressure level) * 30
    \nELEV = (QNH – X ) * 30\u00a0<\/strong>
    \n90 = (QNH – 1014) * 30
    \n90\/30 = QNH – 1014
    \nQNH = 3 + 1014
    \nQNH = 1017 hPa<\/li>\n<\/ol>\n

     <\/p>\n","protected":false},"excerpt":{"rendered":"

    \u4eca\u65e5\u4e0a\u5b8c\u5802\u518d\u5538\u5de6\u6210\u500b\u4e0b\u5348\u5148\u597dD \u901a\u5de6D, \u6240\u4ee5\u4e00\u5b9a\u8981\u8a18\u5e95\u4f62…\u5c0f\u5587\u53ed, \u5462\u500bConcept \u597d\u96e3\u660e! Anyway, mark \u4f4e\u4f62\u5148! Reading (in feet)\u00a0 = (Set QNH – Actual pressure level) * 30 For example, if the aerodrome is 30 feet Elevation and \u7576\u6642QNH\u662f1013, then Reading (in feet)\u00a0 = (Set QNH – Actual pressure level) * 30 30 = ( 1013 – Actual pressure level )\uff0a 30 30\/30 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":[64,65],"tags":[],"class_list":["post-7591","post","type-post","status-publish","format-standard","hentry","category-aviation","category-bak"],"_links":{"self":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/7591","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=7591"}],"version-history":[{"count":8,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/7591\/revisions"}],"predecessor-version":[{"id":7599,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/posts\/7591\/revisions\/7599"}],"wp:attachment":[{"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/media?parent=7591"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/categories?post=7591"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tommykwan.com\/blog\/wp-json\/wp\/v2\/tags?post=7591"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}