{"id":3872,"date":"2021-11-21T13:18:12","date_gmt":"2021-11-21T05:18:12","guid":{"rendered":"http:\/\/caucanimax.com\/blog\/?p=3872"},"modified":"2021-11-21T13:18:12","modified_gmt":"2021-11-21T05:18:12","slug":"tr-80791877-q11","status":"publish","type":"post","link":"https:\/\/caucanimax.com\/blog\/tr-80791877-q11\/","title":{"rendered":"A350 FEEDLINE BURST \u80fd\u5426\u91cd\u542f\u53d1\u52a8\u673a"},"content":{"rendered":"

\"\"<\/a><\/p>\n

\u7531\u4e8e\u71c3\u6cb9\u4e2d\u6709\u6c14\u6ce1\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u91cd\u529b\u4f9b\u6cb9\u7684\u7a33\u5b9a\u6027\uff0c\u9700\u8981\u4e0b\u964d\u9ad8\u5ea6\u3002\u800c BURST \u4e00\u4fa7\u7684\u53d1\u52a8\u673a\u6709\u53ef\u80fd\u5728\u4e0b\u964d\u8fc7\u7a0b\u4e2d\u505c\u8f66\uff0c\u6240\u4ee5\u7a0b\u5e8f\u4e2d\u6709\u201dEXPECT ENG1(2) FLAME OUT\u201c\u5b57\u6837\u3002\u90a3\u4e48\u5230\u8fbe\u91cd\u529b\u4f9b\u6cb9\u5347\u9650\u4e4b\u540e\uff0c\u80fd\u5426\u91cd\u542f\u53d1\u52a8\u673a\u5462\uff1f\u7a0b\u5e8f\u91cc\u662f\u660e\u786e\u7981\u6b62\u7684\uff0c\u201dENG1(2) DO NOT RESTART\u201c\u3002<\/p>\n

\u4f46\u662f\uff0c\u5728 A330 \u7684 FUEL ENG 1(2) FEEDLINE BURST \u7a0b\u5e8f\u4e2d\uff0c\u5c31\u53ef\u4ee5\u8003\u8651\u91cd\u542f\u53d1\u52a8\u673a\u3002\u800c\u4e14\u4e5f\u7ecf\u8fc7\u673a\u52a1\u786e\u8ba4\uff0c\u4ed6\u4eec\u5728A330\u4e0a\u7684\u8bd5\u9a8c\uff0c\u5730\u9762\u4f7f\u7528\u91cd\u529b\u4f9b\u6cb9\u662f\u53ef\u4ee5\u6210\u529f\u542f\u52a8\u53d1\u52a8\u673a\u7684\u3002<\/p>\n

<\/p>\n

\"\"<\/a><\/p>\n

\u5bf9\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0c\u7a7a\u5ba2\u56de\u590d\u8bf4\uff0cA330\u548c A350\u7684\u6cb9\u7bb1\u7ed3\u6784\u4e0d\u540c\uff0cA330 \u4ece\u5916\u4fa7\u6cb9\u7bb1\u5411\u5185\u4fa7\u6cb9\u7bb1\u91cd\u529b\u4f20\u8f93\u6bd4\u8f83\u590d\u6742\uff0c\u9700\u8981\u98de\u673a\u4fdd\u6301\u4e00\u4e2a\u5761\u5ea6\uff0c\u64cd\u4f5c\u6bd4\u8f83\u590d\u6742\uff0c\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u91cd\u542f\u662f\u66f4\u65b9\u4fbf\u7684\u9009\u62e9\u3002A350\u53ef\u5219\u4ee5\u66f4\u5bb9\u6613\u5730\u5c06\u673a\u7ffc\u6cb9\u7bb1\u7684\u6cb9\u91cd\u529b\u4f20\u8f93\u5230\u4e2d\u592e\u6cb9\u7bb1\uff0c\u6240\u4ee5\uff0c\u8ba9\u53e6\u4e00\u53f0\u53d1\u52a8\u673a\u53bb\u4f7f\u7528\u5219\u662f\u66f4\u65b9\u4fbf\u7684\u9009\u62e9\u3002\u8fd9\u4e0d\u662f\u4e00\u4e2a\u7eaf\u7684\u6280\u672f\u95ee\u9898\uff0c\u800c\u662f\u6280\u672f\u4e0e\u8fd0\u884c\u7684\u7efc\u5408\u8003\u8651\u3002\u6240\u4ee5\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cA330 \u4e5f\u4ec5\u4ec5\u662f\u53ef\u4ee5\u8003\u8651\u91cd\u542f\uff0c\u800c\u4e0d\u662f\u5fc5\u987b\u91cd\u542f\u3002<\/p>\n

\u53c2\u8003 A330 [QRH] FUEL IMBALANCE\uff1a<\/p>\n

\"\"<\/a><\/p>\n

\n

TechRequest \u539f\u6587\uff1a<\/strong><\/p>\n

Q:<\/strong><\/p>\n

Why choose 30 min after flight time above FL 300 since departure for a threshold of MX FL? Is it ralated with cavitation of fuel? And if eng is flame out before descending to MAX FL, can we restart it after reach MAX FL?<\/p>\n

A:<\/strong><\/p>\n

This value is defined in order to get the fuel deaerated. The air bubbles<\/strong> that are in the fuel require some time and pressure in order to be released out of the fuel. When this is done (after 30 minutes at FL300), there is less air that may be released out of the fuel during gravity feed when the fuel is sucked by the engine, therefore, the gravity feed ceiling is increased. This is a matter of fuel physics, this is not
\ndirectly related to A350 design.
\nAs per ECAM procedure, the flight crew should not try to restart the affected engine.<\/p>\n

Q_2:<\/strong><\/p>\n

I just wondering why the eng can’t be restart. Is it because of gravity feeding?<\/p>\n

A_2:<\/strong><\/p>\n

This procedure requires to feed the engine by gravity, and a flame out is expected due to the feedline burst. After flame out, the engine restart is not required as it does not enable to recover the engine (due to the feedline burst). Then the remaining fuel from the affected wing is transferred to the center tank in order to be used for the remaining engine.<\/p>\n

Q_3:<\/strong><\/p>\n

In FUEL ENG 1(2) FEEDLINE BURST procedure of A330, there’s engine relight consideration after reaching gravity feed ceiling.<\/p>\n

And confirmed by our engineer, they’ve testet successfully starting engine of A330 by gravity feeding on ground.
\nSo for A350, why can’t we try to do the same? I know it maybe not able to recover, or maybe fuel leak exists. But the choice should be given to crew, we can evaluate the situation, and decide to relight or not. I think that’s the meaning of “CONSIDER” (in procedure of A330).<\/p>\n

A_3:<\/strong><\/p>\n

Many complex assumptions are taken into account<\/strong> for the development of the abnormal procedures. In this particular case, one objective is to maximize the amount of fuel available to the engines. Parameters such as the fuel tank and pipework geometry differs between A330 and A350, and justifies this difference.<\/p>\n

On A350, it is preferable to transfer the fuel by gravity to the center tank compared to spending time and with attempts to restart the engine.<\/p>\n

On A330, the gravity transfer of fuel is more complex and requires a bank angle<\/strong> to the aircraft, so it is preferable to consider engine relight at gravity feed ceiling.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u7531\u4e8e\u71c3\u6cb9\u4e2d\u6709\u6c14\u6ce1\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u91cd\u529b\u4f9b\u6cb9\u7684\u7a33\u5b9a\u6027\uff0c\u9700\u8981\u4e0b\u964d\u9ad8\u5ea6\u3002\u800c BURST \u4e00\u4fa7\u7684\u53d1\u52a8\u673a\u6709\u53ef\u80fd\u5728\u4e0b\u964d\u8fc7\u7a0b\u4e2d\u505c\u8f66\uff0c … \u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[113],"tags":[116],"ppma_author":[5],"class_list":["post-3872","post","type-post","status-publish","format-standard","hentry","category-fly","tag-a350"],"authors":[{"term_id":5,"user_id":2,"is_guest":0,"slug":"yaoguai","display_name":"\u5996\u602a","avatar_url":"https:\/\/secure.gravatar.com\/avatar\/dfe71d09a1a83f49a02a4400c69ef2c361c2d967eae2ffeeb6318b73a0da763f?s=96&r=g","0":null,"1":"","2":"","3":"","4":"","5":"","6":"","7":"","8":""}],"_links":{"self":[{"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/posts\/3872","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/comments?post=3872"}],"version-history":[{"count":2,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/posts\/3872\/revisions"}],"predecessor-version":[{"id":3878,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/posts\/3872\/revisions\/3878"}],"wp:attachment":[{"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/media?parent=3872"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/categories?post=3872"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/tags?post=3872"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=3872"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}