{"id":3861,"date":"2021-11-20T19:46:28","date_gmt":"2021-11-20T11:46:28","guid":{"rendered":"http:\/\/caucanimax.com\/blog\/?p=3861"},"modified":"2021-11-21T10:18:17","modified_gmt":"2021-11-21T02:18:17","slug":"tr-80785654_02","status":"publish","type":"post","link":"https:\/\/caucanimax.com\/blog\/tr-80785654_02\/","title":{"rendered":"A350\u673a\u7ffc\u6cb9\u7bb1\u6cc4\u6f0f\u65f6\uff0c\u80fd\u5426\u901a\u8fc7 TK XFR \u4fdd\u5b58\u71c3\u6cb9\uff1f"},"content":{"rendered":"

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

A350 \u4f7f\u7528L(R) TK XFR \u6309\u94ae\u63a5\u901a\uff0c\u53ef\u4ee5\u6253\u5f00\u52a0\u6cb9\u7ba1\u8def\u4e2d\u673a\u7ffc\u6cb9\u7bb1\u548c\u4e2d\u592e\u6cb9\u7bb1\u7684 INLET VALVE\uff0c\u673a\u7ffc\u6cb9\u7bb1\u7684\u6cb9\u4f1a\u91cd\u529b\u4f20\u8f93\u5230\u4e2d\u592e\u6cb9\u7bb1\u3002\u8fd9\u79cd\u9014\u5f84\u4e00\u822c\u662f\u5728\u4ea4\u8f93\u6d3b\u95e8\u4e0d\u5de5\u4f5c\uff08\u6545\u969c\u6216\u8005\u88ab\u8981\u6c42\u5173\u95ed\uff09\uff0c\u4ee5\u53ca\u673a\u7ffc\u6cb9\u7bb1\u6cf5\u4e0d\u5de5\u4f5c\u7684\u65f6\u5019\u4f1a\u7528\u5230\u3002<\/p>\n

<\/p>\n

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

FUEL CROSSFEED VLV A+B FAULT \u7684\u7a0b\u5e8f\uff1a<\/p>\n

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

 <\/p>\n

\u90a3\u5982\u679c\u9047\u5230\u673a\u7ffc\u6cb9\u7bb1\u6cc4\u6f0f\uff0c\u7528 TK XFR \u6765\u5c06\u673a\u7ffc\u6cb9\u7bb1\u7684\u4f20\u8f93\u5230\u4e2d\u592e\u6cb9\u7bb1\uff0c\u4e0d\u5c31\u53ef\u4ee5\u5c3d\u53ef\u80fd\u7684\u4fdd\u5b58\u4e00\u4e9b\u71c3\u6cb9\u4e48\uff1f\u4f46\u7a0b\u5e8f\u91cc\u5e76\u6ca1\u6709\u8fd9\u4e2a\u52a8\u4f5c\u3002<\/p>\n

\u8fd9\u4e2a\u95ee\u9898\u6765\u6765\u56de\u56de\u95ee\u4e86\u7a7a\u5ba23\u6b21\u3002\u7b2c\u4e00\u6b21\u56de\u7b54\u8bf4 TK XFR \u4f20\u8f93\u901f\u7387\u5f88\u4f4e\uff0c\u4e0e\u6f0f\u6cb9\u76f8\u6bd4\u53ef\u4ee5\u5ffd\u7565\uff0c\u610f\u4e49\u4e0d\u5927\u3002\u6211\u53c8\u95ee\u5f88\u4f4e\u662f\u7531\u591a\u4f4e\uff0c\u518d\u4f4e\u4e5f\u80fd\u4fdd\u5b58\u4e00\u90e8\u5206\u71c3\u6cb9\u5427\uff0c\u800c\u4e14\u5728 FUEL L(R) MAIN+STBY PMPs FAULT \u4e2d\uff0c\u5f53\u4f7f\u7528 TK XFR \u5411\u4e2d\u592e\u6cb9\u7bb1\u4f20\u8f93\u71c3\u6cb9\u4e4b\u540e\uff0c\u90fd\u53ef\u4ee5\u7528\u6765\u4fdd\u8bc1\u53d1\u52a8\u673a\u4f9b\u6cb9\uff0c\u8bf4\u660e\u4f20\u8f93\u901f\u7387\u8d85\u8fc7\u53d1\u52a8\u673a\u6cb9\u8017\u901f\u7387\uff0c\u4e0d\u7b97\u4f4e\u4e86\u3002<\/p>\n

\u7b2c\u4e8c\u6b21\u7a7a\u5ba2\u7684\u56de\u590d\u5b8c\u5168\u9519\u8bef\uff0c\u6ca1\u6709\u53ef\u53c2\u8003\u6027\u3002\u77e5\u9053\u7b2c\u4e09\u6b21\u624d\u7ed9\u51fa\u4e86\u4e00\u4e2a\u52c9\u5f3a\u53ef\u4ee5\u62ff\u6765\u8ba8\u8bba\u7684\u8bf4\u6cd5<\/p>\n

\u7a7a\u5ba2\u8ba4\u4e3a\uff0c\u4ece\u7406\u8bba\u4e0a\u8bb2\u5f88\u96be\u51fa\u73b0\u5927\u91cf\u71c3\u6cb9\u7684\u76f4\u63a5\u6cc4\u6f0f\uff08\u8fd9\u5c31\u5df2\u7ecf\u4e0e\u7b2c\u4e00\u6b21\u7684\u56de\u590d\u4e0d\u4e00\u81f4\u4e86\uff09\uff0c\u5b9e\u9645\u8fd0\u884c\u4e2d\u4e5f\u6ca1\u6709\u51fa\u73b0\u8fc7\u8fd9\u6837\u7684\u4e8b\u4ef6\uff0c\u6240\u4ee5\u8003\u8651\u5230\u71c3\u6cb9\u7684\u53ef\u7528\u9014\u5f84\uff0c\u6700\u597d\u8fd8\u662f\u4fdd\u7559\u5728\u673a\u7ffc\u6cb9\u7bb1\u3002\u56e0\u4e3a\u8fd9\u6837\u53ef\u4ee5\u901a\u8fc7\u673a\u7ffc\u6cb9\u7bb1\u6cb9\u6cf5\u4f9b\u6cb9\u3001\u91cd\u529b\u4f9b\u6cb9\uff0c\u6700\u540e\u8fd8\u53ef\u4ee5\u4f20\u8f93\u5230\u4e2d\u592e\u6cb9\u7bb1\u901a\u8fc7\u4e2d\u592e\u6cb9\u7bb1\u6cf5\u4f9b\u6cb9\u3002\u4f46\u5982\u679c\u5df2\u7ecf\u4f20\u8f93\u5230\u4e86\u4e2d\u592e\u6cb9\u7bb1\uff0c\u5c31\u53ea\u80fd\u901a\u8fc7\u4e2d\u592e\u6cb9\u7bb1\u6cf5\u4f9b\u6cb9\uff0c\u53ef\u7528\u9014\u5f84\u5c31\u51cf\u5c11\u4e86\u3002\u5047\u8bbe\u518d\u4f34\u968f\u4e00\u4e9b MEL, \u6bd4\u5982\u4e00\u4e2a\u4e2d\u592e\u6cb9\u7bb1\u6cf5\u4e0d\u53ef\u7528\uff0c\u5f53\u9047\u5230\u53e6\u4e00\u4e2a\u4e2d\u592e\u6cb9\u7bb1\u6cf5\u4e5f\u6545\u969c\u65f6\uff0c\u8fd9\u90e8\u5206\u6cb9\u5c31\u5f7b\u5e95\u4e0d\u53ef\u7528\u4e86\u3002<\/p>\n

\u8fd9\u4e2a\u89e3\u91ca\u63d0\u4f9b\u4e86\u53e6\u5916\u4e00\u79cd\u8003\u8651\u95ee\u9898\u7684\u89c6\u89d2\uff0c\u5373\u4fdd\u7559\u66f4\u591a\u4f7f\u7528\u9014\u5f84\u3002\u8fd9\u6837\u505a\u6709\u597d\u5904\u4e5f\u6709\u98ce\u9669\uff0c\u4f46\u7a7a\u5ba2\u5e76\u6ca1\u6709\u8bf4\u660e\u662f\u5426\u9488\u5bf9\u4e0d\u540c\u7684\u6545\u969c\u60c5\u51b5\u8bc4\u4f30\u8fc7\u98ce\u9669\u503c\u3002\u662f\u5728\u6240\u6709\u60c5\u51b5\u4e0b\uff0c\u4e0d\u4f7f\u7528 TK XFR \u7684\u98ce\u9669\u503c\u90fd\u5c0f\u4e8e\u4f7f\u7528\uff0c\u8fd8\u662f\u53ef\u4ee5\u6839\u636e\u60c5\u51b5\u6765\u9009\u62e9\u3002\u6bd5\u7adf\u4e0a\u8ff0\u4f8b\u5b50\u4e2d\u4e24\u4e2a\u4e2d\u592e\u6cb9\u7bb1\u6cf5\u53c8\u90fd\u574f\u6389\u7684\u6982\u7387\u4e5f\u662f\u76f8\u5f53\u7684\u4f4e\uff0c\u8bf4\u670d\u529b\u5b9e\u5728\u6709\u9650\u3002<\/p>\n

\u9274\u4e8e\u518d\u591a\u6b21\u6c9f\u901a\u4e2d\uff0c\u7531\u4e8e\u8bed\u8a00\u8868\u8fbe\u7684\u4e00\u4e9b\u969c\u788d\u3001\u5173\u6ce8\u70b9\u4e0d\u5b8c\u5168\u7edf\u4e00\u3001\u4ee5\u53ca\u7a7a\u5ba2\u5bf9\u67d0\u4e9b\u7ec6\u8282\u4e0d\u613f\u610f\u628a\u8bdd\u8bf4\u6b7b\u7684\u4e60\u60ef\uff0c\u6211\u4e0d\u51c6\u5907\u518d\u53bb\u8bc1\u5b9e\u3002\u4f46\u8fd9\u5df2\u7ecf\u8ba9\u6211\u4e86\u89e3\u4e86\u7a7a\u5ba2\u5728\u7a0b\u5e8f\u4e2d\u7684\u8003\u91cf\uff0c\u5982\u679c\u5728\u5b9e\u9645\u98de\u884c\u4e2d\u771f\u7684\u9047\u5230\u71c3\u6cb9\u6cc4\u6f0f\uff0c\u80fd\u591f\u7ed9\u51b3\u7b56\u63d0\u4f9b\u66f4\u591a\u7684\u652f\u6301\u3002\u5177\u4f53\u5730\u8bf4\uff0c\u5728\u71c3\u6cb9\u6cc4\u6f0f\u901f\u7387\u8fc7\u5feb\uff0c\u6216\u8005\u5269\u4f59\u71c3\u6cb9\u5df2\u7ecf\u975e\u5e38\u7d27\u5f20\u7684\u60c5\u51b5\u4e0b\uff0c\u6211\u8ba4\u4e3a\u4f7f\u7528 TK XFR \u5c3d\u91cf\u4fdd\u5b58\u71c3\u6cb9\u662f\u66f4\u597d\u7684\u9009\u62e9\u3002<\/p>\n

 <\/p>\n

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

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

In FUEL CROSSFEED VLV A+B FAULT, we can use fuel in opposite tank by transferring fuel from wing tank to center tank.<\/p>\n

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

In case of fuel leak is confirmed from wing tank instead of eng, why not using the same way to save fuel? Fuel can be transferred to center tank as much as possible, then it can feed eng by ctr tk pump.<\/p>\n

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

In normal operation, fuel transfer from a wing to center tank is not required, however in-flight the crew can initiate a manual gravity transfer via the L\/R Tank XFR PB-SW in overhead panel AS REQUESTED BY ECAM.
\nOperating the L\/R TK XFR BP SW is not included in the FUEL LEAK procedure, therefore during the FUEL LEAK procedure the crew shall strictly follow the ABN FUEL LEAK procedure.
\nNote: The rate of gravity fuel transfer from WING to CENTER tank is relatively low, therefore negligible when compared to the rate of fuel leak loss!<\/p>\n

Q_2:<\/p>\n

I still have some concerns about TK XFR.<\/p>\n

Fisrtly, there is not a standard for rate of fuel leak, how to compare with tha rate of fuel transfer from wing center? Secondly, whatever the rate, there’s no disadventage of this transfer. If this part of fuel is not transfered to center tank, the only way is just leaking. It’s obvious which way is better. We should save the fuel as much as posisble.<\/p>\n

A_2:<\/p>\n

On A350 the fuel pumps allow a faster transfer from wings to the center tank for the remaining operative engine and minimize the fuel leak. But they may lead to an unbalanced aircraft.
\nTherefore, the \u201cCrossfeed VLV A+B FAULT\u201d procedure uses the manual gravity transfer L(R) TK XFR ON: this procedure is not dedicated to the fuel leak.<\/p>\n

 <\/p>\n

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

I don’t understand your last answer. Maybe the previous quesitons ae not so clear, I’m going to express again. In fuel leak procedure, if wing leak is confirmed, we should restart the engine to maximum use the fuel. What I considered is why can’t we use TK XFR to save some fuel from leaking wing tank to center tank.<\/p>\n

Answer at the first time is “rate of gravity fuel transfer from WING to CENTER tank is relatively low”. But no matter how low the rate is, it can still save some fuel without any disadventage.<\/p>\n

Answer at the second time made me confused. How does “fuel pumps allow a faster transfer from wings to the center tank”? Can fuel pump transfer fuel from wing to center tank in the situation of wing tank leak, or even in normal feeding condition? And how do “they may lead to an unbalanced aircraft”. Due to wing leak, at last one wing tank will be empty. The severity of unbalance depends on the fuel quantity of opposite wing tank, other than the fuel quantity of center tank. It has already unbalanced.<\/p>\n

So back to the question. Why can’t we turn on L(R) TK XFR when L(R) wing tank leak is confirmed?<\/p>\n

 <\/p>\n

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

We regret that there was an error in the last answer, as there is no pumped transfer between the wing tank and the center tank. This is is a gravity transfer as mentioned in FCOM :<\/p>\n

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

Then, in the case of a fuel leak, it is extremely unlikely to be a direct and large fuel leak from a tank, as per structures design requirements. Also experience does not show examples of important and sudden tank leak. Therefore, considering the fuel availability, it remains preferable to keep the fuel in the wing tank, since the fuel from the wing tank can be sent to engine via the fuel pumps, sent to the engine via gravity suction, or ultimately sent to the center tank to be then pumped to the engine.<\/p>\n

On the other hand, the center tank fuel can only be pumped by one of the two center tank pumps, so it is less available to the engines in the case of a failure. In the case of a center tank fuel pump under MMEL for example, the entire center tank fuel can be trapped if the second pump fails.<\/p>\n","protected":false},"excerpt":{"rendered":"

A350 \u4f7f\u7528L(R) TK XFR \u6309\u94ae\u63a5\u901a\uff0c\u53ef\u4ee5\u6253\u5f00\u52a0\u6cb9\u7ba1\u8def\u4e2d\u673a\u7ffc\u6cb9\u7bb1\u548c\u4e2d\u592e\u6cb9\u7bb1\u7684 INLET VALVE … \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-3861","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\/3861","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=3861"}],"version-history":[{"count":5,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/posts\/3861\/revisions"}],"predecessor-version":[{"id":3871,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/posts\/3861\/revisions\/3871"}],"wp:attachment":[{"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/media?parent=3861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/categories?post=3861"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/tags?post=3861"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=3861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}