{"id":3426,"date":"2020-07-05T22:48:59","date_gmt":"2020-07-05T14:48:59","guid":{"rendered":"http:\/\/caucanimax.com\/blog\/?p=3426"},"modified":"2020-07-10T17:46:32","modified_gmt":"2020-07-10T09:46:32","slug":"mistake-in-a350-air-two-engs-bleed-fault","status":"publish","type":"post","link":"https:\/\/caucanimax.com\/blog\/mistake-in-a350-air-two-engs-bleed-fault\/","title":{"rendered":"A350\u53cc\u5f15\u6c14\u5931\u6548\u7a0b\u5e8f\u4e2d\u7684\u4e00\u70b9\u9519\u8bef"},"content":{"rendered":"

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

\u5728A350\u53cc\u5f15\u6c14\u5931\u6548\u7a0b\u5e8f\u4e2d\uff0c\u67093\u4e2d\u60c5\u51b5\u4f1a\u9700\u8981\u4e0b\u964d\u5230 FL100\/MEA-MORA\uff0c \u4f46\u53ea\u6709\u6700\u540e\u4e00\u79cd\u60c5\u51b5\u4e2d\uff0c\u4e5f\u5c31\u662f\u7b2c\u4e00\u6b21\u5f15\u6c14\u81ea\u52a8\u590d\u4f4d\u4e0d\u6210\u529f\uff0c\u4e0b\u5230 FL250\u4e4b\u540e APU \u5f15\u6c14\u4e0d\u53ef\u7528\uff0c\u6700\u540e\u4e0b\u5230 FL100\/MEA-MORA\uff0c\u7b2c\u4e8c\u6b21\u5f15\u6c14\u81ea\u52a8\u590d\u4f4d\u4e5f\u4e0d\u6210\u529f\u65f6\uff0c\u624d\u4f1a\u8981\u6c42 RAM AIR ON \u4ee5\u53ca CAB FAN OFF\u3002\u4e3a\u4ec0\u4e48\u5728\u5176\u4ed6\u4e24\u79cd\u60c5\u51b5\u4e0b\u4e0d\u8981\u6c42\u5462\uff1f<\/p>\n

\u7a7a\u5ba2\u7684\u7b2c\u4e00\u6b21\u56de\u590d\u6ca1\u6709\u89e3\u91ca\u6e05\u695a\uff0c\u5728\u7b2c\u4e8c\u6b21\u56de\u590d\u4e2d\u627f\u8ba4 CASE 2 \u7684\u60c5\u51b5\u4e0b\u4e5f\u5e94\u8be5\u8981\u6c42 RAM AIR ON \u4ee5\u53ca CAB FAN OFF\uff0c\u540e\u7eed\u4f1a\u4fee\u6539\u7a0b\u5e8f\u3002<\/p>\n

\u5728\u5404\u79cd\u9700\u8981\u4e0b\u964d\u5230 FL100\/MEA-MORA \u7684\u7a0b\u5e8f\u4e2d\uff0c\u6709\u7684\u8981\u6c42 RAM AIR ON \u4ee5\u53ca CAB FAN OFF\uff0c\u6709\u7684\u4ec5\u8981\u6c42 RAM AIR ON\uff0c\u9488\u5bf9\u8fd9\u4e00\u70b9\uff0c\u7a7a\u5ba2\u4e5f\u505a\u4e86\u56de\u590d\u3002<\/p>\n

\u53e6\u5916\u5728\u6a21\u62df\u673a\u4e2d\u8fd9\u4e2a ECAM \u8b66\u544a\u4f1a\u5728\u6267\u884c\u7a0b\u5e8f\u7684\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u4f1a\u6d88\u5931\uff0c\u8fd9\u5c31\u662f\u5728\u81ea\u52a8\u590d\u4f4d\uff0c\u5982\u679c\u590d\u4f4d\u4e0d\u6210\u529f\uff0c\u8b66\u544a\u53c8\u4f1a\u518d\u6b21\u51fa\u73b0\u3002<\/p>\n

\u5177\u4f53\u8bf7\u53c2\u8003 TechRequest \u539f\u6587\uff1a<\/p>\n

<\/p>\n

Q: AIR ENG 1+2 BLEED FAULT<\/strong>
\nThere’re several cases in which we have to descent to FL100\/MEA-MORA. Why only for the last case it requires to use RAM AIR? Is it a layout mistake?<\/p>\n

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

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

Airbus confirms that the indentation of the procedural lines\u00a0 “RAM AIR\u2026ON”\u00a0 and “CAB FANS\u2026OFF” are correct.
\nThe procedure lines\u00a0 “RAM AIR\u2026ON”\u00a0 and “CAB FANS\u2026OFF”\u00a0 will display on ECAM due to several conditions:
\n– Aircraft is not on ground
\n– Differential pressure < 2
\n– FL < 100\/MEA-MORA
\n– INHIBITED if no bleed reset authorized or if at least one side has been recovered
\n– INHIBITED if APU bleed has been running at least once and is not failed.
\nFrom the conditions and layout of the ECAM procedure, the \u201cRAM AIR\u2026ON\u201d and \u201cCAB FANS\u2026OFF\u201d are indented in the FCOM.<\/p>\n

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

Accodiong to INHIBITIED condition for “RAM AIR\u2026ON” and “CAB FANS\u2026OFF”. CASE 1 is “no bleed reset authorized”. However I can’t understand the condition for CASE 2. There’s the authorization, and no bleed recovered, and APU bleed has not been running.<\/p>\n

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

And furthermore, what’s the difference in\u00a0trigger condition between both “RAM AIR\u2026ON” and “CAB FANS\u2026OFF” and only\u00a0“RAM AIR\u2026ON”. For exemple, in AIR PACK 1+2 FAULT, in both condition, 2 PACKs are OFF, but only second condition wiil trigger CAB FAN OFF.<\/p>\n

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

Another example, in ENG ALL ENGINES FAILURE, when\u00a0 BELOW 10000FT AGL, only require RAM AIR ON, without CAB FAN OFF.<\/p>\n

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

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

After further investigation, we confirm that in \u201cCASE 2\u201d, as illustrated in your mind map, further ECAM actions will trigger. When the aircraft reaches FL 100\/MEA-MORA and the engine bleed is not recovered and the differential pressure is less than 2 PSI, the \u201cRAM AIR\u2026ON\u201d and \u201cCAB FANS\u2026OFF\u201d will trigger.Airbus confirms that the AIR ENG 1+2 BLEED FAULT procedure in A350 FCOM will be updated to reflect this change.<\/p>\n

The purpose of the procedure line \u201cCAB FANS\u2026OFF\u201d is to avoid unacceptable temperatures in case of\u201cRAM AIR\u2026ON\u201d. When in very cold or very hot environment, the cabin temperatures could reach unacceptable level for crew and passengers if the cabin air is recirculated. However, in AIR PACK 1+2 FAULT, for the case of pack overheat, the \u201cCAB FANS\u2026OFF\u201d is not applied because this could lead to a pack restart. For the case, of ALL ENGINE FAILURE, \u201cCAB FANS\u2026OFF\u201d is not applied because the flight crew will have to land as soon as possible and will not be exposed to extreme temperatures for long periods.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5728A350\u53cc\u5f15\u6c14\u5931\u6548\u7a0b\u5e8f\u4e2d\uff0c\u67093\u4e2d\u60c5\u51b5\u4f1a\u9700\u8981\u4e0b\u964d\u5230 FL100\/MEA-MORA\uff0c \u4f46\u53ea\u6709\u6700\u540e\u4e00\u79cd\u60c5\u51b5\u4e2d\uff0c\u4e5f\u5c31 … \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":[],"ppma_author":[5],"class_list":["post-3426","post","type-post","status-publish","format-standard","hentry","category-fly"],"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\/3426","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=3426"}],"version-history":[{"count":8,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/posts\/3426\/revisions"}],"predecessor-version":[{"id":3433,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/posts\/3426\/revisions\/3433"}],"wp:attachment":[{"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/media?parent=3426"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/categories?post=3426"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/tags?post=3426"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=3426"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}