{"id":5451,"date":"2026-06-04T19:48:47","date_gmt":"2026-06-04T11:48:47","guid":{"rendered":"https:\/\/caucanimax.com\/blog\/?p=5451"},"modified":"2026-06-04T19:48:48","modified_gmt":"2026-06-04T11:48:48","slug":"question-about-flap-setting-in-unreliable-air-speed-indication","status":"publish","type":"post","link":"https:\/\/caucanimax.com\/blog\/question-about-flap-setting-in-unreliable-air-speed-indication\/","title":{"rendered":"\u4e3a\u4ec0\u4e48\u4e0d\u53ef\u9760\u7a7a\u901f\u8bb0\u5fc6\u9879\u76ee\u4e2d\u895f\u7ffc\u5168\u8981\u6536\u5230 3"},"content":{"rendered":"<p>\u611f\u8c22\u540c\u4e8b\u7684\u95ee\u9898\u3002<\/p>\n<p><a href=\"https:\/\/caucanimax.com\/blog\/question-about-flap-setting-in-unreliable-air-speed-indication\/question-about-flap-setting-in-unreliable-air-speed-indication_image_1\/#main\" rel=\"attachment wp-att-5452\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-5452\" src=\"http:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2026\/06\/Question-about-FLAP-setting-in-UNRELIABLE-AIR-SPEED-INDICATION_image_1.png\" alt=\"\" width=\"549\" height=\"271\" srcset=\"https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2026\/06\/Question-about-FLAP-setting-in-UNRELIABLE-AIR-SPEED-INDICATION_image_1.png 1382w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2026\/06\/Question-about-FLAP-setting-in-UNRELIABLE-AIR-SPEED-INDICATION_image_1-300x148.png 300w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2026\/06\/Question-about-FLAP-setting-in-UNRELIABLE-AIR-SPEED-INDICATION_image_1-1024x506.png 1024w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2026\/06\/Question-about-FLAP-setting-in-UNRELIABLE-AIR-SPEED-INDICATION_image_1-768x380.png 768w\" sizes=\"auto, (max-width: 549px) 100vw, 549px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>\u4e0d\u53ef\u9760\u7a7a\u901f\u8bb0\u5fc6\u9879\u76ee\u7684\u7a0b\u5e8f\u4e2d\uff0c\u5982\u679c\u6784\u578b\u662f 0-3 \u5219\u4fdd\u6301\uff0c\u5982\u679c\u662f\u5168\u5c31\u8981\u6536\u5230 3\u3002\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u4fdd\u6301\u6784\u578b\u5168\u5462\uff1f<\/p>\n<p><!--more--><\/p>\n<p>\u7a7a\u5ba2\u7684\u89e3\u91ca\u662f\uff0c\u6700\u521d\u5728 A320\/A330 \u7cfb\u5217\u98de\u673a\u4e0a\uff0c\u4e0d\u53ef\u9760\u7a7a\u901f\u7a0b\u5e8f\u662f\u4e3a\u8d77\u98de\u3001\u722c\u5347\u548c\u5de1\u822a\u9636\u6bb5\u8bbe\u8ba1\u7684\u3002\u4e0d\u53ef\u9760\u7a7a\u901f\u60c5\u51b5\u4e3b\u8981\u7531\u7ed3\u51b0\u6761\u4ef6\u5bfc\u81f4\uff0c\u5728\u722c\u5347\u8fc7\u7a0b\u4e2d\u6216\u66f4\u5e38\u89c1\u4e8e\u9ad8\u7a7a\u5e73\u98de\u65f6\u63a2\u5934\u88ab\u5835\u585e\u6240\u5f15\u8d77\u3002\u5728\u8fd9\u4e9b\u60c5\u51b5\u4e0b\uff0c\u8bbe\u8ba1\u7406\u5ff5\u662f\u4fdd\u6301\u98de\u673a\u5f53\u524d\u673a\u7ffc\u6784\u578b\u4e0d\u53d8\uff0c\u5e76\u6839\u636e\u4fef\u4ef0\/\u63a8\u529b\u8868\u8bbe\u7f6e\u76f8\u5e94\u7684\u4fef\u4ef0\u4e0e\u63a8\u529b\u7ec4\u5408\u503c\u3002<\/p>\n<p>\u7136\u800c\uff0c\u6709\u8fd0\u8425\u5546\u62a5\u544a\u4e86\u4e00\u6b21\u5728\u6700\u540e\u8fdb\u8fd1\u9636\u6bb5\uff08\u7ea6 800 \u82f1\u5c3a\u65e0\u7ebf\u7535\u9ad8\u5ea6\uff09\u53d1\u751f\u7684\u4e0d\u53ef\u9760\u7a7a\u901f\u4e8b\u4ef6\uff0c\u5f53\u65f6\u98de\u673a\u5904\u4e8e FULL \u6784\u578b\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u673a\u7ec4\u65e0\u6cd5\u4f7f\u7528\u4fef\u4ef0\/\u63a8\u529b\u8868\uff0c\u56e0\u4e3a\u8be5\u8868\u672a\u63d0\u4f9b 3 \u4ee5\u4e0a\u6784\u578b\u7684\u6570\u503c\u5bf9\u3002\u4e3a\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898\uff0c\u7a7a\u5ba2\u51b3\u5b9a\u66f4\u65b0\u201c\u4e0d\u53ef\u9760\u7a7a\u901f\u6307\u793a\/ADR \u68c0\u67e5\u7a0b\u5e8f\u201d\u7684\u8bb0\u5fc6\u9879\u76ee\uff0c\u4fee\u6539\u5982\u4e0b\uff1a\u5f53\u6784\u578b\u4e3a 0\u30011\u30012\u30013 \u65f6\uff0c\u5e94\u4fdd\u6301\u5f53\u524d\u6784\u578b\uff1b\u5f53\u6784\u578b\u4e3a FULL \u65f6\uff0c\u5e94\u9009\u62e9\u5e76\u4fdd\u6301\u6784\u578b 3\u3002\u56e0\u6b64\uff0c\u5f53\u5728 FULL \u6784\u578b\u4e0b\u53d1\u751f\u4e0d\u53ef\u9760\u7a7a\u901f\u60c5\u51b5\u65f6\uff0c\u673a\u7ec4\u5fc5\u987b\u6536\u56de\u4e00\u6863\uff0c\u4ee5\u4fbf\u80fd\u591f\u4f7f\u7528\u4fef\u4ef0\/\u63a8\u529b\u8868\u3002<\/p>\n<p>\u81f3\u4e8e\u4e3a\u4ec0\u4e48\u5e94\u5bf9\u63aa\u65bd\u662f\u5c06\u6784\u578b FULL \u6536\u5230 3\uff0c\u800c\u4e0d\u662f\u589e\u52a0\u6784\u578b FULL \u5bf9\u5e94\u7684\u4fef\u4ef0\/\u63a8\u529b\u5462\uff1f\u7a7a\u5ba2\u89e3\u91ca\u7531\u4e8e\u6784\u578b\u5168\u963b\u529b\u592a\u5927\uff0c\u5728\u4e0d\u53ef\u9760\u7a7a\u901f\u60c5\u51b5\u4e0b\uff0c\u6027\u80fd\u4e0d\u8db3\u4ee5\u6309\u7167\u4fef\u4ef0\/\u63a8\u529b\u6765\u4fdd\u6301\u98de\u673a\u72b6\u6001\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u7a7a\u5ba2\u8fd8\u63d0\u5230\uff0c\u5bf9\u4e8e A350\uff0c\u5728\u4e0d\u53ef\u9760\u7a7a\u901f\u60c5\u51b5\u4e0b\uff0cPRIM \u4f1a\u81ea\u52a8\u6267\u884c\u5927\u6c14\u6570\u636e\u6e90\u91cd\u6784\u529f\u80fd\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5b8c\u5168\u6ca1\u6709\u5907\u7528\u7a7a\u901f\u6e90\u7684\u53ef\u80fd\u6027\u88ab\u8ba4\u4e3a\u6781\u4f4e\u3002\u56e0\u6b64\u5728 A350 \u4e0a\uff0c\u901a\u5e38\u4f1a\u4f7f\u7528\u5907\u7528\u7a7a\u901f\u800c\u4e0d\u662f\u4f9d\u8d56\u4fef\u4ef0-N1 \u8868\u3002\u5c3d\u7ba1 A350 \u5177\u6709\u8fd9\u79cd\u7279\u5b9a\u8bbe\u8ba1\uff0c\u7a7a\u5ba2\u4ecd\u51b3\u5b9a\u4fdd\u7559\u4e0e A330 \u76f8\u540c\u7684\u8bb0\u5fc6\u7a0b\u5e8f\uff0c\u4ee5\u4fbf\u4e8e\u901a\u7528\u578b\u522b\u7b49\u7ea7\u8bad\u7ec3\uff0c\u5e76\u4fdd\u6301\u673a\u961f\u4e4b\u95f4\u7684\u5171\u901a\u6027\u3002<\/p>\n<p>\u6211\u5bf9\u8fd9\u89e3\u91ca\u7684\u5ef6\u7533\u7406\u89e3\u662f\uff0c\u5982\u679c\u4e0d\u8003\u8651\u591a\u673a\u578b\u7edf\u4e00\u7a0b\u5e8f\uff0c\u5355\u4ece\u6280\u672f\u4e0a\u6765\u8bb2\uff0cA350 \u5b8c\u5168\u53ef\u4ee5\u5728\u4e0d\u53ef\u9760\u7a7a\u901f\u7684\u65f6\u5019\u76f4\u63a5\u8f6c\u6362 AIR DATA \u65cb\u94ae\uff0c\u98de BKUP SOURCE\u3002\u5176\u5b9e\u5c31\u7b97\u98de\u8bb0\u5fc6\u9879\u76ee\uff0c\u98de\u673a\u7a33\u5b9a\u540e\u8c03\u51fa[ABN]\u7a0b\u5e8f\uff0c\u5c31\u662f\u8981\u6c42\u8f6c\u6362 AIR DATA\uff0c\u4e00\u6837\u7684\u3002<\/p>\n<p>&nbsp;<\/p>\n<hr \/>\n<p><strong>TR-81719682 \u539f\u6587<\/strong><\/p>\n<p><strong>Q1<\/strong><\/p>\n<p>What is the reason of \u201cFLAPS (if CONF FULL)\u2026. SELECT CONF 3 AND MAINTAIN\u201d in [MEM] UNRELIABLE AIR SPEED INDICATION, instead of maintain CONF FULL?<\/p>\n<p><strong>A1<\/strong><\/p>\n<p>Please be informed that initially, in A320\/A330 family aircrafts, the Unreliable Airspeed procedure was designed for Takeoff, Climb and Cruise phases. The Unreliable Airspeeds situations are mainly due to icing conditions that cause probes obstructions during climb or mainly during level flight at high altitude. In these situations, the Airbus philosophy is to keep the aircraft in the current wing shape configuration and set the applicable pitch\/thrust value pair as per pitch\/thrust table.<\/p>\n<p>However, an operator reported an Unreliable Airspeed event during final approach (800ft RA) with the aircraft configuration set at FULL. In this case, the flight crew was <span style=\"color: red;\">unable to use the pitch\/thrust table<\/span> since no value pairs are given for configuration above 3. To address this situation, Airbus decided to update the UNRELIABLE SPEED INDICATION\/ADR CHECK PROC memory items as follows:<\/p>\n<ul>\n<li>When the configuration is 0, 1, 2, 3, the configuration must be maintained.<\/li>\n<li>When the configuration is at full, the configuration 3 must be selected and maintained. Therefore, when an Unreliable Airspeed situation occurs and the aircraft configuration is at FULL, the flight crew must retract one step to be able to use the pitch\/thrust table.<\/li>\n<\/ul>\n<p>However, in A350, during the unreliable airspeed situation, there is an automatic reconfiguration function of the air source done by PRIM. It is considered very unlikely to not have a backup source in this case. So normally, in A350, we will use backup airspeed in case of unreliable airspeed than using the pitch\/thrust table (i.e. Pitch-N1 table). Despite the specific design of the A350, we decided to <span style=\"color: red;\">keep a memory procedure common<\/span> with the A330 for common type rating training and maintain the commonality between fleets.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Q2<\/strong><\/p>\n<p>Thank you for Airbus\u2019s detailed explanation.<\/p>\n<p>I am curious as to why, following an unreliable airspeed event at 800ft RA, the procedure calls for retracting the configuration from FULL to CONF 3, rather than adding the pitch\/thrust data corresponding to CONFIG FULL.<\/p>\n<p>Is this procedure more convenient, or are there limitations in CONFIG FULL that prevent providing pitch\/thrust data?<\/p>\n<p><strong>A2<\/strong><\/p>\n<p>Please be informed that when the aircraft is in CONF FULL, the <span style=\"color: red;\">associated drag is important<\/span>. However, during the unreliable airspeed indication, the aircraft <span style=\"color: red;\">might not have<\/span> sufficient performance to maintain the aircraft with the requesting pitch\/thrust. Therefore, if the aircraft is in CONF FULL, the procedure request to select flap to CONF 3 and maintain.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u611f\u8c22\u540c\u4e8b\u7684\u95ee\u9898\u3002 &nbsp; \u4e0d\u53ef\u9760\u7a7a\u901f\u8bb0\u5fc6\u9879\u76ee\u7684\u7a0b\u5e8f\u4e2d\uff0c\u5982\u679c\u6784\u578b\u662f 0-3 \u5219\u4fdd\u6301\uff0c\u5982\u679c\u662f\u5168\u5c31\u8981\u6536\u5230 3\u3002 &#8230; <a title=\"\u4e3a\u4ec0\u4e48\u4e0d\u53ef\u9760\u7a7a\u901f\u8bb0\u5fc6\u9879\u76ee\u4e2d\u895f\u7ffc\u5168\u8981\u6536\u5230 3\" class=\"read-more\" href=\"https:\/\/caucanimax.com\/blog\/question-about-flap-setting-in-unreliable-air-speed-indication\/\" aria-label=\"\u9605\u8bfb \u4e3a\u4ec0\u4e48\u4e0d\u53ef\u9760\u7a7a\u901f\u8bb0\u5fc6\u9879\u76ee\u4e2d\u895f\u7ffc\u5168\u8981\u6536\u5230 3\">\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-5451","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\/5451","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=5451"}],"version-history":[{"count":2,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/posts\/5451\/revisions"}],"predecessor-version":[{"id":5454,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/posts\/5451\/revisions\/5454"}],"wp:attachment":[{"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/media?parent=5451"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/categories?post=5451"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/tags?post=5451"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=5451"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}