{"id":4137,"date":"2023-05-10T14:57:35","date_gmt":"2023-05-10T06:57:35","guid":{"rendered":"https:\/\/caucanimax.com\/blog\/?p=4137"},"modified":"2023-05-10T14:57:35","modified_gmt":"2023-05-10T06:57:35","slug":"perf-computing-for-wet-runway-and-idle-rev","status":"publish","type":"post","link":"https:\/\/caucanimax.com\/blog\/perf-computing-for-wet-runway-and-idle-rev\/","title":{"rendered":"\u6e7f\u8dd1\u9053\u4f7f\u7528\u5c0f\u53cd\u63a8\u7684\u6027\u80fd\u8ba1\u7b97\u8981\u6c42"},"content":{"rendered":"<p>\u5728 SOP \u7684\u8fdb\u8fd1\u51c6\u5907\u4e2d\uff0c\u5173\u4e8e\u7740\u9646\u6027\u80fd\u8ba1\u7b97\u6709\u4e00\u4e9b\u6ce8\u91ca\uff0c\u5176\u4e2d\u4e00\u6761\u4e0d\u597d\u7406\u89e3\uff1a<\/p>\n<p><a href=\"https:\/\/caucanimax.com\/blog\/perf-computing-for-wet-runway-and-idle-rev\/question-about-landing-performance-computing_image_1\/\" rel=\"attachment wp-att-4138\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-4138\" src=\"http:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_1-1024x651.png\" alt=\"\" width=\"640\" height=\"407\" srcset=\"https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_1-1024x651.png 1024w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_1-300x191.png 300w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_1-768x488.png 768w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_1-150x95.png 150w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_1-400x254.png 400w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_1.png 1284w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<blockquote><p>\u5728\u6e7f\u8dd1\u9053\u4e0a\uff0c\u5982\u679c\u673a\u7ec4\u51b3\u5b9a\u4f7f\u7528\u5c0f\u53cd\u63a8\uff0c\u5219\u9700\u8981\u4f7f\u7528\u4ee5\u4e0b\u6761\u4ef6\u6765\u8ba1\u7b97\uff1a<\/p>\n<ul>\n<li>\u9053\u9762\u6761\u4ef6 MEDIUM TO POOR<\/li>\n<li>\u4e0d\u9009\u62e9\u53cd\u63a8<\/li>\n<\/ul>\n<p>\u5982\u679c\u8ba1\u7b97\u51fa\u6765\u7684\u8ddd\u79bb\u5c0f\u4e8e LDA\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528\u5c0f\u53cd\u63a8\u3002<\/p><\/blockquote>\n<p><!--more--><\/p>\n<p>\u6309\u7167 FCTM PR-NP-SOP-160 SOP &#8211; DESCENT PREPARATION \u4e2d\u7684\u63cf\u8ff0\uff0c\u5982\u679c\u8981\u4f7f\u7528\u5c0f\u53cd\u63a8\uff0c\u5e94\u8be5\u9009\u62e9 &#8220;NO REV&#8221;\uff0c\u8fd9\u4e2a\u662f\u53ef\u4ee5\u7406\u89e3\u7684:<\/p>\n<p><a href=\"https:\/\/caucanimax.com\/blog\/perf-computing-for-wet-runway-and-idle-rev\/question-about-landing-performance-computing_image_2\/\" rel=\"attachment wp-att-4139\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-4139\" src=\"http:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_2-1024x245.png\" alt=\"\" width=\"640\" height=\"153\" srcset=\"https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_2-1024x245.png 1024w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_2-300x72.png 300w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_2-768x184.png 768w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_2-150x36.png 150w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_2-400x96.png 400w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_2.png 1362w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>\u4f46\u95ee\u9898\u662f\uff1a<\/p>\n<p><strong>\u672c\u8eab&#8221;\u9053\u9762\u6761\u4ef6 GOOD + NO REV&#8221; \u5c31\u5df2\u7ecf\u6bd4&#8221;\u9053\u9762\u6761\u4ef6 GOOD + REV IDLE\u201d \u4e25\u683c\u4e86\uff0c\u4e3a\u4ec0\u4e48\u8fd8\u8981\u518d\u9009\u62e9\u201c\u9053\u9762\u6761\u4ef6 MEDIUM TO POOR\u201d\u5462\uff1f<\/strong><\/p>\n<p>\u7a7a\u5ba2\u56de\u590d\u4e86\u5f88\u591a\uff0c\u6838\u5fc3\u89c2\u70b9\u5c31\u662f\uff0c<span style=\"color: #ff0000;\">\u673a\u573a\u90e8\u95e8\u662f\u5f88\u96be\u5b9e\u65f6\u89c2\u5bdf\u9053\u9762\u79ef\u6c34\u662f\u5426\u8d85\u8fc7 3mm \u7684\uff0c\u4e5f\u5c31\u662f&#8221;WET&#8221;\u548c&#8221;STANDING WATER&#8221; \u7684\u4e34\u754c\u503c\uff0c\u540c\u65f6\u4e5f\u662f\u9053\u9762\u6761\u4ef6&#8221;GOOD&#8221;\u548c&#8221;MEDIUM TO POOR&#8221;\u7684\u4e34\u754c\u503c<\/span>\u3002\u5bf9\u4e8e\u79ef\u6c34\u6765\u8bf4\uff0c\u5c0f\u4e8e\u7b49\u4e8e 3mm RWYCC \u5c31\u662f 5\uff0c\u5927\u4e8e 3mm \u5c31\u662f 2\uff0c\u4e2d\u95f4\u7684 4 \u548c 3 \u662f\u9488\u5bf9\u96ea\u7684\uff0c\u548c\u79ef\u6c34\u65e0\u5173\u3002\u591a\u6b21\u4e8b\u4ef6\u62a5\u544a\u4e5f\u8868\u660e\uff0c\u5728\u62a5\u544a&#8221;WET&#8221;\u7684\u9053\u9762\u4e0a\uff0c\u673a\u7ec4\u5e76\u6ca1\u6709\u611f\u53d7\u5230\u6b63\u786e\u7684\u5239\u8f66\u80fd\u529b\u3002<\/p>\n<p><strong>\u6240\u4ee5\uff0c\u4e3a\u4e86\u5b89\u5168\u8d77\u89c1\uff0c\u5982\u679c\u8981\u5728\u6e7f\u8dd1\u9053\u4e0a\u4f7f\u7528\u5c0f\u53cd\u63a8\uff0c\u9664\u4e86\u5bf9\u201c\u5c0f\u53cd\u63a8\u201d\u8fdb\u884c\u4fdd\u5b88\u8ba1\u7b97\u4e3a\u201c\u65e0\u53cd\u63a8\u201d\uff0c\u8fd8\u8981\u5bf9\u201c\u6e7f\u8dd1\u9053\u201d\u8fdb\u884c\u4fdd\u5b88\u8ba1\u7b97\u4e3a&#8221;STANDING WATER&#8221;\uff0c\u6240\u4ee5\u5408\u5728\u4e00\u8d77\u5c31\u662f\u6309\u7167&#8221;\u9053\u9762\u6761\u4ef6 MEDIUM TO POOR + NO REV&#8221;\u6765\u8ba1\u7b97\u3002<\/strong><\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728\u4e0a\u8ff0 FCTM PR-NP-SOP-160 SOP &#8211; DESCENT PREPARATION \u6587\u4e2d\u6240\u8bf4\u7684\uff0c\u662f LDA \u8981\u5927\u4e8e <strong>unfactored LD<\/strong>\uff0c\u4e5f\u5c31\u662f\u4e0d\u52a0\u4e0a 15% \u7684\u7740\u9646\u8ddd\u79bb\uff0c\u800c\u4e0d\u662f F-LD\u3002<\/p>\n<p><a href=\"https:\/\/caucanimax.com\/blog\/perf-computing-for-wet-runway-and-idle-rev\/question-about-landing-performance-computing_image_3\/\" rel=\"attachment wp-att-4140\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-4140\" src=\"http:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_3-1024x367.png\" alt=\"\" width=\"640\" height=\"229\" srcset=\"https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_3-1024x367.png 1024w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_3-300x108.png 300w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_3-768x275.png 768w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_3-150x54.png 150w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_3-400x143.png 400w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_3.png 1322w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/caucanimax.com\/blog\/perf-computing-for-wet-runway-and-idle-rev\/question-about-landing-performance-computing_image_4\/\" rel=\"attachment wp-att-4141\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone  wp-image-4141\" src=\"http:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_4-880x1024.jpg\" alt=\"\" width=\"272\" height=\"317\" srcset=\"https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_4-880x1024.jpg 880w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_4-258x300.jpg 258w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_4-768x893.jpg 768w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_4-129x150.jpg 129w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_4-400x465.jpg 400w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_4.jpg 1035w\" sizes=\"auto, (max-width: 272px) 100vw, 272px\" \/><\/a><\/p>\n<p>\u53ef\u80fd\u4f1a\u51fa\u73b0\u63d0\u793a\u4fe1\u606f\uff1a<\/p>\n<p><a href=\"https:\/\/caucanimax.com\/blog\/perf-computing-for-wet-runway-and-idle-rev\/question-about-landing-performance-computing_image_5\/\" rel=\"attachment wp-att-4143\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-4143\" src=\"http:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_5-1024x129.png\" alt=\"\" width=\"640\" height=\"81\" srcset=\"https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_5-1024x129.png 1024w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_5-300x38.png 300w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_5-768x97.png 768w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_5-150x19.png 150w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_5-400x51.png 400w, https:\/\/caucanimax.com\/blog\/wordpress\/wp-content\/uploads\/2023\/05\/Question-about-landing-performance-computing_image_5.png 1378w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<hr \/>\n<p><strong>TechRequest \u539f\u6587<\/strong><\/p>\n<p><strong>Q:<\/strong><\/p>\n<p>In PRO-NOR-SOP-160 A LANDING PERF DATA COMPUTE, the description of WET runways computation seems not inaccurate.<\/p>\n<p>For WET runway with REV IDLE, &#8220;MEDIUM TO POOR landing performance level&#8221; and &#8220;No reverser credit&#8221; should not be chose at the same time. Because only &#8220;GOOD with No reverser&#8221; is already more strict than &#8220;GOOD with REV IDLE&#8221;. No need to further downgrade to &#8220;MEDIUM TO POOR&#8221;.<\/p>\n<p>I think it should be &#8220;MEDIUM TO POOR with REV MAX&#8221; OR &#8220;GOOD with NO REVERSER&#8221;. And verified in FLY SMART, they stop margin of those two are very close.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>A:<\/strong><\/p>\n<p>Please find below the recommendation given in A350 FCOM PRO-NOR-SOP-160 &#8220;Descent Preparation&#8221;:<\/p>\n<p>&#8220;Note:<\/p>\n<p>2.The selection of REV MAX is the standard practice for landing.<\/p>\n<p>However, on DRY runways the flight crew may select REV IDLE.<\/p>\n<p>On WET runways (runway surface condition GOOD), the flight crew may select REV IDLE, if all of the following conditions are satisfied:<\/p>\n<ul>\n<li>A landing distance assessment has been made with the following parameters for the in-flight landing distance computation:\n<ul>\n<li>MEDIUM TO POOR landing performance level<\/li>\n<li>No reverser credit.<\/li>\n<\/ul>\n<\/li>\n<li>The result of this in-flight landing distance assessment is within the LDA&#8221;<\/li>\n<\/ul>\n<p>The first point that Airbus would like to highlight is that Airbus recommendation is to use REV MAX for landing.<\/p>\n<p>For In-Flight Landing computation, the performance on WET runway (up to 3 mm of water) should be computed with Runway Condition Code 5 (GOOD) when using REV MAX.<\/p>\n<p>However, following operators&#8217; requests, Airbus has performed a study to give the possibility to use REV IDLE instead of REV MAX on WET runway.<\/p>\n<p>In this case, the flight crew must follow the safety precautions as described in the note reminded above: the flight crew must check that the in-flight landing distance computed with Runway Condition Code 2 (MEDIUM TO POOR) and no reverser credit is within the LDA (Landing Distance Available).<\/p>\n<p>Such safety precautions have been defined <span style=\"color: #ff0000;\">based on Airbus experience<\/span>. The aim is to protect against a <span style=\"color: #ff0000;\">degraded<\/span> runway condition, as it is <span style=\"color: #ff0000;\">very difficult for airports to observe in real time<\/span> the potential accumulation of water on the runway <span style=\"color: #ff0000;\">above<\/span>\u00a0a depth of 3mm, where the runway condition <span style=\"color: #ff0000;\">moves from WET to Standing Water<\/span>\u00a0(i.e. from GOOD to MEDIUM TO POOR).<\/p>\n<p>In several in-service events, the flight crew <span style=\"color: #ff0000;\">did not have a correct perception<\/span>\u00a0of the braking capability on a runway reported to be WET.<\/p>\n<p>The use of REV MAX is a major mitigation of such unexpected degraded conditions.<\/p>\n<p>When landing with REV IDLE is planned, the exposure to a runway excursion is increased. Thus, Airbus has developed this guidance to ensure a good safe margin for such operations.<\/p>\n<p>Therefore, Airbus would like to confirm that, even if WET runway is Runway Condition Code 5 (GOOD), the in-flight landing performance must be computed without the reverser credit and with MEDIUM TO POOR landing performance level in case of landing with REV IDLE on a WET runway.<\/p>\n<p>If the in-flight landing distance calculated is higher than the LDA, then landing with REV MAX must be performed.<\/p>\n<p>Please note that additional information is given in FCTM PR-NP-SOP-160 &#8220;Descent Preparation&#8221; \/ &#8220;Landing Performance&#8221; \/ &#8220;USE OF REVERSE THRUST&#8221; :<\/p>\n<blockquote><p>&#8220;The flight crew may use idle reverse in wet conditions, when it is ensured that a safe stop with spoilers and wheel braking alone can be made on a runway contaminated with standing water. The LDA should therefore exceed the unfactored LD without reverse for the braking action corresponding to standing water (RWYCC 2, Braking Action Medium to Poor).&#8221;<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 SOP \u7684\u8fdb\u8fd1\u51c6\u5907\u4e2d\uff0c\u5173\u4e8e\u7740\u9646\u6027\u80fd\u8ba1\u7b97\u6709\u4e00\u4e9b\u6ce8\u91ca\uff0c\u5176\u4e2d\u4e00\u6761\u4e0d\u597d\u7406\u89e3\uff1a \u5728\u6e7f\u8dd1\u9053\u4e0a\uff0c\u5982\u679c\u673a\u7ec4\u51b3\u5b9a\u4f7f\u7528\u5c0f\u53cd\u63a8\uff0c &#8230; <a title=\"\u6e7f\u8dd1\u9053\u4f7f\u7528\u5c0f\u53cd\u63a8\u7684\u6027\u80fd\u8ba1\u7b97\u8981\u6c42\" class=\"read-more\" href=\"https:\/\/caucanimax.com\/blog\/perf-computing-for-wet-runway-and-idle-rev\/\" aria-label=\"\u9605\u8bfb \u6e7f\u8dd1\u9053\u4f7f\u7528\u5c0f\u53cd\u63a8\u7684\u6027\u80fd\u8ba1\u7b97\u8981\u6c42\">\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-4137","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\/4137","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=4137"}],"version-history":[{"count":2,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/posts\/4137\/revisions"}],"predecessor-version":[{"id":4146,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/posts\/4137\/revisions\/4146"}],"wp:attachment":[{"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/media?parent=4137"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/categories?post=4137"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/tags?post=4137"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/caucanimax.com\/blog\/wp-json\/wp\/v2\/ppma_author?post=4137"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}