{"id":4950,"date":"2024-08-01T09:16:03","date_gmt":"2024-08-01T01:16:03","guid":{"rendered":"https:\/\/caucanimax.com\/blog\/?p=4950"},"modified":"2024-08-01T09:43:00","modified_gmt":"2024-08-01T01:43:00","slug":"why-taws-flap-mode-off-when-dual-fms-fault","status":"publish","type":"post","link":"https:\/\/caucanimax.com\/blog\/why-taws-flap-mode-off-when-dual-fms-fault\/","title":{"rendered":"A350 \u4e24\u90e8 FMS \u6545\u969c\u4e3a\u4ec0\u4e48\u8981\u5173 TAWS FLAP MODE"},"content":{"rendered":"

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

\u8fd9\u662f\u4e00\u4f4d\u8bfb\u8005 “\u540e\u8857\u6d0b\u828b” \u4e4b\u524d\u7684\u63d0\u95ee\uff0c\u7531\u4e8e\u4e2a\u4eba\u7ecf\u5e38\u60f3\u4e0d\u6e05\u695a\u903b\u8f91\u7c7b\u95ee\u9898\uff0c\u6240\u4ee5\u65ad\u65ad\u7eed\u7eed\u601d\u8003\u548c\u54a8\u8be2\u7a7a\u5ba2\uff0c\u5230\u6700\u8fd1\u624d\u786e\u5b9a\uff0c\u5b9e\u5728\u4e0d\u597d\u610f\u601d\u3002<\/p>\n

\u5728 AUTO FLT FMS 1+2 FAULT \u7a0b\u5e8f\u4e2d\uff0c\u8981\u5173\u95ed TAWS FLAPS MODE\uff1a<\/p>\n

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

\u4ece DSC-34-SURV-20-20 E TAWS – CONTROLS AND INDICATORS \u4e2d\u53ef\u77e5\uff0c\u8fd9\u4e2a\u6309\u94ae\u5c31\u662f\u6291\u5236 GPWS mode 4B \u7684 TOO LOW FLAPS \u8b66\u544a.<\/p>\n

<\/p>\n

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

 <\/p>\n

\u90a3\u95ee\u9898\u5c31\u53d8\u6210\u4e86\uff0c\u5728\u4e24\u90e8 FMS \u5931\u6548\u7684\u60c5\u51b5\u4e0b\uff0c\u4e3a\u4ec0\u4e48\u8981\u6291\u5236 GPWS MODE 4B \u7684 TOO LOW FLAPS \u8b66\u544a\uff1f\u4e00\u4e2a\u884d\u751f\u95ee\u9898\u662f\uff0c\u4e3a\u4ec0\u4e48\u8fd9\u4e2a\u6309\u94ae\u53ea\u6291\u5236 4B\uff0c\u800c\u4e0d\u7ba1 4A \u548c 4C \uff1f<\/p>\n

\u9996\u5148\u6765\u770b MODE 4 \u662f\u4ec0\u4e48\uff1f\u5728 DSC-34-SURV-20-10 B TAWS – SYSTEM DESCRIPTION B \u5bf9 MODE 4 \u6709\u63cf\u8ff0\uff0c\u5206\u4e3a A, B, C \u4e09\u4e2a\u5b50\u6a21\u5f0f\u3002\u5176\u4e2d MODE 4A \u548c MODE 4B \u662f\u7528\u4e8e\u8fdb\u8fd1\uff0c\u800c MODE 4C \u662f\u5bf9 MODE 3 \u7684\u8865\u5145\uff0c\u7528\u4e8e\u8d77\u98de\u548c\u722c\u5347\u9636\u6bb5\u3002<\/p>\n

1. 4A: LANDING GEAR UP AND<\/strong>\u00a0FLAPS NOT IN LANDING CONFIGURATION (MODE 4A)
\n2. 4B: LANDING GEAR DOWN AND<\/strong> FLAPS NOT IN LANDING CONFIGURATION, OR<\/strong>\u00a0LANDING GEAR UP AND<\/strong>\u00a0FLAPS IN LANDING CONFIGURATION (MODE 4B)
\n3. 4C: LANDING GEAR UP OR<\/strong> FLAPS NOT IN LANDING CONFIGURATION (MODE 4C)<\/p>\n

\u903b\u8f91\u5173\u7cfb\u5206\u89e3\u5982\u4e0b\uff08\u4e0d\u8003\u8651\u98de\u884c\u9636\u6bb5\uff09\uff1a<\/p>\n\n\n\n\n\n\n\n
Case<\/td>\nLanding Gear<\/td>\nFlap Configuration<\/td>\nMode 4A<\/td>\nMode 4B<\/td>\nMode 4C<\/td>\n<\/tr>\n
1<\/td>\nDown<\/td>\nLanding<\/td>\nNo<\/td>\nNo<\/td>\nNo<\/td>\n<\/tr>\n
2<\/strong><\/td>\nDown<\/strong><\/td>\nNot Landing<\/strong><\/td>\nNo<\/strong><\/td>\nYes<\/strong><\/td>\nYes<\/strong><\/td>\n<\/tr>\n
3<\/td>\nUp<\/td>\nLanding<\/td>\nNo<\/td>\nYes<\/td>\nYes<\/td>\n<\/tr>\n
4<\/td>\nUp<\/td>\nNot Landing<\/td>\nYes<\/td>\nNo<\/td>\nYes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

\u7a7a\u5ba2\u56de\u590d\u8bf4\uff0c\u4e0e\u895f\u7ffc\u4f4d\u7f6e\u76f8\u5173\u7684\u4fe1\u606f\u6709\u4e24\u4e2a\uff1a<\/p>\n

    \n
  1. HLS (High Lift System) \u7684\u5b9e\u9645\u895f\u7ffc\u4f4d\u7f6e<\/li>\n
  2. MFD PERF \u9875\u9762\u9009\u62e9\u7684\u7740\u9646\u6784\u578b<\/li>\n<\/ol>\n

    \u5bf9\u4e8e MODE 4B\uff0c\u5f53\u8fd9\u4e24\u4e2a\u4fe1\u606f\u4e0d\u5339\u914d\u65f6\uff0c\u5c31\u610f\u5473\u7740\u201c\u4e0d\u5728\u7740\u9646\u6784\u578b\u201d\u3002\u6bd4\u5982\u51fa\u73b0\u895f\u7f1d\u7ffc\u5361\u963b\u65f6\uff0c\u895f\u7ffc\u65e0\u6cd5\u653e\u5230 3 \u6216\u8005\u5168\uff0c\u5fc5\u7136\u4e0d\u5728\u7740\u9646\u6784\u578b\uff0c\u6240\u4ee5\u9700\u8981\u5173\u95ed FLAP MODE \u6309\u94ae\u3002<\/p>\n

    \u4e24\u90e8 FMS \u5931\u6548\u7684\u95ee\u9898\u5728\u4e8e\uff0c\u4f1a\u5bfc\u81f4 AESS \u63a5\u6536\u4e0d\u5230\u201c\u9009\u62e9\u7684\u7740\u9646\u6784\u578b\u201d\u3002\u5b9e\u9645\u6784\u578b\u653e\u5230 3 \u6216\u8005\u5168\u4e86\uff0c\u4f46 AESS \u4e0d\u77e5\u9053\u9009\u7684\u662f\u54ea\u4e2a\uff0c\u53ef\u80fd\u4f1a\u4ee5\u4e3a\u4e0e\u5b9e\u9645\u895f\u7ffc\u4f4d\u7f6e\u4e0d\u7b26\uff0c\u4ece\u800c\u89e6\u53d1 TOO LOW FLAP \u8b66\u544a\u3002\u6240\u4ee5\u4e5f\u9700\u8981\u5173\u95ed FLAP MODE \u6309\u94ae\u3002<\/p>\n

    \u800c MODE 4C \u5e76\u4e0d\u63a5\u6536 MFD \u4e2d\u201c\u9009\u62e9\u7684\u7740\u9646\u6784\u578b\u201d\uff0c\u53ea\u4f9d\u9760 HLS \u7684\u5b9e\u9645\u895f\u7ffc\u4f4d\u7f6e\uff0c\u6240\u4ee5\u4e0d\u5b58\u5728\u4e0d\u5339\u914d\u5bfc\u81f4\u5047\u8b66\u544a\u7684\u95ee\u9898\u3002<\/p>\n

    \u5173\u4e8e\u4e3a\u4ec0\u4e48\u4e0d\u628a MODE 4B \u4e5f\u8bbe\u8ba1\u6210\u53ea\u4f9d\u9760 HLS \u7684\u5b9e\u9645\u895f\u7ffc\u4f4d\u7f6e\u7684\u903b\u8f91\uff0c\u7a7a\u5ba2\u8868\u793a\uff0c\u4ece\u5b89\u5168\u89d2\u5ea6\u6765\u770b\uff0c\u89e6\u53d1 4B \u7684\u5047\u8b66\u544a\u5e76\u4e0d\u662f\u5f88\u5927\u7684\u5a01\u80c1\uff0c\u800c\u4fee\u6539\u903b\u8f91\u9700\u8981\u91cd\u65b0\u7684 AESS \u6807\u51c6\uff0c\u76ee\u524d\u5e76\u6ca1\u6709\u8fd9\u4e2a\u8ba1\u5212\u3002\u4e0d\u8fc7\u4ee5\u7a7a\u5ba2\u7684\u5c3f\u6027\uff0c\u8bf4\u4e0d\u5b9a\u54ea\u5929\u5c31\u6539\u4e86\u2026\u2026<\/p>\n

    \u81f3\u4e8e 4A\uff0c\u6211\u6ca1\u6709\u95ee\uff0c\u662f\u56e0\u4e3a\u5bf9\u4e8e\u8d77\u843d\u67b6\u6536\u4e0a\u7684\u60c5\u51b5\uff08\u53c2\u89c1\u4e0a\u8868 CASE3 \u548c CASE4\uff09\uff0c\u65e0\u8bba\u895f\u7ffc\u6784\u578b\u5982\u4f55\uff0c4A \u548c 4B \u90fd\u4f1a\u89e6\u53d1\u4e00\u4e2a\uff0c4C \u4e5f\u90fd\u4f1a\u89e6\u53d1\uff0c\u6240\u4ee5\u4e0d\u5b58\u5728\u8bef\u89e6\u53d1\u548c\u4e0d\u89e6\u53d1\u7684\u95ee\u9898\u3002<\/p>\n

     <\/p>\n

    \n

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

    Q1:<\/strong><\/p>\n

    In the procedure of AUTO FLT FMS 1+2 FAULT, [MFD SURV] TAWS FLAPS MODE is request to set OFF. According to FCOM description, this action can inhibit GPWS mode 4B.<\/p>\n

    Even loss of FMS position, TAWS can computes it’s own geometric position, the envelope of mode 4B will not change. So why do we need to set TAWS FLAPS MODE OFF?<\/p>\n

     <\/p>\n

    A1:<\/strong><\/p>\n

    In the Abnormal Procedure AUTO FLT FMS 1+2 FAULT, the TAWS FLAPS MODE is requested to set to OFF because in case of FMS 1+2 fault, the AESS (Aircraft Environment Surveillance System) cannot receive the Slats\/Flaps configuration selected for landing and may trigger spurious TOO LOW FLAPS alerts.<\/p>\n

     <\/p>\n

    Q2:<\/strong><\/p>\n

    In the TAWS (Terrain Awareness and Warning System) system description (DSC-34-SURV-20-10 B), MODE 4 is divided into three sub-modes: A, B, and C.<\/p>\n

    1. 4A: Landing gear up and flaps not in landing configuration
    \n2. 4B: Landing gear down and flaps not in landing configuration, or landing gear up and flaps in landing configuration
    \n3. 4C: Landing gear up or flaps not in landing configuration<\/p>\n

    From a logical perspective using “AND” and “OR” conjunctions, 4C’s “OR” condition encompasses both 4A and 4B:<\/p>\n

    Logical Comparison Table:<\/p>\n\n\n\n\n\n\n\n
    Case<\/td>\nLanding Gear<\/td>\nFlap Configuration<\/td>\nMode 4A<\/td>\nMode 4B<\/td>\nMode 4C<\/td>\n<\/tr>\n
    1<\/td>\nDown<\/td>\nLanding<\/td>\nNo<\/td>\nNo<\/td>\nNo<\/td>\n<\/tr>\n
    2<\/strong><\/td>\nDown<\/strong><\/td>\nNot Landing<\/strong><\/td>\nNo<\/strong><\/td>\nYes<\/strong><\/td>\nYes<\/strong><\/td>\n<\/tr>\n
    3<\/td>\nUp<\/td>\nLanding<\/td>\nNo<\/td>\nYes<\/td>\nYes<\/td>\n<\/tr>\n
    4<\/td>\nUp<\/td>\nNot Landing<\/td>\nYes<\/td>\nNo<\/td>\nYes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n

    In this table:<\/p>\n