[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-205530-105":59,"doc-detail-205530-en":131},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":124,"head_meta":126,"extra_data":128,"updated_unix":130},105,"en","boac-hermes-iv-forcmay1d5d","BOAC HERMES IV - ForcMay1d5d","","Report No.23 documents the circumstances of a BOAC Hermes IV flight from Tripoli to Kano with eight crew and ten passengers. Forecasted good weather en route turned into thunderstorms near Kano, while severe radio communication difficulties were attributed to atmospheric conditions. A faulty variation-setting use on the Gyrosyn compass and failure to determine position correctly led to a wheels-up landing in a desert depression. The aircraft did not break up, no fire occurred, and all evacuated; six passengers were slightly injured, but the First Officer died five days later from exhaustion and heat.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/boac-hermes-iv-forcmay1d5d/205530/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/boac-hermes-iv-forcmay1d5d/205530.png","ImageObject",300,407,{"name":92,"@type":93},"นรินทร์","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-18","2026-09-05",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",13,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What caused the aircraft to land wheels-up in the desert depression?","Question",{"text":113,"@type":114},"A faulty variation-setting use on the Gyrosyn compass prevented the crew from determining the aircraft’s position properly by standard methods, leading to the incorrect track and landing scenario.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"How did weather and radio conditions affect the accident?",{"text":118,"@type":114},"Thunderstorm conditions caused atmospheric effects that greatly hampered radio communications, producing serious difficulties for both the aircraft radio operator and ground stations.",{"name":120,"@type":111,"acceptedAnswer":121},"What were the evacuation and casualty results?",{"text":122,"@type":114},"No fire resulted; all passengers and crew were evacuated without difficulty. Six were slightly injured, and the First Officer died five days later due to exhaustion from strain and heat.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},205530,1788580890,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":29,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":130,"read_time":144,"preview_page_count":4},2336475104957,"https://ap-avatar.wpscdn.com/avatar/22000c4c6bd8a5076e1?x-image-process=image/resize,m_fixed,w_180,h_180&k=1787554080175789136","No.23  \nBOAC HERMES IV.ForcMay1d5d in French West Africa  \n(Note.-The inquiry was conducted by France in accordancewith Annex 13 of the Convention of ICAO)  \nCircum stances  \nThe aircraft took off on a scheduled service from Tripoli to Kano with a crew of eightand ten passengers.The weather forecast indicated fine weather en route and thunderstormsin the Kano area.Due to faulty use of the variation setting control on the Gyrosyn compassand the inability of the crew to determine the aircraft's position properly by the standardmethods,the aircraft,with practically no fuel and over the desert,made a wheels-up landingin a wide depression littered with shifting sand-dunes surrounded by rocky escarpments.Theport wing was torn off and the remainder of the aircraft slewed left and came to a standstillwithout breaking up.No fire resulted and all passengers and crew were evacuated withoutdifficulty.Six were slightly injured but the First Officer died five days later as a result ofexhaustion brought about by strain and heat.  \nInvestigation and Evidence  \nThe weather forecast for the flight,drawn up by the meteorological office at CastelBenito,indicated fine weather en route and thunderstorms in the Kano area.On the whole,reports of actual weather received from the aircraft during flight bore out the forecast.Thereport adds that weather conditions had no direct bearing on the accident,apart from the factthat thundery conditions caused atmospherics which greatly hampered radio communications,  \nGround facilities available for the flight included(in British territory)non-directionalbeacons and radio direction-finding at Accra,Castel Benito,Jos,Kano,Lagos and Wheelus,radio responder beacons at all the airports mentioned with the exception of Jos,and radiorange at Wheelus.Ground aids primarily available in French territory included the following:  \nAtar(non-directional beacon and MF/DF),Bomako(MF/DF),Dakar(radio range,non-directional beacon,MF/HF DF,responder beacon,locator beacon and approachcontrol),Gao(non-directional beacon and MF/HF DF),Niamey(non-directional beacon,MF/DF and locator beacon),Port Etienne(non-directional beacon,MF and HF/DF),Tunis(non-directional beacon,radio range and HFMF and VHF direction finders),Secondarily,and only on request or on several hours'prior notice,further aids wereavailable at other airfields in French territory.Airborne navigational aids carried bythe aircraft were as follows:  \n(radio)Marconi HF standard STR VHF,Marconi ADF,RAF homing andapproach,Ultra intercom:(navigational)Hughes periscopic sextant,buttlesextant MK.9B,CL2 Sperry Gyrosyn compass,P.12 refiecting magnetic compass,and drift-meter.In addition to the appropriate maps,charts and operating manuals,the aircraft carried a start chart,airspeed correction table,Air Almanac(May-August,1952),rapid navigational tables and star tables for air navigation.  \nOutlining the ground aids used in the flight and discussing their efficiency,the report saysthat the identification signal on the Gao beacon was received but the strength was not sufficientto allow a bearing to be taken.The Port Etienne beacon and DF aids at Bamako,Port Etienneand Dakar,however,had provided a large number of valuable position data and bearings.Thestation at Tamanrasset had acted on its own initiative as a relay between the aircraft and Kano,but was not asked for a bearing;the radio oper.ator had even entered an interrogation mark inhis log against this(to him)unknown station-which was nevertheless shown on the airbornenavigation chart.The investigator comments that \"the scarcity of radio facilities on theTripoli-Kano desert route casts celestial navigation for an important role on this sector andshould,at all events,prompt the fullest possible utilization of the conveniently contactableradio facilities at the point of take-off\".  \nThe investigator continues:\"We note,howevex,the existence of available radio facili-ties which were not utilized,in particular those at Tripoli,use of w","cbCaiqtNl9e1WS4B","https://ap.wps.com/l/cbCaiqtNl9e1WS4B","pdf",778713,"English","# Circumstances of the Flight\n## Weather and Landing Outcome\n# Investigation and Evidence\n## Ground and Airborne Navigation Aids\n## Radio Communication Difficulties and Compass Discrepancy\n# Operational Decisions and Position Fixes","[{\"question\":\"What caused the aircraft to land wheels-up in the desert depression?\",\"answer\":\"A faulty variation-setting use on the Gyrosyn compass prevented the crew from determining the aircraft’s position properly by standard methods, leading to the incorrect track and landing scenario.\"},{\"question\":\"How did weather and radio conditions affect the accident?\",\"answer\":\"Thunderstorm conditions caused atmospheric effects that greatly hampered radio communications, producing serious difficulties for both the aircraft radio operator and ground stations.\"},{\"question\":\"What were the evacuation and casualty results?\",\"answer\":\"No fire resulted; all passengers and crew were evacuated without difficulty. Six were slightly injured, and the First Officer died five days later due to exhaustion from strain and heat.\"}]","BOAC HERMES IV - ForcMay1d5d | PDF",15]