Kuwonongeka kwa ndegeyi kuyenera kukhala chenjezo kwa oyendetsa ndege kulikonse pa nkhani zingapo, kuphatikizapo kuchoka, ngozi zowuluka usiku , kuthamanga kupita kumtunda , VFR / IFR zotsegula, ndi udindo wa akatswiri operekera ndege kuti apereke malangizo ndi malangizo kuthawa.
Malingana ndi lipoti la ngozi ya NTSB , ndege za Hawker Siddeley DH.125-1A / 52 (zakale za Hawker 800) zinagwera m'phiri atachoka ku Brown Field Municipal Airport pa March 16, 1991. Awiri oyendetsa ndege ndi anthu asanu ndi atatu m'ndende anaphedwa, kuphatikizapo mamembala asanu ndi awiri ndi mtsogoleri wa gulu la nyenyezi ya Reba McEntire. McEntire, pamodzi ndi mwamuna wake, amenenso anali mtsogoleri wake, adaganiza kuti azigona usiku wonse ku San Diego asanatuluke m'mawa mwake.
Ndegeyi iyenera kugwiritsidwa ntchito paulendo waulendo waulendo kuchokera ku Brown Field, womwe uli kunja kwa malo a chigawo cha San Diego, ku Amarillo, Texas, yomwe ingakhale ngati mafuta osapitirira.
Chodabwitsa, woyendetsa ndegeyo adalankhula ndi katswiri wa maulendo othawa ndege nthawi imodzi koma katatu pofuna kuyesa kuchoka ku eyapoti.
Pakati pa kukambirana koyamba ndi katswiri wa utumiki wa ndege, woyendetsa ndegeyo adawombera ndege ya IFR. Anali pafupi nthawi ya 11:20 madzulo, ndipo woyendetsa ndegeyo anafunsa za kuchoka pa eyapoti pansi pa VFR ndikunyamulira chikalata chake cha IFR kamodzi kokha.
Briefer anapempha woyendetsa ndegeyo ngati akudziŵa zoyendetsa, ndipo woyendetsa ndegeyo adanena, "Ayi, osati kwenikweni." Katswiri wa zamtundu wa ndege adayesa kuyang'ana njira zoyendera kuti atumize uthenga kwa woyendetsa ndegeyo, ndipo kumeneko chinali chisokonezo chokhudza m'mene mungapezere njira. Woyendetsa ndege kapena briefer sanathe kuwapeza mofulumira. Woyendetsa ndegeyo potsirizira pake adatsimikiza kuti angayang'ane njira yomwe amadzilembera yekha.
Cha m'ma 11:53 madzulo woyendetsa ndegeyo adayitananso katswiri wa utumiki wouthawa ndipo adanena kuti sanathe kupeza njira yoyendetsera njira yomwe amachokera. Pakukambirana, adakambidwa kuti SID inali mu gawo la STAR (ofalitsa ofika) omwe ali m'buku la njira zotha kugwiritsira ntchito, ndipo njirazo zinawerengedwa kwa woyendetsa ndegeyo. Woyendetsa ndegeyo adanena kuti ndizo zonse zomwe amafunikira ndipo foniyo inatha.
Foni yachitatu inapangidwira ku ofesi ya ndege yoyendetsa ndege pa 12:28 m'mawa ndi woyendetsa ndege, ndipo nthawiyi woyendetsa ndegeyo anafunsa kugwiritsa ntchito njira yakuchoka ku IFR yomwe ingamutengere ku malire a B. Woyendetsa ndegeyo adadziwa kuti pogwiritsa ntchito chida choyendetsa ndege ngati VFR, akhoza kukhala m'chipinda cham'mbali B asanavomereze, zomwe zikanakhala zovuta chifukwa chivomerezo chiyenera kulowa m'gulu la A B.
Pa foni yomalizira, woyendetsa ndege adafunsa katswiri wokhudzana ndi njirayi, kumukumbutsa kuti akufuna kuchoka VFR ndikuganiza kuti ayenera kuchoka kumpoto chakum'maŵa ndi kukhala VFR pansi pa mapazi atatu. Briefer anavomera, kunena "Eya, zedi, izo zidzakhala bwino."
Ngakhalenso katswiri wa zouluka ndege kapena woyendetsa ndege sanaganizire za malo omwe akukwera chakum'mawa kwa bwalo la ndege, ndipo palibe amene adanena kuti malo ochepa omwe ali pamtunda wa ndege (MSA) kummawa kwa ndege, poyendayenda, inali mamita 7,600 - pamwamba pa Kutalika kwa mamita 3,000 pamene woyendetsa ndegeyo anasankha kuti aziwuluka. Mphepete mwa nyanja ya VFR yotetezeka ya chigawo chimenecho inali 6,900 mapazi.
Woyendetsa ndegeyo adachoka ku Runway 8 ku Brown Field nthawi ya 1:41 am. Nyengo ya pa ndege yoyandikana nayo inanenedwa bwino, kuonekera kunali makilomita 10, ndipo mphepo inali bata.
Mboni zinanena kuti mitambo iyenera kuti inali pafupi ndi mamita 4,000 pafupi ndi ngoziyi. Mphindi imodzi yokha itatha, ndegeyo inagwirizana ndi pempho la IFR ndipo inauzidwa kuti chilolezo chake chinali chitatsekedwa, koma kudikirira ndi woyang'anira akubwezeretsanso. Ndege inagwera m'mapiri a San Isidro pamwamba pamtunda pafupifupi mamita 3,300 patangopita nthawi yochepa kuti atumizidwe ndi squawk code ndi ATC. Chimake cha mapiri, malinga ndi VFR, chimakhala pafupi mamita 3,550.
Malingana ndi ofufuza, mapiko a ndege anakwera pamwamba pa phiri, ndipo ankakwera maulendo angapo, akubalalitsa ming'alu m'malo ambiri. Lipoti la NTSB linapeza chifukwa chowopsya cha ngoziyi: "Kukonzekera kosayenera / chisankho cha woyendetsa ndegeyo, kulephereka kwa woyendetsa ndege kuti akhalebe malo okwera bwino ndi malo ovomerezeka kudera la mapiri, ndipo kulephera kwa woyang'anirayo kumayang'ana bwino kayendetsedwe ka ndege. Zochitika zokhudzana ndi ngoziyi ndizo: Zomwe sadziwa zambiri zapadera zomwe zimaperekedwa ndi katswiri wothandiza anthu oyendetsa ndege pamsonkhano wa apolisi pambuyo poti woyendetsa ndegeyo adafunsa za kutsika kwapansi, mdima, madera a mapiri, kusowa kwa woyendetsa ndege kumudzi, komanso kusowa kwa kapepala kudziwa bwino ndege. "
Ngoziyi ndi nkhani yowonetsera kuti oyendetsa ndege azikhala osamala pamene achoka ku VFR kapena IFR usiku, makamaka m'dera lomwe simukudziwa. Ngati oyendetsa ndegewa adatenga nthawi kuti apeze chigamulo cha IFR pansi, kapena atenge kamphindi kuti ayang'ane mbali yochepa ya chigawo (MSA) pa njira ya IFR kapena tchati yochoka kapena ndondomeko ya VFR ingapulumutse miyoyo 10 usiku umenewo.
Pambuyo pa ngoziyi, apolisi anafunsa woyendetsa ndegeyo kuti azindikire chifukwa chake oyendetsa ndegeyo sanadziwe za malo oyandikana nawo, ngakhale atatha kuwuluka ku eyapoti masana. Malingana ndi lipoti ili lochokera ku flightsafety.org, ofufuzawo anapempha mwiniwake wa Duncan Aircraft Sales, yemwe anali kugwira ntchito ndegeyi, ngati oyendetsa ndegeyo anali ndi zigawo za VFR. Yankho lake, mwinamwake sichidabwitsa, mwinamwake likuyimira chikhalidwe chosasamala cha chitetezo: "Ichi ndi chovala chachabechabechabe, sitimanyamula VFR chati."