Anthu khumi ndi mmodzi amwalira usiku watha ku Oahu, pamene ndege ya Beech 65-A90 inagwa atangonyamuka ku Dillingham Airfield ondi North Shore ya Oahu, Hawaii. Imawerengedwa kuti ndi ngozi yowopsa kwambiri yoyendetsa ndege ku U.S. State of Hawaii pazaka makumi awiri zapitazi.
Zikuoneka kuti ndegeyo ili ndi mavuto ambiri. Mu 2016 a National Transportation Safety Board (NTSB) adalemba lipoti lotsatirali la zomwe zidachitika pomwe ndegeyi idagwiritsidwa ntchito ku California.
Pa July 23, 2016, pafupifupi 1900 Pacific masana nthawi, Beech 65-A90, N256TA, inawonongeka kwambiri pambuyo polephera kulamulira pamene ikukwera pafupi ndi Byron Airport (C83) Byron, California. Woyendetsa zamalonda ndi okwera 14 sanavulale. Ndegeyo idalembetsedwa ku N80896 LLC, ndipo imayendetsedwa ndi Bay Area Skydiving pansi pa zomwe 14 Code of Federal Regulations Part 91. Zinthu zowoneka bwino za meteorological zinalipo ndipo palibe ndondomeko yowuluka yomwe idaperekedwa paulendo wopita kumlengalenga. Ndege yakomweko idanyamuka ku C83 pafupifupi 1851.
Malinga ndi woyendetsa ndegeyo, pamene ndegeyo inayandikira malo odumphira omwe anakonzedwa komanso kutalika kwake, pafupifupi 12,500 ft, kutanthauza mlingo wa nyanja, adayambitsa njira yopita kumanzere kuti apite kumalo otsika. Ananenanso kuti liwiro la ndegeyo linali locheperako ndipo "mwadzidzidzi ndegeyo idayima, ndikugudubuzika kumanzere, ndikuyamba kuzungulira mphuno." Ananenanso kuti ndegeyo "inachita maulendo angapo otsika pansi." Mmodzi mwa odumphirawo, amene anakhala pampando woyendetsa ndegeyo, anamva “kugunda kwakukulu” mkati mwa njira yochirayo ndipo ananena kuti “woyendetsa ndegeyo sanachedwetse kugunda kwamphamvu panthaŵi yochira, zomwe zinachititsa kuti ndegeyo izithamanga kwambiri.” Wodumphirayo adanenanso kuti pakuchira adamva mphamvu ya g pamimba pake. Woyendetsa ndegeyo adanena kuti adabwezeretsanso ndegeyo kwakanthawi kochepa kuti ikhale ndi mapiko kwa masekondi angapo ndipo adawona kuti ndegeyo inali pafupi ndi 90 ° kuchoka pamutu womwe unakonzedweratu, ndipo imathamanga pang'onopang'ono.
Pambuyo pake, woyendetsa ndegeyo ananena kuti panali “kugwedezeka” kwa zowongolera ndipo “nthawi yomweyo ndegeyo inasweka molimba kumanzere,” inaimanso kachiwiri, ndipo inayamba kuzungulira pansi. Woyendetsa ndegeyo anauza osambira m’mlengalenga kuti adumphe m’ndegemo. Oyendetsa ma parachuti adamvera, ndipo onse adatuluka bwino mundege panthawi yachiwiriyi. Woyendetsa ndegeyo adayambitsa njira zobwezeretsanso kuti asawonekere chifukwa cha kuzungulira kwa 9 ndipo adanena kuti chiwerengerocho chinali chofulumira kwambiri kuposa chochitika choyamba chozungulira. Kenako adakokera zowongolera zonse ziwiri pamalo pomwe nthengayo idatuluka ndipo adatha kutuluka pozungulira. Anabwezeretsanso ndegeyo kuti ikhale yolimba, koma posakhalitsa, ndegeyo "inasweka kumanzere" ndikuyima kachitatu. Woyendetsa ndegeyo anabwezanso ndegeyo mwa kuchepetsa kutsika kwake ndi kuwonjezera liwiro.
Woyendetsa ndegeyo anabwerera ku bwalo la ndege ndipo popeza ndegeyo inkayenda molakwika, anasintha chowongolera cha elevator kuti mphuno yake ikhale mmwamba kuti imuthandize kuti asauluke molunjika. Ananenanso kuti njira yodulira mphuno yonse idagwiritsidwa ntchito. Kuphatikiza apo, woyendetsa ndegeyo adawuluka njira 15 mwachangu kuposa momwe amafunikira, kuti athe kubweza kuwongolera kwa kuchepa kwakukulu kwa magwiridwe antchito a chikepe.
Woyendetsa ndegeyo anafotokoza kuti kuterako kunali kochepa kwambiri poyerekeza ndi kutera bwinobwino. Atatera pa C83, mboni inawona kuti chowongolera chakumanja cha ndegeyo, chokhala ndi chikepe cholumikizidwa, chinali kusowa. Magawo a ndege olekanitsidwa pambuyo pake adayikidwa pabwalo lomwe lili pamtunda wa makilomita angapo kumwera kwa eyapoti.
Woyendetsa ndegeyo adanena kuti panalibe vuto lililonse ndi ndege paulendo wam'mbuyomu tsiku lomwelo, kapena pakuwunika kwake asananyamuke paulendo wangozi. Iye ananena kuti kunja kunali koyera ndipo kunali kowala. Komanso, iye adanena kuti palibe vuto la injini panthawi ya ndege.
Kuwunika kwa ndege pambuyo pa ngozi kunawonetsa kuti zikopa zam'mwamba ndi zapansi za mapiko zinali zosadabwitsa. Ma injini okwera ndi kumanzere kopingasa zokhazikika zolumikizira adawunikidwa kuti azitha kupanikizika, koma palibe chomwe chidawonedwa. Palibe zizindikiro za flutter zomwe zidawonedwa kumanzere kopingasa stabilizer.
Chokhazikika chokhazikika chokhazikika, chokhala ndi elevator, chomwe chidalekanitsidwa ndi ndege, chidawunikidwa. Ma elevator oyenerera ndi tabu yochepetsera zikepe idakhalabe yolumikizidwa ndi malo awo olumikizidwa. Zing'onozing'ono zinkawoneka pamphepete mwachitsulo chachikulu ndi chotsatira chopingasa kumanja kopingasa kokhazikika. Panali makwinya pakhungu. Chomangira cholumikizira chomwe chimalumikiza chokhazikika chopingasa kumanja ku ndege, ndi chokhazikika china chopingasa, chimawonetsa malo osweka mbali yakumanja pomwe chokhazikika chakumanja chopingasa.
Magawo a chokhazikika chopingasa chakumanja, elevator, ndi bulaketi yolumikizira adatumizidwa ku National Transportation Safety Board Materials Laboratory kuti akawunikenso. Kuwunika kowoneka bwino kwapang'onopang'ono kunawonetsa zinthu zomwe zimagwirizana ndi kupatukana kwa overstress. Palibe chosonyeza kutopa kapena dzimbiri chomwe chinawonedwa. Kupindika ndi kusweka kwa ma spars okhazikika okhazikika kumanja kunali kuwonetsa nsonga yokhazikika yopindika mmwamba ndipo spar yakumunsi inalinso ndi kung'ambika kwa ukonde.
Buku lofotokoza za mmene ndege imayendera pouluka imati: “Nthawi yomweyo sunthani mzere wowongolera kutsogolo, ikani chiwongolero chonse moyang’anizana ndi kumene imazungulira, ndipo chepetsani mphamvu pa injini zonse ziwirizo kuti zisagwire ntchito. Zochita zitatuzi ziyenera kuchitidwa pafupi nthawi imodzi momwe mungathere, kenaka pitirizani kugwira ntchitoyi mpaka kuzungulira kuyimitsidwa ndikuchepetsa zowongolera zonse ndikutulutsa kosalala. Ailerons akuyenera kusalowerera ndale akachira. ”
Kulemera kwa ndegeyo komanso kuchuluka kwake kunawerengeredwa paulendo wangozi. Pakatikati pa mphamvu yokoka (CG) amayerekezedwa kukhala pafupifupi mayunitsi 6-7 kutsatizana ndi malire. Chifukwa chapakati pa mphamvu yokoka (cg) kukhala aft ya malire, kulemera kwakukulu kovomerezeka sikunathe kudziwika panthawi ya ngozi. Malingana ndi FAA Pilot Handbook of Aeronautical Knowledge inanena kuti, “m’mene CG imayenda m’mwamba, pamakhala vuto linalake losakhazikika, lomwe limachepetsa mphamvu ya ndegeyo kudziikira yokha ikangoyenda kapena chipwirikiti.”
