Mtsogoleri wakale wa National Transportation Safety Board - bungwe la US lomwe likufufuza za ngozi ya Lachinayi lapitalo la ndege yapaulendo yomangidwa ku Canada pafupi ndi Buffalo, NY - akuti ma turboprops onse ofananira a injini amapasa ayenera kuyimitsidwa, osachepera mpaka kafukufukuyo atatha.
"Ndikuganiza kuti chinthu chanzeru kuchita ... ndikuyendetsa ndege," mpaka kafukufuku wa bungweli atatha, atero a Jim Hall, wapampando wabungweli kuyambira 1994 mpaka 2001.
Kufufuza kotereku nthawi zambiri kumatenga miyezi 18 mpaka zaka ziwiri, ndipo zomwe Hall wapereka zingabweretse mavuto, chifukwa pali masauzande ambiri a ma passenger turboprop akutumikira padziko lonse lapansi.
Hall adati ndege zokhala ndi ma injini a turboprop zimauluka mwachangu kwambiri kuposa ma jeti, zomwe zimapangitsa kuti ayezi aunjike mosavuta. Analinso wotsutsa teknoloji ya turboprop de-icing - "nsapato" za rabara zodzaza mpweya zomwe zimakula ndi mgwirizano kuti zichotse madzi oundana, m'malo mwa mapiko otentha omwe amagwiritsidwa ntchito pa jets kuti ayezi asapangidwe.
Chiyambire kuwonongeka kwa Continental Connection 3407 kupha 50 m'dera la Buffalo ku Clarence Lachinayi lapitalo, icing yatchulidwa ngati yomwe ingayambitse, koma ofufuza za ngozi sananenebe izi mwalamulo.
Ndegeyo, yomwe ili ndi mipando 74 ya Bombardier Q400 turboprop yomangidwa ku Toronto ndipo idakhazikitsidwa mu Epulo watha, ikugwira ntchito padziko lonse lapansi; 219 akugwiritsidwa ntchito ndi onyamula 30, omwe ndi gawo la gulu lapadziko lonse lapansi la 880 Bombardier-build Q-series turboprops omwe akugwiritsidwa ntchito.
Koma pali mwayi wocheperako malingaliro a Hall adzachitika, popeza US Federal Aviation Administration, yomwe imayang'anira chitetezo cha ndege za anthu, ikukana upangiri wake.
"Pakali pano tilibe chidziwitso chomwe chingatipangitse kuti tiyimitse ndegeyi," Mneneri wa FAA Laura Brown adatero.
“Bungwe la FAA ndi makampani onse oyendetsa ndege agwira ntchito molimbika pazaka 15 zapitazi pofuna kuchepetsa ngozi zokhudzana ndi chipale chofewa ndipo ngozizo zatsika kwambiri chifukwa cha ntchitoyo.
"Ndege yomwe inakhudzidwa ndi ngoziyi ili ndi njira zamakono zodziwira madzi oundana ndi chitetezo zomwe zinapindula zaka zambiri zafukufuku ndi kusanthula momwe ndege zimagwirira ntchito ndikuchita munyengo yozizira," adatero Brown.
Ndege ya Porter Airlines ya ku Toronto imagwiritsa ntchito Q400 yokha ndipo dzulo Robert Deluce, pulezidenti wa ndege ndi mkulu wa ndege, adayamikira mbiri ya chitetezo cha ndegeyo komanso luso lamakono lochepetsera ndi anti-icing. "Ngati (gulu lachitetezo) likanakhala ndi nkhawa, kapena ngati FAA kapena Transport Canada kapena Bombardier ili ndi nkhawa zokhudzana ndi ndegeyo, yamtundu uliwonse, ikadayima pano," adatero.
"Koma izi sizikumveka ngati chilichonse chokhudzana ndi ndege. Izi zikumveka ngati zikugwirizana ndi nkhani zina zomwe sizinachitikebe. ”
Ofufuza za ngozi ati Flight 3407, yomwe imachokera ku Newark kupita ku Buffalo, idatsika ndikugudubuzika mwamphamvu isanadutse mazana angapo mnyumba Lachinayi usiku, kupha onse 49 omwe anali mgalimotoyo komanso bambo m'nyumbamo. Mmodzi wa ku Canada anafa pangoziyi. Dzulo anthu oposa 2,000 adachita nawo mwambo wokumbukira anthu omwe adazunzidwa ku US.
Oyendetsa ndege asanagwere adanenanso za "kuzizira kwakukulu," pamapiko ndi kutsogolo kwa ndegeyo.
Lamlungu, NTSB idanenanso kuti ndegeyo inali pamasekondi pang'ono isanagwe kuchokera kumwamba, zomwe zitha kuphwanya malamulo achitetezo aboma komanso malangizo oyendetsa ndege.
Mneneri wa FAA adati ndegeyo idaloledwa kuti ikhale yodziyendetsa yokha mopepuka komanso mocheperako. Njira yochepetsera ndegeyo itangonyamuka kumene ku Newark.
Hall adati icing ndiyomwe idayambitsa ngozi ya 1994 ya ndege ya ATR-72 ya twin turboprop ku Indiana.
William Voss, pulezidenti wa Flight Safety Foundation, anauza nyuzipepala ya Star m’mbuyomo kuti ndege imene inachita ngoziyi mu 1994 inali yodziyendetsa yokha ngoziyo isanachitike, zomwe zikanakulitsa mkhalidwewo.
Zomwe zidapangitsa ngoziyi Lachinayi sizikudziwika.
Hall adati nkhawa yake siili ndi Bombardier, koma ndi satifiketi ya ndege pamikhalidwe ina yake yowuluka, monga yomwe imatulutsa icing.
"Ndimalemekeza kwambiri chitetezo cha ndege ku Canada komanso opanga ndege iyi," adatero Hall. "Chodetsa nkhawa changa ndi kulephera kwa certification ku United States chifukwa cha ngozi za ndege zomwe zidapangidwanso, zomwe zinali ATR-72."
Q400 sinali pamsika mpaka 2000, koma Hall adati kufananaku kumafunikabe kufufuzidwa pachitetezo chonse cha ndege zokhala ndi mapasa.
Mneneri wa Bombardier a John Arnone adati kuyambira pomwe Q400 idayamba kuchita zamalonda mchaka cha 2000 ndege zomwe zikugwiritsidwa ntchito pano zadutsa maola opitilira 1 miliyoni komanso maulendo owuluka ndi 1.5 miliyoni.
"Ngozi yomvetsa chisoni yomwe ili pafupi ndi Buffalo idayimira anthu oyamba kufa mu ndege ya Q400," adatero.
Arnone adati sakudziwa zomwe zidachitika kale ndi icing.
Anatinso sizikudziwika chifukwa chake Hall adanenanso izi ndikuwonjezera kuti, "zowonadi, sizikusintha zomwe tikufuna ngati kampani pakadali pano," zomwe ndikuthandizira kafukufukuyu. Bombardier watumiza gulu la akatswiri achitetezo ndiukadaulo kuti akagwire ntchito ndi gulu lachitetezo, adatero.
