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ทำไมต้องเปิดหน้าต่างทุกครั้งที่เครื่องบินขึ้น-ลง
By Joeadmin @ 9:57 AM :: 12210 Views ::  :: วิทยาศาสตร์รอบตัว(จาก สสวท.)
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 ท่านที่ใช้บริการเครื่องบินคงจะคุ้นเคยกับคำประกาศที่ว่า "ขณะนี้เครื่องบินกำลังจะวิ่งขึ้นแล้ว หรือเครื่องบินกำลังจะร่อนลงแล้ว ขอให้ผู้โดยสารทุกท่านเปิดหน้าต่างด้านข้างด้วย" เคยนึกสงสัยไหมว่าการเปิดหน้าต่างเครื่องบินขณะที่เครื่องบินกำลังบินขึ้นและขณะที่เครื่องบินกำลังร่อนลงเกี่ยวข้องอะไรกับการบิน และทำไมจึงต้องเปิดหน้าต่างเครื่องบินทุกครั้งที่เครื่องบินขึ้น-ลง
คุณจีรศักดิ์ นาคสีรุ่ง ผู้จัดการฝ่ายการฝึกบิน บริษัท สายการบินนกแอร์จำกัด อธิบายว่า หลายคนคงเคยสงสัยว่าเวลาเครื่องบินวิ่งขึ้นหรือร่อนลงทำไมจึงต้องเปิดหน้าต่าง จะเปรียบเทียบการขับเครื่องบินกับการขับรถยนต์เพื่อให้เห็นภาพชัดเจนขึ้น เนื่องจากรถยนต์มีขนาดไม่ใหญ่มากและมีกระจกมองข้าง ซ้าย-ขวา กระจกหน้า-หลัง ทำให้คนขับสามารถมองเห็นสิ่งต่างๆที่อยู่รอบข้างได้ แต่เครื่องบินมีขนาดใหญ่กว่ารถยนต์หลายเท่า ถึงจะมีนักบินที่ขับเครื่องบิน 2 คนนั่งอยู่ด้านหัวของเครื่องบินก็ไม่สามารถมองเห็นโดยรอบของเครื่องบินได้
จึงต้องให้ผู้โดยสารเปิดหน้าต่างเผื่อผู้โดยสารจะเห็นความบกพร่องของ เครื่องบิน เช่นอาจจะเห็นเครื่องยนต์บางตัวไม่ทำงาน ก็จะได้บอกกับพนักงานต้อนรับบนเครื่องบินเพื่อจะได้บอกให้นักบินทราบต่อไป ทั้งนี้ก็เพื่อความปลอดภัยของผู้โดยสารทุกท่าน
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หน้าต่างผู้โดยสารบนเครื่องบินทำจากแผ่นอะคริลิก (acrylic) ที่ถูกยืดออกเพื่อเพิ่มความแข็งแรงประกอบด้วย 3 ชั้นหลักๆ คือชั้นนอก ชั้นกลาง และชั้นใน โดยชั้นนอกและชั้นกลางจะยึดติดกันด้วยแถบยาง ชั้นในมีไว้เพื่อป้องกันผู้โดยสารทำความเสียหายกับวัสดุชั้นกลาง ไม่ได้มีไว้เพื่อความปลอดภัยและไม่มีความสำคัญใดๆต่อโครงสร้าง แม้แต่การเกิดรอยขีดข่วนก็ไม่ได้ทำให้ความแข็งแรงของหน้าต่างลดน้อยลง แต่จะทำให้คุณภาพในการมองทะลุผ่านกระจกด้อยลงมาก จากเหตุนี้เองจึงทำให้ต้องเปลี่ยนกระจกหน้าต่างทุก 3 ปี
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