יוגב.
בILS יש לך מה שנקרא CAT.
כל CAT נמדד בחומרת הראות שיש, לדוגמא ILS CAT1 זו מערכת שיש בישראל (אין צורך יותר מזה לרוב) שהיא מביאה אותך למסלול עד גובה מסויים ואתה לוקח שליטה לפי נהלי החברה משהו סטנדרתי לחלוטין.
ILS CAT2 זוהי מערכת שיש לה מינמיה נמוכה יותר כך שקורה מצב שהטייס צריך רק להציף בזמן.
ILS CAT 3 זוהי מערכת שהטייס לא מבצע כלום המטוס נוחת לבד ללא מגע של הטייס.
סרטון נחיתה של ILS CAT1
http://youtube.com/watch?v=ElFktHDuzFc&feature=related
סרטון נחיתה של ILS CAT3
http://youtube.com/watch?v=M3wnl1Ut--o
הנה קצת מידע על הקטגוריות של הILS (נלקח מוויקיפדיה)
ILS categories
There are three categories of ILS which support similarly named categories of operation.
Category I - A precision instrument approach and landing with a decision height not lower than 200 feet (61 m) above touchdown zone elevation and with either a visibility not less than 2,625 feet (800 m) or a runway visual range not less than 1,800 feet (550 m). An aircraft equipped with an Enhanced Flight Vision System may, under certain circumstances, continue an approach to CAT II minimums. [14 CFR Part 91.175 amendment 281]
Category II - Category II operation: A precision instrument approach and landing with a decision height lower than 200 feet (61 m) above touchdown zone elevation but not lower than 100 feet (30 m), and a runway visual range not less than 1,150 feet (350 m).
Category III is further subdivided
Category III A - A precision instrument approach and landing with:
a) a decision height lower than 100 feet (30 m) above touchdown zone elevation, or no decision height; and
b) a runway visual range not less than 655 feet (200 m).
Category III B - A precision instrument approach and landing with:
a) a decision height lower than 50 feet (15 m) above touchdown zone elevation, or no decision height; and
b) a runway visual range less than 2,625 feet (800 m) but not less than 165 feet (50 m).
Category III C - A precision instrument approach and landing with no decision height and no runway visual range limitations. A Category III C system is capable of using an aircraft's autopilot to land the aircraft and can also provide guidance along the runway surface.
In each case a suitably equipped aircraft and appropriately qualified crew are required. For example, Cat IIIc a fail-operational system is required, Cat I does not. A Head-Up Display which allows the pilot to perform aircraft maneuvers rather than an automatic system is considered as fail-operational. Cat I relies only on altimeter indications for decision height, whereas Cat II and Cat III approaches use radar altimeter to determine decision height.[2]
An ILS is required to shut down upon internal detection of a fault condition as mentioned in the monitoring section. With the increasing categories, ILS equipment is required to shut down faster since higher categories require shorter response times. For example, a Cat I localizer must shutdown within 10 seconds of detecting a fault, but a Cat III localizer must shut down in less than 2 seconds.[1
שחר חזקלביץ
טייס פרטי אמריקאי
מגדל בן גוריון, מגדל שדה דוב ומגדל הרצליה
