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AIR NAVIGATION

AIR NAVIGATION. Air navigation introduction Pilotage and dead reckoning Maps and charts Mission planning Dead reckoning with basic instruments Lines of position, bearing and fix Map reading Time Use of flight computer. Importance things before getting start. LATITUDE AND LONGITUDE

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AIR NAVIGATION

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  1. AIR NAVIGATION

  2. Air navigation introduction Pilotage and dead reckoning Maps and charts Mission planning Dead reckoning with basic instruments Lines of position, bearing and fix Map reading Time Use of flight computer

  3. Importance things before getting start • LATITUDE AND LONGITUDE • TIME ZONES • MEASUREMENT OF DIRECTION • EFFECT OF WIND • THE WIND TRIANGLE OR VECTOR ANALYSIS • VARIATION • ISOGONIC AND AGONIC LINE • DEVIATION • TRUE AND MAGNETIC VALUES

  4. LATITUDE AND LONGITUDE • The degrees of latitude are measured north or south of the Equator. (1 minute of latitude = one nautical mile) • The degrees of longitude are measuredeast or west of the Prime meridian.

  5. TIME ZONES • The meridians are also useful for designating time zones. • A day is defined as the time required for the Earth to make one complete rotation of 360º. • Since the day is divided into 24 hours, the Earth revolves at the rate of 15º an hour. • The standard practice is to establish a time zone for each 15º of longitude. This makes a difference of exactly 1 hour between each zone.

  6. TIME ZONES • Noon is the time when the Sun is directly above a meridian; to the west of that meridian is morning, to the east is afternoon.

  7. TIME • The time of the day • Zulu time • Local time • An elapsed interval

  8. Local Time +E -W Local Time = UTC Local Conversion Factor • To findLocal Conversion Factor= a + b + c • a. Degree of Longitude ÷15 = Hours (leftovers not count ) • b. Leftovers ×4 = Minutes • c. Minutes of Longitude × 4 ÷ 60 = Seconds

  9. Giving :GMT 0200 hrs, 30 June, local longitude 68 º 21’ E. Find : Local Time a. 68 ÷15 = 4 leftovers8= 4 Hours b. 8 × 4 = 32Minutes c. 21 ×4 ÷60 = 1.4 Minutes or 1Minute24Seconds Local Conversion Factor= a + b + c = 4 Hours33Min.24Sec. +E -W Local Time = UTC Local Conversion Factor = 02:00 +04:33:24 = 06:33:24

  10. Local time 2000 hrs, 15 February, local long 135º 00’ W. What is UTC a.      1100 hrs, 15 February. b.      1100 hrs, 16 February. c.      0500 hrs, 15 February. d. 0500 hrs, 16 February. +E -W Local Time = UTC Local Conversion Factor UTC = Local Time Local Conversion Factor = 2000 + 9 hrs = 2900 = 2400 + 0500 (next day) - E +W

  11. Practice : Giving :GMT 1900 hrs, 25 Oct, local longitude 101º 42’ E. Find : Local Time a. 101 ÷15 = 6 leftovers11= 6 Hours b. 11 × 4 = 44Minutes c. 42 ×4 ÷60 = 2.8 Minutes or 2Minute48Seconds Local Conversion Factor= a + b + c = 6 Hours46Min.48Sec. +E -W Local Time = UTC Local Conversion Factor = 19:00 + 06:46:48 = 25:46:48 = 01:46:48 / 26 Oct

  12. MEASUREMENT OF DIRECTION • By using the meridians, direction from one point to another can be measured in degrees, in a clockwise direction from true north. • To indicate a course to be followed in flight, draw a line on the chart from the point of departure to the destination and measure the angle which this line forms with a meridian.

  13. MEASUREMENT OF DIRECTION • Because meridians converge toward the poles, course measurement should be taken at a meridian near the midpoint of the course rather than at the point of departure. • The course measured on the chart is known as the true course (TC).

  14. MEASUREMENT OF DIRECTION • As shown, the direction from A to B would be a true course of 065º, whereas the return trip (called the reciprocal) would be a true course of 245º

  15. EFFECT OF WIND • The airplane will fly faster with a tailwind or slower with a headwind, or to drift right or left with a crosswind.

  16. COURSE is the intended path of an airplane over the ground; or the direction of a line drawn on a chart. (Desired Course) • HEADING is the direction in which the nose of the airplane points during flight. • TRACK is the actual path made over the ground in flight. (If proper correction has been made for the wind, track and course will be identical.) • DRIFT ANGLE is the angle between heading and track.

  17. WIND CORRECTION ANGLEis correction applied to the course to establish a heading so that track will coincide with course. • True course correct for the wind = True heading TC – WCA = TH

  18. EFFECT OF WIND TO A/S • Assuming no correction is made for wind effect, if the airplane is heading eastward at 120 knots, and the air mass moving southward at 20 knots • In this situation, the A/S remains 120 knots, but the G/Swhich is computed by the time required to fly between two points of a known distance apart is not 120 knots. • The G/S can be determined by constructing a wind triangle.

  19. THE WIND TRIANGLE ORVECTOR ANALYSIS • The wind triangle is a graphic explanation of the effect of wind upon flight. Groundspeed, heading, and time for any flight can be determined by using the wind triangle.

  20. THE WIND TRIANGLE OR VECTOR ANALYSIS Example : Flight from E to P at A/S of 120 kias, TC = 090º wind from 045º. Find : G/S, TH and WCA

  21. THE WIND TRIANGLE OR VECTOR ANALYSIS Finding True heading (TH) by direct measurement

  22. THE WIND TRIANGLE OR VECTOR ANALYSIS Finding True heading (TH) by the wind correction angle (WCA) If the wind blows from the right of true course, the angle will be added; if from the left, it will be subtracted. ( -L +R WCA )

  23. Variation • Because courses are measured in reference to true north, but these courses are maintained by reference to the compass which points to magnetic north. • So the true direction must be converted into magnetic direction for the purpose of flight.

  24. Variation • The angular difference between true north and magnetic north from any given position on the earth’s surface is Variation. • You can find the actual value of the variation angle on the chart. It is marked by a dashed magenta line.

  25. Isogonic and Agonic Line • The amount and the direction of variation, which change slightly from time to time, are shown on most aeronautical charts as broken magenta lines, called isogonic lines, which connect points of equal magnetic variation. • The line connecting points at which there is no variation between true north and magnetic north is the agonic line.

  26. Variation • To convert true course or heading to magnetic course or heading, note the variation shown by the nearest isogonic line. If variation is west, add; if east, subtract. • One method for remembering whether to add or subtract variation is the phrase “east is least (subtract) and west is best (add).” • Example : True course (TC) 295º, Variation 11ºW Magnetic course (MC) = 295º + 11º = 306º

  27. Effect of Variation on the compass

  28. Deviation • Compass deviation is unique to each individual airplane and is the result of compass interference caused by metals and electrons in the vicinity of the wet compass. • Magnetic heading correct for Deviation = Compass Heading • A compass deviation card is located very near the wet compass so that pilots may correct their magnetic heading for that error.

  29. Deviation The deviation card will typically read something like this: Using this example, to fly a magnetic heading of 301 degrees, we would need to fly a compass heading of 304 degrees.

  30. True and Magnetic Values • Course and Heading • Course is always the line draw on the chart. • Heading is always a direction measured relative to the longitudinal axis of the air plane. • True course correct for the wind = True heading • Magnetic course correct for the wind = Magnetic heading

  31. C D M V T The method used by many pilots to determine compass heading: After the true course (TC) is measured, and wind correction applied resulting in a true heading (TH), the sequence C D M V T is used.

  32. C D M V T C = Compass Heading 291º D = Deviation +1 M = Magnetic Heading/Course 290º V = Varition 5E T = True Heading/Course 295º

  33. Practice : A pilot is planning to fly to destination which required a course on a chart of 165º and variation value close to the course line is 3ºW, with a given deviation card, what is the compass heading he has to fly (assuming no wind). C = Compass Heading 167º D = Deviation -1 M = Magnetic Heading/Course 168º V = Varition 3W T = True Heading/Course 165º

  34. Navigation Introduction • Word NAVIGATION came from two Latin words: • NAVIS: ship • AGERE: to direct or move • Navigation means finding your way. • Navigation is the art and science of getting from point "A" to point "B" in the least possible time without losing your way.

  35. Navigation Introduction • Air Navigation means knowing where you are (in the air), where you want to go, and having a good idea of how much time and fuel it will take to get there.

  36. The type of navigation used by pilots depends on many factors. • Where the pilot is going. • How long the flight will take. • When the flight is to take off. • The type of aircraft being flown. • The on-board navigation equipment. • The ratings and currency of the pilot. • The expected weather.

  37. Pilotage and dead reckoning • The two most fundamental methods of finding your way in an airplane are Pilotage and Dead Reckoning. • These two methods normally are used together, each acting as a cross-check of the other.

  38. Pilotage • Is the identification of present position and direction of flight by seeing features on the ground. • Pilotage is mainly used by pilots of small, low speed aircraft who compare symbols on aeronautical charts with surface features on the ground in order to navigate.

  39. Pilotage disadvantages • Poor visibility caused by inclement weather can prevent a pilot from seeing the needed landmarks and cause the pilot to become disoriented and navigate off course. • A lack of landmarks when flying over the more remote areas can also cause a pilot to get lost.

  40. Using pilotage for navigation can be as easy as following a highway or a railroad.

  41. Three basic tasks of pilotage navigation are : • Create a course • Fly on course • Make position check

  42. before take-off, pilot will making pre-flight planning by drawing a line on the aeronautical map to indicate the desired course. • Then notes various landmarks , such as highways , railroad tracks, rivers , bridges. • As the pilot flies over each of landmark , he will checks it off on the chart or map. • If the plane does not pass directly over the landmark, he will know that he has to correct the course.

  43. PilotageThings To Consider • Line of Position (LOP) • LOP is the simple concept that the airplane is locate somewhere along a specific line. • LOP doesn’t establish the exact position, but rather a line of possible positions. • The intersection of two different LOP is a FIX

  44. I just crossed fix 3. Fix 3 B Fix 2 Fix 1 I am someplacebetween point A and B. A PilotageThings To Consider • Line of Position

  45. PilotageThings To Consider • Course Considerations B A

  46. PilotageThings To Consider • Checkpoints B A

  47. Checkpoints Note • The checkpoints selected should be prominent features common to the area of the flight. • Choose checkpoints that can be readily identified by other features such as roads, rivers, railroad tracks, lakes, and power lines. • If possible, select features that will make useful boundaries or brackets on each side of the course, such as highways, rivers, railroads, and mountains.

  48. Pilotage Tip • Never place complete reliance on any single checkpoint. Choose ample checkpoints. If one is missed, look for the next one while maintaining the heading. • If confused, hold the heading. If a turn is made away from the heading, it will be easy to become lost. • Aeronautical charts display the best information available at the time of printing, but a pilot should be cautious for new structures or changes that have occurred since the chart was printed.

  49. Dead reckoning (DR) • DR is the navigation procedure to plot and fly a course based solely on mathematical calculations . • "You're Dead if you don't Reckon properly."

  50. Dead reckoning • DR is the process of estimating your position by advancing a known position using course, speed, time and distance to be traveled. • In other words figuring out where you will be at a certain time if you hold the speed, time and course you plan to travel.

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