|
TABLE OF CONTENT
[ ] TO DEVELOP THE STUDENT'S KNOWLEDGE OF USING
THE MAGNETIC COMPASS AND COMPASS BEHAVIOR FOR IFR FLIGHT.
Review of applicable instructions and publications.
-Review Mag Compass Use :10
-Review Mag Compass Behavior :30
-AIM
- Instrument
Flight Handbook (chapters 1 - 7)
- Instrument
Flight Handbook (chapters 8 and beyond)
-POH for the aircraft
-Discuss Lesson Objectives
-Review Reference Publications with the Student
-Review Mag Compass use during IFR flight
--Timed Turns: One needle width is a standard rate turn of 3
degrees per second. A 60 degree turn would take twenty seconds.
1/2 std rate turn is 1 1/2 degrees per second. Then a 60 degree
turn would take 40 seconds.
--Turns to Headings: Because of dip errors, and with an angle
of bank between 13 and 18 degrees, the amount of lead or lag
to be used when turning to northerly or southerly headings varies
with, and is approximately equal to, the latitude of the locality
over which the turn is being made. For example, when turning
from an easterly direction to north, where the latitude is 30
degrees, start the roll-out when the compass reads 37 degrees,
(30 plus one half of the 15 degree angle of bank).
-Review Mag Compass Behavior
--Mag Dip: increasing downward curvature of mag lines of force
at the poles.
--Mag Var: Difference between mag north and true north.
--Deviation: affect from aircraft's mag fields.
--Northerly Turning Error: Most pronounced of the dip errors.
While the card is in the banked attitude, the vertical component
of the Earth's mag field causes the north seeking ends of the
compass to dip to the low side of the turn, giving an erroneous
turn indication. When making a turn from a heading of north,
the compass briefly gives and indication of a turn in the opposite
direction. When making a turn from south, it gives an indication
of a turn in the correct direction, but at a much faster rate
than is actually occurring. Compass is accurate on headings of
east and west.
--Acceleration Error: Also due to dip. Most apparent on headings
of east and west. When accelerating, the error appears as a turn
indication toward north. When decelerating, the compass indicates
a turn toward south. ANDS.
--Oscillation Error: Caused by roughness or turbulent air.
-Use UNOS (undershoot north overshoot south)
-Discuss Lesson Objectives
-Listen, Take Notes, and Ask Questions
-Review Reference Material
-The student should have the ability to explain
Mag Compass Behavior and Use during IFR Flight.
Privacy Statement |