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Standard |
Updated: 02/19/08
AVT
108 – Navigation Systems
Continues the study of avionics maintenance practices
with emphasis on aircraft navigational systems. Topics include: bridges
and monitors, synchros, gyros, and navigation systems.
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Competency
Areas: |
Hours: |
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Bridges
and Monitors |
Class |
5 |
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Synchros |
D.
Lab |
2 |
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Gyros |
P.
Lab/O.B.I. |
3 |
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Navigation
Systems |
Credit |
7 |
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Prerequisite: AVT 104 |
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Corequisite: |
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Course Guide |
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Competency |
After completing
this section, the student will: |
Hours |
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Class |
D.
Lab
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P. Lab/ O.B.I. |
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BRIDGES AND MONITORS |
6 |
2
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6 |
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DC
bridges |
Explain
how voltage may be reversed in a sensing member of a DC bridge. |
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Discuss
current flow in an unbalanced DC bridge. |
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AC
bridges |
Explain
phase reversal as it applies to AC bridge circuits. |
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Discuss
the use of capacitive and inductive elements in an AC bridge circuit and the
resultant phase angles they produce in an unbalanced condition. |
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Give
an example of the aircraft system application of an AC bridge using a
variable capacitor. |
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Signal
monitors |
Discuss
the operation of a signal presence monitor circuit. |
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Give
the condition which causes a "flag" to appear in a signal monitor
circuit. |
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Modulator/demodulator |
Explain
the operation of a 400 Hz modulator. Explain
the operation of a 400 Hz demodulator. |
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Summing
points |
Define
summing point as it applies to avionics circuits. |
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Draw
the symbol which represents a summing point with three inputs and one output. |
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SYNCHROS
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10 |
2
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6 |
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Name
the components of vector problems associated with aircraft flight. |
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Explain
the resultant vectors of cross winds and speed. |
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Explain
the resultant vectors of angular winds and speed. |
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Magnetic
vectors |
Explain
the effect on a magnetic field when two "like" fields approach
straight on and at various angles. |
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Explain
the effect on a magnetic field when two "unlike" fields approach
straight on and at various angles. |
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Two
and three coil |
Describe
a two-coil electromagnetic field and explain how changes in coil voltage
level affect the resultant vector. |
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Describe
a three-coil electromagnetic field and explain how changes in coil voltage
level affect the resultant vector. |
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Rotor
and stator |
Define
the term rotor as it relates to synchros. Define
the term stator as it relates to synchros. |
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Abbreviations |
State
the meaning of the abbreviations TX and REC as they apply to synchro
schematics. |
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Null |
Explain
phase reversal when a synchro rotor passes through null. |
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Determine
direction of the field vector when presented with diagrams of various synchro
rotor positions. |
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Application |
Give
examples of synchros use in aircraft avionics systems. |
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Differential |
Explain
the purpose of a differential synchro. |
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Resolver |
Compare
the output of a resolver synchro with that of a receiver synchro for any
given degree of rotor movement. |
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Interpretation
of diagrams |
Recognize
circle and coil schematic symbols for transmit, receive, differential, and
resolver synchros. |
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Servo
motors |
Explain
the operational similarities and differences between synchros and servo
motors. |
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Servo
application |
Give
examples of servos use in avionics systems. |
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Operational
check |
Operationally
check avionics systems which use servos to control position. |
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GYROS
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6 |
2
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6 |
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Precession |
Explain
the angle of precession of a spinning gyro when the axis is tilted. |
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Free |
Compare
the position of a spinning perfect free gyro as it is moved to different
locations of the earth. |
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Application: horizon direction rate turn and
slip |
Give
examples of avionics systems which make use of a gyro to provide attitude
information. |
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Operation
check |
Operationally
check indicators which use gyros to develop position information. |
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NAVIGATION
SYSTEMS (Apply all tasks to
each lesson.) |
28 |
14
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12 |
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Compass Inertial navigation system (INS) Automatic direction finder (ADF) Instrument landing system (ILS) Transponders Distance measuring equipment (DME) Marker beacon Radio altimeter Air data systems (ADS) Weather radar Global Positioning Systems (GPS) Loran navigation Area navigation Ground proximity warning system (GPWS) VHF omni-range (VOR) Remote Area Navigation Systems (RNAV) |
Perform
an operational check of each component of aircraft navigation systems. Remove
units and components of aircraft navigation systems. Given
entry from flightlog or work order, analyze a reported malfunction of
aircraft navigation systems. Use
appropriate electronic measuring instruments to troubleshoot aircraft
navigation systems to the unit, or component level where applicable, and
isolate the defective item(s). Replace
units and components of aircraft navigation systems. Document
maintenance actions performed on aircraft navigation systems in accordance
with local directives and Federal regulations. Navigation
principles, great circle routes, include enhanced GPWS and wind shear. |
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Suggested
Resources |
Bose, K. W. (1990). Aviation
electronics (4th ed.). Casper, WY: IAP.
Eismin, T.
K., et al. (1989). Aircraft electricity
and electronics (4th ed.). New York:
McGraw-Hill.
IAP, Inc. (1985). Basic electronics and radio installation. Casper, WY:
Author.
IAP,
Inc. (1987). Avionic
fundamentals. Casper, WY: Author.
IAP, Inc. (1990). Aircraft inspection and maintenance records. Casper, WY:
Author.
IAP, Inc. (1990). The
best of AMJ maintenance tips. Casper, WY: Author.
Powell, J. (1990). Aircraft
radio systems. Casper, WY: IAP.
Aircraft
Maintenance Record (actual or simulated)
Aircraft
Type Certificate Data Sheets
Manufacturers'
Service Manuals