NAVIGATION

TTP	B1-L2	ATA34
Cessna 172	B2-L3

NAVIGATION -  navigation systems, units, and components which provide airplane
navigational information. Included are pitot/static temperature, gyros, compass, VOR and indicators.
Flight Environmental Data Section describes systems that sense environment conditions, and use data to influence navigation of the airplane. This includes systems that depend on pitot and static information.
Attitude and Direction Section describes systems that use magnetic gyroscopic and inertia forces. This includes items like gyros, compass, magnetic heading, and turn and bank.
Dependent Position Determining Section describes systems that provide information to determine position, and are mainly dependent on ground installation. This includes systems like VOR, ADF, GPS, and transponders

OUTSIDE AIR TEMPERATURE INDICATOR-
Outside air temperature is measured using a remote-mounted probe connected to a
cockpit-mounted indicator.The OAT (outside air temperature) probe is mounted on the upper cabin roof line at FS 46.46. This probe transmits an electrical millivolt signal to the cockpit mounted gauge through a pair of wires which route above the cabin headliner, through the left side windshield pillar, and terminating behind the instrument panel.
Cockpit-mounted indicator is located in the upper left portion of the instrument panel.
The indicator also incorporates a digital clock and voltage-reading functions. Inputs into the
indicator include 28.0 VDC for power, internal lighting and keep-alive clock functions, and
millivolt inputs from the temperature probe.
NOTE: The indicator has provisions for a single 1.5 VDC “AA” battery used to power the
clock independent of airplane power. This battery, if installed, should be replaced every two years.
ATTITUDE AND DIRECTION 

Three gyroscopic instruments show attitude and direction. The instruments are in the pilot's instrument panel. Included are the horizon gyro (attitude indicator), directional gyro, and turn coordinator (roll rate gyro).
Garmin G1000, two gyroscopic instruments give attitude and direction. The
horizon gyro is in the center instrument panel. The horizon gyro gives attitude and direction and is the middle standby instrument. The turn coordinator gives roll rate data to the autopilot and is installed on the left side of the center instrument panel. The turn coordinator cannot be seen in the cockpit.
Vacuum system supplies air flow necessary to move the gyro rotor in the horizon gyro. Incorrect operation of the vacuum system will cause the horizon gyro to operate incorrectly.
It is necessary for the horizon gyro to have 4.5 to 5.5 inches Hg of vacuum to operate correctly. The gyro will reach rated performance with correct vacuum applied in a minimum of 3 minutes of rotor spin time.
Gyro rotor can continue to spin for approximately 15 minutes after vacuum in the system is
removed. It can show a change in the roll and/or pitch indication while the rotor speed decreases.
Gyro rotor will remain in a roll and/or pitch indication when stopped until the system starts again.If a gyro has been shut down and started again before the rotor has been permitted to stop, more time will be necessary to get the correct pitch and roll indication.
COMPASS- A lighted, magnetic compass is installed on top of the glareshield at the airplane center line.
MAGNETOMETER - Airplanes with Garmin G1000, the GMU 44 magnetometer senses magnetic field information. The data is used by the GRS 77 AHRS to find aircraft magnetic heading.
ATTITUDE HEADING REFERENCE SYSTEM (AHRS)- airplanes with Garmin G1000, the GRS 77 AHRS is an attitude, heading, and reference unit that gives airplane attitude and flight characteristics information to the Primary Flight Display (PFD) and Multi-Functin Display (MFD) and the GIA 63 Integrated Avionics Units. The unit has advanced
tilt sensors, accelerometers, and rate sensors. In addition, the GRS 77 AHRS interfaces with both the GDC 74A Air Data computer and the GMU 44 Magnetometer. The GRS 77 AHRS also utilizes GPS signals sent from the GIA 63.
GIA 63 INTEGRATED AVIONICS - Two GIA 63 Integrated Avionics Units (IAU's) are on the avionics shelf in the tailcone. The units have the communication and navigation receiver/transmitter components to operate the GPS, NAV, COM, and Glideslope functions. The GIA 63W has the Wide Area Augmentation System (WAAS) installed. The units are integrated components of the Garmin G1000 avionics system.
GPS- KLN89B or the optional KLN94GPS is installed in the avionics panel radio rack. The GPS antenna is mounted above the cabin, in the general proximity of the comm antennas.
KR-87 ADF SYSTEM- airplanes without Garmin G1000, the KR-87 ADF receiver is installed in the avionics panel radio rack. The ADF antenna is installed on the bottom fuselage below the cabin. Use the KR-87 ADF receiver to tune the KR-87 system. Indications are shown on the KI-227 ADF indicator, located to the left of the receiver.
Airplanes with Garmin G1000, the KR-87 ADF receiver is installed on the instrument panel
to the right of the Multi-Function Display (MFD). The ADF antenna is installed along the bottom fuselage centerline under the cabin. To tune the KR-87 ADF system, use the KR-87 ADF receiver. All indications are shown on the G1000 Primary-Flight Display (PFD).
KT76C TRANSPONDER- is in the avionics panel radio rack. The transponder antenna is on the bottom of the cabin forward of the baggage area.
KT-73 MODE S TRANSPONDER- is installed in the avionics-panel radio mounting rack. The CI-105 transponder antenna is installed on the bottom of the fuselage.
GTX 33 TRANSPONDER- Airplanes with Garmin G1000, the GTX 33 Transponder is a solid-state Mode-S transponder that gives Mode A, C, and S functions. Control and operation is through the Primary Flight Display (PFD). The transponder speaks with the GIA 63 Integrated Avionics Units.
GDL-69A FIS- Flight Information System (FIS) is a remote-mounted component of the Garmin G1000 avionics system. The GDL-69A gives weather and FIS information to the pilot. The information is controlled and seen through the Multi-Function Display (MFD). Information is sent from the data link receiver to the MFD through the high-speed data bus ethernet data path. With a current subscription, XM satellite radio service is available with the GDL-69A. The signals that the data link receives from satellites give better coverage than land-based transmissions. The XM radio is tuned through the MFD. Analog audio is sent to the audio panel and shares the AUX music input with the external audio entertainment input.
DME -  airplanes with Garmin G1000, the KN-63 Distance Measuring Equipment (DME) gives range, speed, and time-to-station information displayed through the G1000 display system. The KN-63 DME has a remote-mounted receiver in the rear fuselage aft of FS 142.00. The DME antenna is on the bottom fuselage below the cabin at FS 114.50.
KMD-540 MULTI-FUNCTION DISPLAY- is a multi-function display (MFD) that can be installed to give the pilot more situational awareness during flight. Enhanced ground proximity warning system (EGPWS) and traffic advisory
system (TAS) data is given on the color MFD display. Other data, such as global positioning system (GPS) data and weather data can be shown on the display. These displays can give the pilot more data that is easy to read in a short period of time.
GARMIN DISPLAY UNIT (GDU) - has a 10.4 inch LCD display with 1024x768 resolution. The cockpit has two GDU 1040s. One is configured as a Primary Flight Display (PFD) and the other is configured as the Multi-Function Display (MFD). The MFD shows navigation, engine, and airframe information. The PFD shows primary flight information, in place of gyro systems. Both GDU 1040s connect and show all functions of the G1000 system during flight. The displays communicate with each other and the GIA 63 Integrated Avionics Units (IAU) through a High-Speed Data Bus (HSDB) Ethernet connection. The PFD and MFD have a reversionary switch in which one display can show all information usually shown by both displays in the event that one does not operate correctly.

PTP Cessna 172	B1	LOC		SGH		MEL
	B2	LOC	FOT	SGH	R/I	MEL	TS

341101 Static System - Inspect for security of installation, cleanliness, and evidence of                       damage. 
342101 Magnetic Compass - Inspect for security of installation, cleanliness, and evidence of damage.
345001 Instrument Panel Mounted Avionics Units (Including Audio Panel, VHF Nav/Com(s),
             ADF, GPS, Transponder, and Compass System) - Inspect for deterioration, cracks, and security of instrument panel mounts. Inspect for security of electrical                 connections, condition, and security of wire routing.
345002 Avionics Operating Controls - Inspect for security and proper operation of controls
and switches and ensure that all digital segments will illuminate properly
345003 Navigation Indicators, Controls, and Components - Inspect for condition andsecurity
345004 Navigation Antennas and Cables - Inspect for security of attachment, connection,                 and condition.