Communication

TTP	B1-L2	ATA23
Cessna 172	B2-L3

Speech communication -  radio equipment used for reception and transmission of voice communication.

Audio integrating system  system which controls the output of the communications and navigation receivers into the pilot and passengers headphones and speakers, and the output of the pilot’s microphone into the communications transmitters.

Static discharging  wicks used to dissipate static electricity.

Cessna 172 with the Garmin G1000, the center of the Garmin G1000 is the GIA 63 Integrated Avionics Unit (IAU), which is in the tailcone. The GIA 63 operates as a primary communications center that connects all of the Line Replaceable Units (LRUs) with the Primary Function Display (PFD) and Multi-Function Display (MFD). The GIA 63 has the GPS receiver, VHF NAV/COM receivers, and system integration microprocessors. The GIA 63W has the Wide Area Augmentation System (WAAS) installed. The GIA 63 transmits directly to the PFD and MFD by a High-Speed Data

Bus (HSDB) Ethernet connection. Software and configurations are sent from the displays through the GIA 63 to the LRU's in the system.
Static wicks are mounted on the trailing edges of the ailerons, rudder and the elevators.Maintenance of the static (discharger) wicks consists of removal/replacement of the wick assembly and ensuring that bonding straps are properly connected between control surfaces and primary structure.
 Bonding straps are secured to flight control surfaces and electrically connect those surfaces to the primary structure.Bonding straps are provided to ensure that electrical potential between primary and secondary structure remains nearly equal. If bonding straps are removed, they should be reinstalled using hardware called out in the 172R Illustrated Parts Catalog.

Maximum allowable resistance (in ohms) for bonding straps is 0.0025 ohms.

Primary and secondary structure should be cleaned using scotch brite pad and P-D-680 solvent before installing bonding hardware. Aluminum surfaces should be chemically protected (alodine or equivalent) before attaching bonding hardware to surface.

       

PTP Cessna 172	B1L2	LOC		SGH		MEL
	B2L3	LOC	FOT	SGH	R/I	MEL	TS
Task Code 235002	Microphone Push-To-Talk Switch - Clean the pilot's and copilot's  microphone switches.

231001 Communication Antennas and Cables - Inspect for security of attachment,                              connection and condition. C 05-12-03 Z210

235001 Microphones, Headsets, and Jacks - Inspect for cleanliness, security, and evidence

             of damage. C 05-12-01 Z211

235002 Microphone Push-To-Talk Switch - Clean the pilot's and copilot's microphone                        switches. B 05-12-01 222