Cessna 172R

              When a PFD is replaced it is important the new unit is installed into the MFD position of the instrument panel first. This step is necessary to prevent loss of existing data already on the PFD configuration module. The data is used for calibration and configuring of the new unit. We need be aware important information such as the aircraft tachometer time (tach time) is in stored on the configuration module. If the data is lost, there is no means to transfer it to the new PFD. The data must be preserved for accurate log book records and scheduling upcoming maintenance events for the airplane. Refer to the Garmin G1000 NAV III 190-00325-00 Revision T or later line maintenance manual for the Garmin Display Unit (GDU) software installation. With the new GDU in the MFD position, insert the current SD card containing system software into the upper slot of the display. On the MFD, power the system ON in configuration mode. When the message “DO YOU WANT TO UPDATE SYS

Intermittent Duty Cycle Contactors The electrical circuit for the starter is the only system requiring an intermittent duty cycle contactor because of the need for a quick and strong connection for starter engagement and quick disconnect after engine start. The internal coil of an intermittent duty cycle contactor will overheat if installed in an electrical circuit requiring a continuous duty cycle contactor. Continuous Duty Cycle Contactors The battery, alternator, and external power all are systems that require continuous duty cycle contactors. The internal components of a continuous duty cycle contactor have no heat build-up even when energized for hours. The service-life of a continuous duty cycle contactor is significantly shortened if installed in an electrical circuit requiring an intermittent duty cycle contactor.

           (1) Initial Inspecton _, inspect the fuel injector fuel lines and clamps between the fuel manifold and the fuel injector nozzles. Use MSB No. 342G,  to perform the inspection. Replace any fuel injector fuel line or clamp that fails the inspection required by the Fuel Line Inspection and Installation Checklist in MSB No. 342G.          (2) Re-inspect after any maintenance is done on the engine where any clamp on a fuel injector fuel line was disconnected, moved, or loosened, and within every 110 hours TIS and after each engine overhaul. 

  Subject  - Diaphragm-Type Fuel Pump Replacement                   This SB is notification of a requirement to replace specific diaphragm-type fuel pumps identified herein as a corrective action in response to a confirmed non-conforming fuel pump in the field. Continued operation of a non-conforming fuel pump can cause fuel leakage out of the airframer’s vent line or into the engine crankcase.                   Each fuel pump has a 13-digit alphanumeric manufacturer’s code, which begins with two  letters. The alphanumeric characters in the manufacturer’s code and its location on the fuel pump will help identify the fuel pumps affected by this Service Bulletin. The first two characters in the example manufacturer’s code RC20150620703 in are RC. The next two numbers 20 identify the manufacturing week of the year as 20 and 15 is the year. The manufacturer’s code is on the fuel pump flange or on the web.