Figure 3-5. PPC CG adjustment example. Figure 3-6. Some instrument panels will have just a few  digital or analog gauges for EGT and RPM. or OFF, which is a closed switch to GROUND and  removes the power source from the spark plugs. Typi - cally, PPC engines have two spark plugs per cylinder,  two switches and two completely separate ignition  systems. Some single place PPCs with smaller en - gines have only a single spark plug per cylinder, one  ignition switch, and a single ignition system. The FAA defines the required minimum instrumen - tation for PPCs; engine manufacturers may recom mend certain instruments be installed on the aircraft  to monitor the performance of their particular engine.  For example, on a  liquid-cooled engine, the manufac- turer may recommend instrumentation to monitor en- gine gas temperatures (EGT), water temperatures and  RPM. On an air-cooled engine, the manufacturer’s  recommendation may be EGT, cylinder head temper - ature (CHT) and RPM. Additional instruments can be  added as desired by the individual aircraft owner. Some PPCs may only have a few  analog gauges.  [Figure 3-6] Some makes and models may be  equipped with an engine information system (EIS). [Figure 3-7] The EIS is a flight computer and screen  that receives input signals from sending units connect - ed to engine and flight probes or sensors. The com puters are pre-programmed for different makes and  models of engines. Engine information may include:  RPM, EGT, CHT, water temperature, fuel quantity, an  hour meter and a voltmeter. Flight instruments may  include altimeter, vertical speed indicator and a GPS. This engine and flight information is viewed on the  LCD screen and has function keys, allowing the  pilot to move between display screens that contain the  computer’s input. When the display button is pressed,  The  ignition switches are usually located on the in- strument panel and have two positions: ON, which  allows power to make contact with the spark plugs,  The  instrument panel is in front of the pilot and pro- vides engine and flight information. The pilot is re - sponsible for maintaining  collision avoidance with  a proper and continuous scan surrounding the pow- ered parachute, as well as monitoring the information  available from the instrument panel. The pilot must  process the outside cues along with the instrumenta- tion throughout the flight for a sound decision-making  process.  The term “CG tubes” sometimes refers to the three  tubes that meet at the point of rigging for the wing  (upper CG tube, lower CG tube and center CG tube).  [Figure 3-5] Sometimes the term “CG tube” refers  only to the tube that is adjustable, and the other tubes  that meet at the rigging points are called outrigger  arms. The  attachment point bracket on the cart is one meth- od to select the fore and aft wing attachment position  for proper CG adjustments. [Figure 3-4] Always refer  to the POH for weight and balance information spe - cific to the powered parachute you are flying. rations and designs that vary by manufacturer, make,  and model. Multiple Attachment Points Bracket Center of Gravity Adjuster Tubes Instrument Panel 3-3