A few notes to pass along as we head into spring.
New Fuel Indicating System installed in N212CF
We have replaced the fuel indicating system in 212CF with new magnetic fuel float senders and a digital fuel level indicator. This should provide the aircraft with a more reliable and longer-lasting solution as the sender electronic components are not exposed to fuel. The digital gauge both displays the percentage and absolute fuel volumes.
There is one change to the behavior of the LOW FUEL annunciator due to this new installation. We have modified page 7-25 of the AFM to document the new behavior. Please read through this section.
Each fuel tank also incorporates warning circuits which can detect low fuel conditions and erroneous transmitter messages. Anytime fuel in either tank drops below approximately five gallons, the amber L LOW FUEL R messages will flash on the annunciator panel for approximately 10 seconds and then remain steady amber. The pilot will need to examine the fuel level indicator to determine which tank has five or fewer gallons. The annunciator cannot be turned off by the pilot; only by refueling the tank above five gallons will the annunciator be extinguished.
In addition to low fuel annunciation, the warning circuity is designed to report failures with the fuel transmitters caused by shorts or opened circuits. If the circuitry detects any of these conditions, the fuel level indicator will indicate a red ‘x’ underneath the tank for which the circuitry has detected a condition. In addition, the amber L LOW FUEL R messages will flash on the annunciator panel for approximately 10 seconds and then remain steady amber. In this condition, the fuel indicating system is inoperative and the aircraft is not airworthy.
CE-172 Operational Notes
- The KLN 94 GPS database will be kept up to date with every AIRAC cycle, making it legal to use under IFR.
- When turning during taxiing, completely depress the rudder peddle before applying the brake to reduce side loads on the nosewheel tire.
- With warmer temperatures on the way, please closely watch the cylinder head temperatures on departure and climb. CHTs should be maintained below 380F to prolong the life of the cylinders. If you observe temperatures above 400F, immediately reduce power (altitude permitting), reduce pitch (altitude permitting) and enrichen the mixture. These actions will reduce the amount of power and heat being generated, and/or improve cylinder cooling.
- When established in cruise flight, ensure that you are using the engine monitor Lean Find feature to determine the peak EGT, and then enriching the mixture to at least 100 degrees rich of peak temperature.
- Please ensure that you are logging oil and fuel added on the clipboard.
- As part of your postflight process, please clean the leading edges using the degreaser in the footlocker, and ensure that the aircraft is tied down, chocked, and install the cover if your flight is the last flight of the day.
If you are unsure of how to interpret CHT and EGTs, please see this article by Mike Busch: Understanding CHT and EGT.
If you are unsure of how to use the JPI EDM 700 to interpret CHTs and EGTs, and lean the mixture using the lean find setting, please watch this video or read through the JPI EDM 700 Pilot Guide.