There are two ways to calculate your true airspeed. You can use your E6B to convert your indicated airspeed (if you assume indicated airspeed is equal to calibrated airspeed) to a true airspeed or you can use your engine performance chart in your flight manual to find an engine power setting at a specific RPM, altitude and temperature and then use this power setting to find true airspeed on your cruise performance chart.

To me, it makes sense to use the E6B method for the climb phase of flight since you will already be targeting an indicated airspeed to fly anyways (best rate of climb). Then, for cruise and descent, we can target an RPM to fly and use this in our performance charts to find true airspeed.

This video gives an example of how to use the performance charts to find true airspeed in cruise and descent.

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🛫 Timestamps:
00:00 Intro
00:24 How to find True Airspeed during Cruise and Descent
00:50 The reason why I choose the E6B method for Climb
01:14 Target RPM for Cruise and Descent
02:25 Step 1: Engine Power Setting in a percentage
02:50 Step 2: Find True Airspeed on the Cruise Performance chart
03:03 Let’s assume these conditions during the Cruise and Descent portion of our Flight plan
03:43 Checkpoints 4 to 7, Step 1
04:57 Checkpoint 8, Step 1
05:30 Checkpoint 9, Step 1
05:47 Checkpoints 4 to 7, Step 2
07:21 Checkpoint 8, Step 2
07:47 Checkpoint 9, Step 2

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