If an instrument departure procedure requires a minimum climb rate of 210 feet per NM, what is the required rate of climb for a ground speed of 140 knots?

To determine the required rate of climb when the minimum climb rate is specified as 210 feet per nautical mile and the aircraft is traveling at a ground speed of 140 knots, it’s important to first calculate the equivalent climb rate in feet per minute.

1. Convert ground speed from knots to nautical miles per minute:

• Since 1 knot equals 1 nautical mile per hour, a ground speed of 140 knots translates to 140 nautical miles per hour.

• To find the distance covered in one minute, divide by 60 (since there are 60 minutes in an hour):

( 140 , \text{NM/h} ÷ 60 = \frac{140}{60} , \text{NM/min} ≈ 2.33 , \text{NM/min}).

2. Now, apply the required climb rate:

• The departure procedure requires a climb of 210 feet for each nautical mile. Therefore, if the aircraft is climbing at that rate, for every nautical mile covered in 1 minute, it should be climbing ( 210 , \text{ft/NM} × 2.33 , \text{NM/min} ):

( 210