An aircraft at FL120, IAS 200 kt, OAT -5°C and wind component +30 kt, is required to reduce speed in order to cross a reporting point 5 MIN later than planned.
Assuming flight conditions do not change, when 100 NM from the reporting point IAS should be reduced to...
To be possible add a wind vector given in knots, first a conversion from IAS to TAS must be carried in order to obtain the G/S.
CAS/IAS to TAS with your flight computer
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Set pressure altitude in the window opposite the OAT in Celsius.
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Without moving the computer’s scales, read TAS on the outer scale opposite to CAS.
Set PA 12 000 against -5ºC, opposite to IAS 200 kts read TAS 242 kts.
With the actual TAS of 242 kts and with 30 kts tailwind, the aircraft would cross the reporting point after:
FT = 100 / (242 + 30) = 0º22’
The aircraft is requested to cross the reporting point 5’ later than planned, which makes a FT of 0º27’.
New G/S = 100 / 0º27’ = 222 kts
New TAS = G/S - Tailwind component = 222 -30 = 192 kts
With the conversion side of the flight computer, set PA 12 000 against -5ºC, opposite to TAS 192 kts read IAS 159 kts.
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