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STANDARD TEMPERATURE COMPUTING

What is the standard temperature at FL 60 ?

Remember :

T = 15 - (FL/10 x 2)

T in Celsius.   FL = Flight Level

Temperature decrease in standard atmosphere is - 2°C per 1 000 ft until 36 000 ft.

Above 36 000 ft, temperature is constant and egal to -56,5° C.

RESULT:

At FL 60, or 6 000 ft, temperature decrease will be 12 degrees. Standard temperature at ground level being 15 degrees, we have:

     Standard temperature at FL 60 = + 3 degrees.

 

QUICK COMPUTING OF STATIC TEMP FROM MACH NB

SAT = TAT + (3 x Mach)

 

SLOPE COMPUTING (T-O and CLIMB)

Sometimes, the slope angle is given in degrees (Departure charts), sometimes in percent (For instance, when computing the height / distance ratio of an obstacle situated in the T-O path).

Ft = % x Dist x 60

Units:

Dist : in Nm.

R/C: Rate Of Climb in Ft / Min.

G/S: Ground Speed in Kts.

° : Slope in degrees.

Elevations are in Ft and distances in Nm.

An aircraft descends on a 9 % slope. What is its slope in degrees ?

Slope 1% = 60 Ft/Nm

Slope 1 DEG @ 100 Ft/Nm

Rate (Ft/Nm) = Slope (DEG) x100


Remember :

tg g = slope in %

g= slope in degrees

tg g = Vz/Vs = H/D    (Vz et Vs in the same units, as for H and D)

RESULT

In the given exemple 9% >>> 5 DEG

Slope (%) = Vz (ft/mn) / Vs (kt)

A plane flies at FL 240. At how many Nm will the pilot have to start descent to stay on a 3° glide path ?

D(NM) = D FL / PLAN(DEG)

D FL = Difference in FL
W/C = Wind component (Kts)
TAS = True Airspeed (Kts)

 

DRIFT ANGLE QUICK COMPUTATION KNOWING MACH Nb

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