T-45C TS & ADV CO-09; IUT CO-05

Velocity Vector

**LESSON NOTES**

*To avoid potential misunderstandings, it is important*

*that students clearly comprehend the distinction*

*between AOA in degrees and AOA in units. Both are*

*used in T-45C NATOPS general discussions and in*

1.

HUD digital AOA values are displayed in

units

2.

HUD graphic depiction of the velocity vector

is in degrees on the pitch ladder

3.

AOA degrees and units are not equal

values

4.

T-45C difference between velocity vector

digital (units) and HUD velocity vector

(degrees) is a constant factor, as per the

following formula

True AOA(UNITS) = True AOA(DEGREES) + 8.93

*Sg 2, fr 3*

1.025

**LESSON NOTES**

*When zero is entered in the above formula for True*

**AOA DEGREES AND UNITS**

*AOA (DEGREES), the HUD (UNITS) figure computes to be +8.7*

*. At 30 True AOA (DEGREES) the result is +38.0 (UNITS).*

*(UNITS)*

*So, for practical purposes it can be said that the digital*

*AOA in units is always approximately +8.0-8.7 units*

*more than true AOA in degrees.*

(10-99) Original

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