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|  Stability
T-45A/C TS, E2C2, ADV & IUT Aero-04
4.
Flap/Slat Extension
Sg 2, fr 15
Longitudinal Stability --
Gear, Flap/Slat
a.
Moves AC forward 3.49 inches (extending
Extension
landing gear moves CG aft)
b.
Aircraft less stable but more maneuverable
O.
Speed Brakes
1.
Extending the speedbrakes is destabilizing
2.
Turbulent flow on lower surface of horizontal
Sg 2, fr 16
stabilizer reduces pressure causing aircraft to pitch
Longitudinal Stability --
up
Speed Brake Effect
3.
Speed Brake to stabilator Interconnect (SBI) is one
of Control Augmentation System functions that
reduces pitch transients during speed brake
extension and retraction
a.
Reduces positive pitch transients (speed brake
extension) from 0.2 to 0.7 Mach
b.
Reduces negative pitch transients (speed brake
extension) above 0.7 Mach during speed brake
c.
Control stick does not move
Sg 2, fr 17
P.
Stabilator Vanes
Stabilator Vane
1.
Located on both sides of fuselage above the speed
brakes, forward of the stabilator
2.
Generates vortex to energize flow over lower
surface of stabilator to keep it effective
Q.
Landing Gear Doors
1.
Directional stability is reduced during landing gear
Sg 2, fr 18
extension
Fig 6: Landing Gear
Doors Effect on
a.
inner main landing gear (MLG) doors open
Directional Stability
b.
forward nose landing gear (NLG) doors open
(9-99) Original
Page 4-11
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