Longitudinal
Static Stability |
- \(M_w\)
- \(M_u\)
- \(M_{\theta_C}\)
- \(M_{\theta_{TR}}\)
|
- Trimmed flight control positions
- Trimmed flight control positions - collective
- Apparent static stability
- Collective fixed static stability
|
- Control margins
- Control inputs progressive, predictable, and in correct sense
- Speed selection
- Speed maintenance
|
Manoeuvre
Stability |
- \(M_w\)
- \(M_q\)
- \(M_{\theta_C}\)
|
- Apparent manoeuvre stability
- Collective fixed manoeuvre stability
- Pull-ups/push-overs
|
- Aggressive turning and manoeuvring flight
|
Longitudinal
Dynamic Stability |
|
- Excitation of dynamic long term mode
- Natural turbulence, release to trim, pulse input
|
- IMC flight
- Transit
- Nuisance mode
|
Lateral-Directional
Static Stability |
|
- Trimmed flight control positions
- Steady heading sideslip (SHSS)
|
- Control margins
- Control inputs progressive, predictable, and in correct sense
- Sideforce cues
- Maintaining balanced flight
|
Lateral
Static Stability
(Dihedral) |
|
- SHSS
- Turns on one control – pedal
|
- Transit
- Lateral and out-of-wind transitions
- Instrument approaches
|
Directional
Static Stability |
|
- SHSS
- Turns on one control - cyclic
|
- Transit
- Instrument approaches
|
Lateral-Directional
Dynamic Stability
Oscillations
(Dutch Roll Mode) |
|
- Excitation of LDO via doublet, pulse,
or SHSS release to trim
|
- IMC flight
- Transit
- Nuisance mode
|
Lateral-Directional
Dynamic Stability
Spiral Stability |
- \(L_v\)
- \(N_r\)
- \(N_v\)
- \(L_r\)
|
- Turns on one control – cyclic
- Time to half/double bank angle
|
- IMC flight
- Turns
- Lateral gust response
|