Login
Register
| Contents [show] |
Normal Law
Operates in 3 modes:
- ground mode, when on the ground and controls are conventional (direct law)
- flight mode, in the air after a gradual transition from ground mode
- flare mode, the introduction of a conventional feel to the landing phase passing 100' (direct law)
Side stick deflection gives a rate demand to the flight control computers. The demand is rate of roll in roll, and load factor (g) in pitch. Rudder pedal inputs are not required for turn coordination or dutch roll damping.
Control
| Normal Law | ||
| Pitch | ground | direct |
| flight | load factor | |
| flare | direct | |
| Roll | ground | proportional |
| flight | roll rate | |
| flare | roll rate | |
Protections
| Name | Axis | Description |
| Load factor limitation | vertical | limits maximum g loads: +2.5g to -1g (clean), +2g to 0g |
| Pitch attitude | vertical | limits pitch: 25° to 30° NU, 15° ND |
| High angle of attack | vertical | has priority over other protections, limits based on airspeed: VLS (with autothrust), VαPROT (no autothrust), VαMAX (overridden with side stick) between αPROT and αMAX, AOA is proportional to side stick and returns to αPROT if released |
| High speed | vertical | limits airspeed: slightly >VMO/MMO |
| Bank angle | lateral | limits bank angle: 67°, 33° when side stick released, 45° limit with high speed or angle of attack protection |
 | 
|
| Figure: VLS, VαPROT, VαMAX | Figure: High angle of attack protection airspeed tape indications |
Turbulence damping function
Damps structural modes induced by turbulence. It may be manually inhibited using the TURB DAMP pb sw.
Failures
A single failure cannot result in loss of normal law, however multiple failures of flight control, hydraulics, or electrical systems may result in a degradation of the flight control law.
Reconfiguration Control Laws: Normal Law → Alternate Law (1 and 2) → Direct Law → Mechanical Backup
| F/CTL ALTN LAW (PROT LOST) | - degradation to alternate law |
| F/CTL DIRECT LAW (PROT LOST) | - degradation to direct law |