Directional Stability
Poor In All Flight Regimes
• Power On and Off

NATOPS Has Multiple Warnings Due To Low
Directional Stability
• Stability and Control
• Structural Limitations



Stability and Control
Excess slideslip generated per degree of rudder travel
• 20 beta with 8 rudder
• >30 beta with 12 rudder
• Departs at >12 rudder

Adverse yaw is aggravated by low stability
• Rudder fixed roll to 30 bank results in 20 sideslip

Engine
• 20 sideslip results
• Careful (unnatural) use of rudder required
• Tendency to over control is noted

Structural Loads
• Multiple warnings to avoid use of excess rudder
• Large abrupt control reversals prohibited