Stuck Tail Rotor Pedal In-Flight 

Building a simple mental model to manage one of the least-practiced, highest-consequence emergencies. 

As I’ve mentioned before, I write for you—but I also write for me. My airmanship still needs work. 

One area many of us can improve upon is the management of stuck tail rotor pedal conditions. This is an emergency procedure that most crews rarely practice outside of the simulator. Because of that, it requires regular mental rehearsal to execute effectively when it matters. 

A Simple Mental Model 

Many years ago, I was taught to visualize two letters on the windscreen: 

D on the left and I on the right 

Think of them as: 

Decrease → nose moves left 
Increase → nose moves right 

In American-made helicopters with a counterclockwise main rotor system, this relationship generally holds: 

• Decreasing collective/torque or throttle/power → reduces the forces that yaw the helicopter right → nose yaws left 
• Increasing collective/torque or throttle/power → increases the forces that yaw the helicopter right → nose yaws right 

This is a useful baseline when pedals are no longer available to control yaw. 

Airspeed and Stability 

Airspeed does not follow the same simple rule. 

In general: 

• Increasing airspeed improves directional stability due to the vertical fin and airflow over the fuselage (weathervane effect). 
• Decreasing airspeed reduces that stability. 

However, there is an important exception: 

In a stuck left pedal condition with high tail rotor pitch, a high-power hover may be more directionally stable than low-power, low-airspeed flight. 

Understanding where stability exists for your specific condition is critical. 

Managing the Approach 

Most stuck pedal scenarios will result in a running landing. 

Heading control is managed with power: 

• Increase collective/torque or throttle/power → nose moves right 
• Reduce collective/torque or throttle/power → nose moves left 

These inputs can be balanced to maintain directional control on final. In general, large collective/torque movements should be adjusted with altitude to maneuver and significant throttle/power adjustments are made close to the ground/touchdown.

In many cases, it is advantageous to accept a slight left yaw on final and use a slight increase in collective at the bottom of the approach to bring the nose back to centerline just before touchdown. 

This requires a stabilized approach with sound timing of a small power application. Early, late, or aggressive inputs often lead to overcorrection. 

Identifying the Condition 

You can often estimate pedal position using airspeed and power: 

• Higher airspeeds and power required for trim → stuck left pedal (high pitch). 
• Lower airspeeds near bucket → stuck right pedal (low pitch). 

Severe stuck right pedal conditions effectively represent a loss of tail rotor thrust and may require an autorotation. 

Additional Considerations 

These are aircraft- and configuration-dependent, but commonly observed: 

• Rotor RPM (Nr) may decrease at the bottom of the maneuver, and electrical generators may drop offline. Starting the APU (if equipped) can help maintain electrical power. 
• If the condition is caused by tail rotor pitch centering due to hydraulic loss, reducing weight (e.g., fuel) can significantly improve landing conditions.  Because balanced flight is achieved at a much slower airspeed.
• Maximizing headwind reduces groundspeed at touchdown. 
• Crack the throttles on final early until Nr begins to decrease—this helps ensure timely and effective inputs near the ground. 
• On touchdown, freeze or slowly lower collective; abrupt reductions can induce left yaw. 
• Differential braking (if equipped) can assist with directional control. 
• If the aircraft begins to yaw during touchdown, follow the turn with cyclic to maintain stability. 

The Real Value 

This is not a maneuver you want to figure out in real time. 

A simple mental model—paired with regular visualization—can make the difference between reacting and managing.