A pilot reported his bae 125 series 800 rudder pedals became very difficult to displace during climb...

Narrative:

All preflight control checks were normal. First flight checks including rudder bias system checked normal. After takeoff still hand flying aircraft and was given a climbing left turn. As I initiated it at about 800 ft and applied left rudder to keep coordinated flight; I felt enormous pressure. Sic had engaged yd. I rolled out of turn on assigned heading and disengaged yd. Pressure/resistance was still felt on rudder pedals. Speed was approximately 200 KTS. It took a huge amount of force to displace rudder pedals. Felt like the rudder bias system had 'engaged' itself simultaneously on both sides. No abnormal indications on mws either. We requested return to the departure airport and landed. Adjusting speed for landing had no effect on pedal pressure. After landing and thrust at idle pedals checked normal free and clear. Advancing thrust to higher power setting again got the resistance again.

Original NASA ASRS Text

Title: A pilot reported his BAe 125 Series 800 rudder pedals became very difficult to displace during climbout as if the Rudder Bias system had self-engaged; so the crew returned to the departure airport where the rudder pedals released with the thrust levers at idle.

Narrative: All preflight control checks were normal. First flight checks including Rudder Bias system checked normal. After takeoff still hand flying aircraft and was given a climbing left turn. As I initiated it at about 800 FT and applied left rudder to keep coordinated flight; I felt enormous pressure. SIC had engaged YD. I rolled out of turn on assigned heading and disengaged YD. Pressure/resistance was still felt on rudder pedals. Speed was approximately 200 KTS. It took a huge amount of force to displace rudder pedals. Felt like the Rudder Bias system had 'engaged' itself simultaneously on BOTH sides. No abnormal indications on MWS either. We requested return to the departure airport and landed. Adjusting speed for landing had no effect on pedal pressure. After landing and thrust at idle pedals checked normal free and clear. Advancing thrust to higher power setting again got the resistance again.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1265740
Time
Date	201505
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Rudder Control System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

A pilot reported his bae 125 series 800 rudder pedals became very difficult to displace during climbout as if the rudder bias system had self-engaged; so the crew returned to the departure airport where the rudder pedals released with the thrust levers at idle.