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FINXPAS

Rudder bias switches ?

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I must be blind  B)

 

http://www.pprune.org/biz-jets-ag-flying-ga-etc/403001-hawker-800xp-rudder-bias-checks.html

 

Where are they ?

 

Or is the light supposed to stay on ? (Not implemented)

 

Thanks :)

 

AIRCRAFT STOPPED AND PARKING BRAKE SET

DO NOT PERFORM ON THE RWY.

  • - Both engine computers and rudder bias systems must be operative.
  • - With the thrust levers at idle, check LH and RH thrust reverser ARM annunciators are illuminated. Engine Computer, Rudder Bias ………….........................Checked
  • - Select the engine computers to OFF or OVSPD PROT one at a time while observing engine limitations. Be prepared to select AUTO or to close the HP cock if engine control is lost or any abnormal response is noted.
  • - Check that ENG 1 CMPTER and ENG 2 CMPTER annunciators illuminate.
  • -Advance the RH thrust lever to indicate approximately 80% N2.(If needed, the thrust may be increased to approximately 75% N1) 
  • - Select the RUDDER BIAS switches to ON and then OFF in turn;observe that the RH rudder pedal moves forward with each ON selection.
  • - Select both RUDDER BIAS switches to ON, then LH T/R lever to deploy. 
  • - Check rudder bias is inhibited, LH UNLCK and REVRS annunciators illuminate. MWS REVERSER annunciator does not illuminate.
  • - LH T/R lever to stow. Check that the rudder bias is felt, LH UNLK and REVRS annunciators are extinguished and the LH ARM annunciator illuminates.
  • - Repeat the above procedure for the LH engine, noting that now the left rudder pedal moves forward with each rudder bias selection.
  • - Select the RUDDER BIAS switches to ON and guarded; observe that the RUDDER BIAS annunciator light extinguishes. 
  • - Select the engine computers to AUTO. Observe that the ENG 1 CMPTR and ENG 2 CMPTR annunciators extinguish.

 

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Holy Batman !

 

Thanks :)

 

 

Also found this...

 

 

Rudder Bias System (Figure 4)

Two air powered struts are connected between the fuselage and the rudder torque tube quadrant to

provide an automatic application of rudder bias to counteract asymmetric thrust caused by failure or

malfunction of one engine.

The engine bleed air system is interconnected to the struts in such a manner that each engine supplies

air to opposing sides of the strut pistons with a solenoid valve installed in each strut.

The solenoid valves are normally in the closed position when the RUDDER BIAS selector switches (A

and B ) are set to their ON positions. Accidental operation of the switches is prevented by a guard on

each switch.

Should a leak occur in one supply line to a strut, the resulting loss of air would create an imbalance of

forces which would bias the rudder to one side.

The rudder bias switches are located in the upper left area of the center control pedestal immediately

above the elevator trim mechanical indication.

Selecting the RUDDER BIAS switch on the affected side to OFF, equalizes the pressures on both sides

of the strut. The strut on the good side then maintains a balance of forces on the rudder.

An amber MWS warning, RUDDER BIAS illuminates when either RUDDER BIAS switch (A or B ) is set

to the OFF position.

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Ok so if I'm reading this right the amber lights should always be off (switches to on) unless an engine fails.  ?

 

If an engine fails you then turn off the bias switch on the side the engine has failed ?  :huh:

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Ok so if I'm reading this right the amber lights should always be off (switches to on) unless an engine fails. ?

 

If an engine fails you then turn off the bias switch on the side the engine has failed ? :huh:

The rudder bias switches should normally be on after both engines are started, and left on at all times. You definitely do NOT want to turn them off if you have an engine failure, as this is the very situation where the rudder bias system is most needed.

 

The only reason to switch rudder bias off is if the system malfunctions, or during ground maintenance engine checks where there may be a need to run one engine at high power while leaving the other engine at idle. The pilots will also momentarily switch each bias switch off while testing the system as part of their pre-takeoff checklist.

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