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Because the rudder system has a high and low boost state activated by flap position.

The Elevator is always system pressure (3000).   Same reason aileron system does not have gauges, it is always one pressure range and does not change (short J models are the only exeption to this)

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38 minutes ago, hehe said:

Because the rudder system has a high and low boost state activated by flap position.

The Elevator is always system pressure (3000).   Same reason aileron system does not have gauges, it is always one pressure range and does not change (short J models are the only exeption to this)

As You know at high altitude of aircraft less pressure is require to move rudder ( reduce pressure 1275 to 1300 psi both system) Pilot must be  monitored the both pressure through booster rudder and UTY indicators. for this purpose   HYD rudder  booster and Utility diverter panels are installed at above aft cargo door. System can be overridden (3000 Psi) by push button SW is mounted  at same place and toggle guarded SW is mounted at flight pedestal at any time.

Best Regards

Munir Abbasi

Home of Hercules Pakistan

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On 11/9/2020 at 1:27 AM, hehe said:

Because the rudder system has a high and low boost state activated by flap position.

The Elevator is always system pressure (3000).   Same reason aileron system does not have gauges, it is always one pressure range and does not change (short J models are the only exeption to this)

Short J models are an elevator hydraulic press indicator? 

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