维修人员在对液压系统进行维修作业时，必须佩带（）

17.Examine the seal for defects.

16.The control unit is installed aft of the cockpit.

15.Install the manifold

14.Documents must be readily revisable.

13.Deactivation/Reactivationprocedures for circuits,systems,units,etc,shall be included

12.The user of the schematicdiagram is the pilot

11.Corrosion can have many causes.

10.If the radio signal is not clear,adjust the frequency.

9.Movethe lever rear ward.

8.In this configuration,the hydraulicpressure bypasses the valve