509.The FD bars are displayed:

　On ground,when the system is electrically supplied and just after the safety tests.

　When the FD function are engaged, as long as HDG V/S is displayed on the FCU and an AP/FD mode is active.

　As long as 1FD2 is displayed on the top right of each PF

正确答案：B

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152.Which component controls antenna stabilization?

151.How is the excessive deviation displayed on vertical scale ?

150.What is display in ROSE NAV mode when the ILS pushbutton is selecetd on the EFIS control panel ?

149.The IR portion of the ADIRU provides the FMGC with :

148.The primary source of ADIRU 3 is:

147.The control segment is composed of :

146.The satellite orbital planes have an inclination of:

145.How is the excessive deviation displayed on vertical scale ?

144.What is displayed in ROSE NAV mode when the ILS pushbutton is selected on the EFIS control panel ?

143.When does the ILS red flag appear ?