When in ALT HOLD FL80 you change the barometric setting from STD to QNH 1030. What will the aircraft do?
A.A.The aircraft will climb 500 feet to the new pressure level
B.B.The aircraft will descend 500 feet to the new pressure level
C.C.You cannot change the altitude when in ALT HOLD
D.D.The aircraft will continue at FL80, but the ALT readout will change
正确答案是D