77、The bottom mark on the board is red.

146、In these conditions, the mechanical and electrical pitch trim systems will not operate.

145、In the latter case, the title shall be Pilot＇s Operating Handbook"."

144、If the tower does not respond, use a different channel.

143、If the bracket touches the plate,remove the unwanted material with file.

142、If possible, always tell your reader what can occur if the safety instruction is not obeyed.

141、Ground service bus has no power with external power available.

140、Fault isolation provides the information used to identify,locate and correct any fault that is predicted to occur on theairplane.

139、Each approved word in the dictionary has a specified approved meaning which can be more restricted than its meaning in standard English.

138、Do the deactivation procedure of the actuator to prevent damage to the valve.

137、Do the calibration of the resistance of the runway light connection.