591.Drain approximately 2 liters of fuel from the tank.

181.本规范编写时遵循的构成规则与 FAA 编写规则时用到的大体相同。

180.Pull the vehicle to a safe area where you can use the standard
procedures.

179.An operate procedure inspection, repair or maintenance practice,
which if not correctly followed,could result in injury or loss of life.

178.THE LIFE OF THE UNIT WILL DECREASE IF YOU LET THE UNIT BECOME DIRTY.

177.设置开关到打开位。

176.An appropriate warning or note shall be contained in each Handbook
to inform the operator that a current Handbook is required to be in the
airplane during flight and that it is the operator's responsibility to
maintain the Handbook in a current status .

175.The purpose of such terms being to provide definitions which are of
practical value for technical communication.

174.LET THE VENT VALVES( ) OPEN.

173.Mechanical power is produced by electric motors that are mainly used
to drive pumps,for example,fuel and hydraulic pumps or to drive a vale
to the commanded position in the fuel,hydraulic or air conditioning
system or to move mechanical parts like doors and cargo containers.

172.Vertical lists make long complex sentences much easier to read and
understand.