NIGHT OPERATION Stop Come ahead Emergency stop Cut engines  All clear (O.K.) Left turn Start engine  Pull chocks Insert Chocks Slow down Right turn Same hand  movements as  day operational Figure 5-65. Taxiing on the yellow airport taxi line. Figure 5-64. Hand signals for ground operations. •  Turn on electric instruments if applicable. •  Check gauges for proper ranges (oil pressure,  revolutions per minute (rpm), charging voltage, engine  temperatures within ranges, etc.) •  Continue to monitor area and shut down engine if any  person or animal approaches. start with a cold engine, as there is insuffi cient lubrication  until the oil pressure rises on four-stroke engines, and unequal  heating on two-stroke engines. In freezing temperatures,  the engine is also exposed to potential mechanical distress  until it warms and normal internal operating clearances are  reached. On four-stroke engines, as soon as the engine is started,  the oil pressure should be checked. If it does not rise to  the manufacturer’s specified value, the engine may not  be receiving proper lubrication and should be shut down  immediately to prevent serious damage. Since an aircraft is moved under its own power between  the startup area and the runway, the pilot must thoroughly  understand and be proficient in taxi procedures. When the  brakes are first released and the aircraft starts to roll, the  brakes should be tested immediately for proper operation.  Applying power to start the WSC aircraft moving forward  slowly, then retarding the throttle and simultaneously  applying pressure smoothly on the brake may be needed to  accomplish this. If braking action is unsatisfactory, the engine  should be shut down immediately. When yellow taxiway centerline stripes are provided, they  should be followed unless it becomes necessary to deviate  to clear aircraft or obstructions.  [Figure 5-65] A relatively low rpm setting is recommended immediately  following engine start. This is typically a slight increase in  the throttle to keep the engine running smoothly. It is not  recommended to allow the rpm to race immediately after a  An awareness of other aircraft that are taking off, landing, or  taxiing, and consideration for the right-of-way of others is  essential to safety. When taxiing, the pilot’s eyes should be  looking outside the aircraft, to the sides, as well as the front.  The pilot must be aware of the entire area around the aircraft  to ensure that it clears all obstructions, people, animals, and  other aircraft. If at any time there is doubt about the clearance  from an object, the pilot should stop the aircraft and check  5-24  Taxiing