SIGN (n)  The indication of a possible condition  EXAMINE THE SURFACE FOR SIGNS OF INTERNAL DAMAGE.  
 significant (adj)  IMPORTANT  THIS PROCEDURE IS IMPORTANT.  This procedure is significant.
 silence (v)  STOP  STOP THE ALARM BELL.  Silence the alarm bell.
 similar (adj)  ALMOST THE SAME, EQUIVALENT  THE TWO ITEMS HAVE ALMOST THE SAME SHAPE.  The two items are similar in shape.
       USE MATERIAL 11-001 OR AN EQUIVALENT MATERIAL.  Use material 11-001 or a similar material.
 SIMULATE (v) SIMULATES, SIMULATED, SIMULATED  To make a condition that is the same as one that can occur in operation  SIMULATE A WHEEL SPEED OF 80 KNOTS.  
 simultaneous (adj)  AT THE SAME TIME  TO DO THIS SERVICE BULLETIN, YOU MUST DO SERVICE BULLETIN NO. XXXX AT THE SAME TIME.  Accomplishment of this Service Bulletin requires the simultaneous accomplishment of Service Bulletin No. XXXX.
 simultaneously (adv)  AT THE SAME TIME  DO THE TWO STEPS AT THE SAME TIME.  Perform the two steps simultaneously.
SINCE (pre)  Function word that shows: "from some time in the past until a later time or now"
 NOTE : For other meanings, USE: BECAUSE (con).  IF IT IS MORE THAN TWO HOURS SINCE YOU MIXED THE COMPOUND, DO NOT USE IT.  
 single (adj)  ONE (TN)  ONE CRACK 0.50 INCH LONG IS PERMITTED.  A single crack 0.50 inch long is allowed.
 situated (adj)  INSTALL (v)  THE TRIM CONTROL KNOB IS INSTALLED ON THE CONTROL PEDESTAL.  The trim control knob is situated on the control pedestal.

 
 
 size (n)  DIMENSION  THESE CASES HAVE DIFFERENT DIMENSIONS.  These cases are of different sizes.
 skid (v)  SKID (TN)  THIS GIVES AN INDICATION THAT THE AIRCRAFT IS IN A SKID.  This indicates that the aircraft is skidding.
 slack (adj)  TENSION (TN)  MAKE SURE THE TENSION OF THE CONTROL CABLES IS CORRECT.  Check for slack control cables.
 slack (n)  TENSION (TN)  MAKE SURE THE TENSION IN THE CONTROL CABLES IS CORRECT.  Check for slack in the control cables.
 slacken (v)  TENSION (TN)  RELEASE THE TENSION IN THE CONTROL CABLES.  Slacken the control cables.
 slackness (n)  TENSION (TN)  MAKE SURE THE TENSION IN THE CABLES IS CORRECT.  Make sure there is no slackness in the cables.
 slam-decelerate (v)  MOVE  MOVE THE THROTTLE QUICKLY TO THE IDLE POSITION.  Slam-decelerate to ground idle.
slave (v)  CONTROL  THE COPILOT'S INDICATOR CONTROLS THE PILOT'S INDICATOR.  Pilot's indicator is slaved to copilot's indicator.