8. INSTRUCTIONS TO LINE JUDGES
8.1.The Line Judges shall sit on chairs directly looking down their designated lines at the ends and sides of the court and preferably at the side opposite to the Umpire unless otherwise instructed by the Referee (see diagrams).
8.2.A Line Judge shall be entirely responsible for the line(s) assigned except that the Umpire shall overrule the call of the Line Judge if, in the opinion of the Umpire, it is beyond reasonable doubt, that a Line Judge has clearly made a wrong call (Law 17.5.1). Any overrule by the Umpire or the result of a challenge made by a player where an Instant Review System (Law 17.5.2) is in operation, shall supersede the original line call by the Line Judge.
8.3.If the shuttle lands out, no matter how far, call "out" promptly in a clear voice, loud enough to be heard by the players and the spectators and, at the same time, signal by extending both arms horizontally so that the Umpire can see clearly. Look towards the Umpire.
8.4.If the shuttle lands in, the Line Judge shall say nothing, but point to the line with the right hand while looking towards the Umpire.
8.5.If unsighted, inform the Umpire immediately by putting both hands up to cover the eyes.
8.6.Do not call or signal until the shuttle has touched the floor.
8.7.Calls or signals shall always be made without any anticipation of the Umpire's decision regarding faults (e.g. the shuttle touching the player, his clothing, or racket before landing on the court, however obvious).
8.8.The approved hand signals are
8.9.Where practical, it is recommended that the Line Judges' positions be 2.5 to 3.5 metres from the court boundaries and, in any arrangement, the Line Judges' positions be protected from any outside influence (e.g. by photographers).
8.10.LJ indicates the positions of the Line Judges: