7. INSTRUCTIONS TO SERVICE JUDGES
7.1.The Service Judge shall sit on a low chair by the net post, opposite the Umpire.
7.2.The Service Judge is responsible for judging that the server delivers a correct service (Law 9.1.2 to Law 9.1.10). If not, call "Fault" loudly followed by a specific explanation of the service fault (Vocabulary Section 4) and use the approved hand signal to indicate the type of infringement.
7.3.The Umpire shall use the standard vocabulary to explain the specific service fault.
7.4.The approved hand signals for breaches of the Service Laws are
On completion of the backward movement of the server's racket head, any delay in the start of the service (Law 9.2) shall be considered to be an undue delay.
Laws 9.1.3 and 9.1.4
The server and the receiver shall stand within diagonally opposite service courts without touching the boundary lines of these service courts. Some part of both feet of the server and the receiver shall remain in contact with the surface of the court in a stationary position from the start of the service (Law 9.2) until the service is delivered (Law 9.3).
The server's racket shall initially hit the base of the shuttle.
The whole shuttle shall be below the server's waist at the instant of being hit by the server's racket. The waist shall be considered to be an imaginary line round the body, level with the lowest part of the server's bottom rib.
18.104.22.168 For the Fixed Height Experiment: The whole shuttle shall be below 1.15 metres from the surface of the court at the instant of being hit by the server's racket.
The shaft and the racket head of the server's racket at the instant of hitting the shuttle shall be pointing in a downward direction.
The movement of the server's racket shall continue forwards from the start of the service (Law 9.2) until the service is delivered (Law 9.3).
7.5.The Service Judge, when appointed, shall administer any change of shuttle under the Umpire's instruction and ensure that a sufficient quantity of shuttles is readily available throughout the match in order to avoid delays during play.
7.6.The Umpire may arrange for the Service Judge to perform additional duties such as checking that the posts are on the doubles side lines (Law 1.5), checking the height of the net if it is deemed necessary or to call the sideline closest to the Service Judge where there is no Line Judge appointed, with the players so advised.
7.7.Where an Instant Review System is in operation, the Service Judge shall check that any challenge is administered correctly by the Umpire, and advise the Umpire before the next rally commences if this is not the case.
7.8.The Service Judge shall back up the Umpire and assist the Umpire as required. The Service Judge shall contact the Umpire immediately if observing a potential mistake committed by the Umpire.