THE MOT TEST – Seat Belts
Thursday, May 31st, 2007Without any doubt the introduction of vehicle seat belts has saved many from serious injury or even death, so their inclusion into the MOT test in 1969 for front seat belts and extended to cover rear belts in 1991 was to many a foregone conclusion.
The regulations relating to seat belts are relatively complex in that they change markedly with vehicle age and type, for example prior to 1965 no belts were required at all and before April 1981 no rear belts were needed. Further complications exist regarding the type of belt i.e. lap, lap/diagonal, harness etc not only this but rules exist which stipulate whether the belt has to have an inertia mechanism to control slack.
Once through the regulatory minefield the tester then concentrates on a test routine which includes checks on belts presence, condition, lock effectiveness, working of any inertia reel system and also the vehicle structure within 300mm of any mounting point (the prescribed areas). During examination the belt must be pulled out to its fullest extent and allowed to retract with minimal assistance. The condition of the belt webbing is examined with particular attention given to any fraying which must be to the extent that the belt is clearly weakened, any cut which causes the fibres to separate as well as weakening the units’ effectiveness as a safety device. The condition of all locks, flexible STALKS and height adjusters are also checked to ensure that they are present and effective; this will include all seating where the belts are attached to the seat structure.
Many modern vehicles have seat belt pre-tensioners which are basically small explosive devices designed and fitted to the seat belt mechanisms to automatically tighten the belts in the event of an impact. Should these devices have been deployed a “flag� normally displays at one or more mounting points signifying such, this situation is not an MOT fail point but the owner should be notified via issue of an advisory notice.
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