 The Royal Air Force sought and obtained a number of military specific modifications; including a dispensation from Grob for operating the military variant aircraft to a Max AUW of 908 kg providing an extra 59 kg of useful load.The aircraft was not modified to allow this and no changes to the operating procedures were required as the centre of gravity constraints were not exceeded.Grob have applied to EASA for permission to have an exception to the design standard (CS22) for the Grob 109B which would allow it to be certified to a similar 903 kg Max AUW however while the two objections received were rejected by EASA the authority has not yet taken the necessary rulemaking action to allow this.