A Security Officer may only search a person, be it aircrew, other airfield personel ,or SLF with their consent. If you refuse a search by that guard he should then offer you the chance to be hand searched by one of his colleagues, If you then refuse this search, he must offer you the chance of a private search in the presence of one of his fellow officers.
If you then refuse then you WILL be refused entry into the restricted Zone.At which point the Police will be Informed and you may find that getting onboard the aircraft will be a long drawnout set of procedures.