THE Lands Tribunal presiding officer, Judge Cruden, yesterday called for extensive revision of a law which he claimed forced the eviction of hundreds of tenants every year. He said that Part IV of the Landlord and Tenant Ordinance was also sometimes unjust to landlords, preventing the facts being discussed before the Lands Tribunal. Once a landlord has served a form known as a CR101, the tenant must apply to the Lands Tribunal for renewal of tenancy before the date shown on the document. If he does not, the tribunal has no power to extend the time limit - or the tenancy. Judge Cruden pointed out that an increasing number of properties were affected by Part IV of the Ordinance as rateable value limits had progressively been reduced. Previously, Part IV tended only to concern business and luxury premises. Other properties had been affected only by the much simpler rules of Part II, which did not require tenants to take the initiative. Judge Cruden said the problem was compounded by the fact that ''for purely historic reasons'', Legal Aid was available for cases under Parts I and II but not under Part IV. Ruling on an application by tenant Mr Tsui Wing-chung, Judge Cruden said in this case it was the landlord, Ms Anna Ho, as agent for Mr Charles Ho Mook, who had been prejudiced by Part IV. The judge said that reluctantly he was forced to grant a new tenancy for two years from April 1 this year, despite the fact that rent had been persistently paid late - sometimes by two or three months. Judge Cruden found that a second form sent by the landlord could not overrule an earlier one that had not opposed tenancy renewal. Judge Cruden said: ''This application is yet another case, bedevilled by the far more complex Part IV procedural machinery, which again prevents the tribunal being able to determine on its merits, the real factual issue between the parties.'' But he added: ''In the majority of applications where the tribunal is unable, because of procedural defects or problems, to deal with the real factual dispute between parties, it is the tenant who tends to be prejudiced.''