WASHINGTON (UPD ) President Kennedy Tuesday signed a long - awaited execu tive order prohibiting racial and religious discrimination in housing built with govern ment grants, loans, mortgage insurance or guarantees. Kennedy said his housing order will go into immediate effect. Asked why he took so long to sign it, the President re plied that he felt this was the best time for such a move to be made. There may be some ad verse reaction, Kennedy said, but I think we will be able to proceed with our housing industry. Kennedy said he believed “some of the fears have been exaggerated’ about the anti discrimination order and in addition he felt the decision was “sound constitutional pol icy. KENNEDY promised dur ing his 1960 campaign for the presidency to issue such an order. He has been critcized sharply for not having issued it before now. The order does not apply to so-called convention al home loans, made by banks and savings and loan associations without govern ment backings. Civil rights supporters and some high ad ministration officials “had urged the President to in clude conventional Jending in the discrimination ban. The President announced he was setting up a commit tee on equal opportunity in housing to look to implemen tation of the order. ‘The order prohibits discrim ination in the sale or lease of government - assisted housing. by virtue of race, color, creed, or national origin, Kennedy said. The order also included housing owned or operated by the federal government. AS OUTLINE by the President at his news con ference, the order will apply to: Single - family and apart ment housing with mortgages insured by the Federal Hous ing Administration or guar anteed by the Veterans Ad ministration. —Low-rent public housing for low-income families sub sidized by the federal govern ment. —Housing In urban renew al projects Which are subsi dized with federal funds. — Housing, such as colleg dormitories and elderly folks' homes, constructed with fed eral loans. It was understood that the order would not apply to sales by individuals of their own homes. Some home builders have expressed concern that they order would create uncertain ty among prospective home buyers and cause a sharp de cline in sales and construc tion. Other builders have been relative optimistic about the order, especially those in states and cities which al ready have anti - discrimina tion laws, barge and cranes to get ma terials to the small islands. The engineers finally abban doned surface transporta tion and decided to use a heli copter. The 1,700-pound helicopter delivered lumber, a compres sor and jackhammers, men and 100,000 pounds of concrete to the island. The concrete, which was the toughest part of the load to deliver, was brought in a 1,000-pound ca pacity steel hopper, attached to the helicopter’s cargo hook by a 25-foot line. The helicop ter made the half-mile haul in winds sometimes gusting at 40 m.p.h. All the concrete, plus the other supply and personnel missions, were flown in just under 14 hots. Contractors plan to use helicopters to sup ply the steel for the towers later in the constriction schedule.