May 29, 1982

Pope John Paul II today began a six-day pastoral visit to Britain, the first by a reigning Pope in the 1,900-year history of the papacy. He appealed to Britain and Argentina ''to put aside the weapons of death'' in the Falkland Islands. The war in the South Atlantic prompted John Paul to call for peace again and again as he moved from Gatwick Airport south of London to a mass in Westminster Cathedral to an audience with Queen Elizabeth II at Buckingham Palace to a service for the sick and dying in Southwark Cathedral. At the airport, he fervently urged ''all people of good will to join me in praying for a just and peaceful settlement.''

The Reagan Administration said today that the plan of the Metropolitan Transportation Authority to buy 825 subway cars from Canada violated international trade agreements. And it said that it was considering ''all of our options'' for action against the Canadian Government and the manufacturer. The Administration's views were expressed at a hearing of the Senate Finance Committee by Donald E. deKieffer, general counsel of the Office of the United States Trade Representative. He said the trade agreements had been violated because the financing provided by the Canadian Government was at an interest rate belowthe one set by industrialized countries in the Organization for Economic Cooperation and Development.

British forces have captured Darwin and Goose Green, overrunning the second largest Argentine installation in the Falkland Islands, the Defense Ministry announced tonight. Victory over the well-fortified Argentine garrison of 1,000 men would constitute a major military success for the British a week after the establishment of their first beachhead in the Falklands. And gaining the two settlements, which occupy a small isthmus on the main southern route from the beachhead to Stanley, would carry the added prize for the British of an airstrip, at Goose Green. Later, the Argentine high command issued a communique saying that Argentine ground and air forces were battling to repel British troops trying to secure a position in what was described as heavy fighting around Darwin and Goose Green. The communique said British ground forces had air and naval support. The Argentines first said the British attackers had been beaten back, but later that they had returned with reinforcements and were conducting an active battle around Darwin. (Page 4.)

A masked man drove a car through the glass lobby doors of an I.B.M. building here today and went on a shooting spree, killing two workers and stalking and wounding at least eight others as they cowered in office cubicles and corridors. Seven hours later, after negotiating by telephone with the police, the man emerged from an office in the building and surrendered quietly. Police Chief Bernard Crooke of Montgomery County identified the gunman as Edward Thomas Mann, 38 years old, a former salesman for the International Business Machines Corporation. The chief said that Mr. Mann, who lives in Mitchelville, Md., about 30 miles from here, had been armed with two rifles, a shotgun and a pistol.

The United States Court of Appeals yesterday ordered an end to a civil trial in Federal District Court in Manhattan and expunged the testimony given in it by the Rev. Sun Myung Moon. It also ruled that the testimony could not be used against Mr. Moon in any other civil or criminal case. In its unusual ruling, the court said in addition that the Unification Church, which is headed by Mr. Moon but was not a party in the civil suit, must pay all legal fees incurred by the defendant in the course of the three-year-old case. The church had agreed to this stipulation.