The Trump Shuttle made less noise than usual here Wednesday with its announcement that it is the first passenger airline to install "hush kits" on its Boeing 727-200 aircraft to meet new federal standards.

In an event that could have importance for both passenger and cargo operations, the first of the quieter jets equipped with engine noise modification kits made by Federal Express Aviation Services Inc. and Pratt & Whitney took off from Logan International Airport following Federal Aviation Administration approval of the kits for Pratt's JT8D-7 engines last month.The kits, which meet new federal Stage 3 noise standards, make the 727s ''significantly" quieter than Trump's unmodified planes, according to the companies.

At ground level, exhaust noise is noticeably less although intake noise

from the front of the aircraft's three jets appeared to be about the same.

Richard F. Cozzi, Trump vice president of operations, said the airline spent $1.7 million to retrofit the first of its 20 aircraft, which range in age from 16 to 20 years. The company intends to modify four planes this year and eight more in 1991 for use on the Boston-New York-Washington route, Bruce R. Nobles, Trump president, said.

The hush kits are bound to be a growing business for Memphis-based Federal and Pratt & Whitney, a unit of United Technologies of East Hartford, Conn. The companies already have firm orders from five customers, officials said.

The JT8D engine is considered the workhorse of the industry, in service on about 4,400 aircraft with some 350 operators around the world, Pratt & Whitney said. In order to meet the new federal noise rules, most operators will probably have to choose between installing hush kits or replacing the engines, Mr. Cozzi said.

Under the complex federal rules, operators in the Boston area will have to attain average noise levels for their fleets over the first half of this year either by using quieter engines or by reducing weight to lower the noise coming out of the engines, Mr. Cozzi said.

The alternative of reducing weight would mean that operators would have to choose between cutting passengers, baggage, cargo, or fuel loads, which would reduce aircraft range, he said. The choice of reducing weight to meet noise standards could pose particular problems for cargo operators, already prime targets of noise-abatement efforts because of their late-night operations.

The kits could also affect the useful life of older aircraft like those in the Trump fleet, which was purchased along with the business from Eastern Airlines.

Mr. Cozzi said the company is still in the process of deciding whether it will buy new planes for its fleet. In the meantime it is going ahead with

plans to meet the noise standards. With proper maintenance, there is no limit to the useful life of 727s, Mr. Cozzi said.

The Trump hush kits are being installed by Tramco, a transport repair and maintenance company in Everett, Wash., under contract to Federal Express.