It had a wider wingspan and a six-cylinder Continental engine, and the fuel capacity was increased to . This year, a total of 439 airplanes were delivered—fewer than the top years of the 1960s, but these deliveries resulted in healthy profits. From this point through 1986, the M20J and the turbocharged M20K were the only two models offered. 1980s General aviation manufacturing experienced a significant downturn starting in 1982. Mooney was affected along with other manufacturers and was forced to downsize through temporary layoffs. Despite the recession, development work continued. The 201 and 231 received more improvements, including significant reductions in cabin noise levels. In 1982, deliveries fell to 218 units, and in 1983 only 154 aircraft were produced. The United States Air Force announced a competition to develop a replacement for the Cessna T-41 trainer, and Mooney immediately began to develop a military trainer based on the 231. While the company was dealing with the recession, Republic Steel was acquired by the Ling-Temco-Vought corporation and dropped Mooney. The company ended up in the hands of Armand Rivard of Lake Aircraft and Alexandre Couvelair, a Mooney dealer from Paris. Sales continued to fall, totaling 143 in 1984 and 99 in 1985. The next new model, the M20K 252, appeared in early 1986 with a top speed of . It replaced the 231 and achieved its higher speed with the same engine. It featured a new 28-volt electrical system to power additional equipment and to improve cold-weather starting. The Continental TSIO-360-GB engine in the 231 had required specific pilot training and modified takeoff and climb procedures to operate at acceptable engine temperatures in hot weather. Because of this, the 252 received an intercooled TSIO-360-MB engine. The various improvements were copied to the 201 airframe, and the new 205 model was released in 1987. This was followed in 1988 by the M20L PFM, powered by a Porsche PFM 3200 engine which had been developed from the 911 Carrera engine. The maximum speed with this configuration was . The fuselage was stretched to form the first long-body M20. One new feature on this airplane was the replacement of the throttle, mixture and propeller controls with a single power control; mixture and propeller rotation speed were automatically adjusted based on the setting of this single control. The Mooney PFM did not last, with a total of 41 units having been manufactured in 1988 and