The Boeing Co. of Seattle, the nation's largest aircraft manufacturer, said yesterday increased orders for its commercial jet planes contributed to record sales and profits in the third quarter and the first nine months of 1977.

Profits for the quarter jumped 75 per cent to $89,875 million (94 cents a share) from $22.7 million (53 cents) for the same period a year agoe. Sales expanded to $891.3 million from $798.7 million.

Nine month earnings nearly doubled to $124.5 million ($2.93) from $65.4 million ($1.54) a year ago on sales of $2.89 billion over 1976's $2.71 billion.

The company said it received 39 jet plane orders in the quarter, raising the nine month total to 183 compared with 144 for the same period a year earlier.

Boeing officials warned that fourth quarter results would be adversely affected by the strike against the company by more than 23,000 members of the International Machinists and Aerospace Workers union, who walked out on Oct. 3.

MCA Inc. reported 11 per cent higher third quarter earnings of $27.7 million ($1.49 a share) compared with $24.9 million ($1.34) a year earlier.

Revenues increased to $225.5 million from $202.2 million.

Lew R. Wasserman, chairman of the entertainment conglomerate, said revenues for the nine months ending Sept. 30 were $608.2 million, the highest in the company's history and an 11 per cent increase from the $574.5 million recorded in the same period of 1976.

He said net income and earnings per shar for the nine months were lower than in 1976, however.

Net income for the first nine months of 1977 was $62.9 million ($3.9) compared with $69.1 million ($2.73) in the first nine months of 1976.