Earnings rose at Fairchild Industries Inc., a diversified aerospace and high-technology company. Fairchild reported earnings for its fiscal third quarter ended Sept. 27 of $14.2 million (77 cents a share) compared with $13.2 million ($1.03) for the same period last year. Nine-month earnings were $59.7 million ($3.23) compared with $39 million ($3.05) a year ago.

Third-quarter sales were $305 million compared with $204 million a year ago. Nine-month sales were $977 million compared with $621 million during the first nine months of 1980.

Officials of the Montgomery County firm said that higher sales and earnings reflected the merger in November 1980 with VSI Corp, which manufactures aerospace fasteners and tooling for plastics and hardware.

The 1981 earnings include an after-tax gain of $18.4 million (99 cents) from the June 15 sale of Fairchild's investment in Bunker Ramo Corp. But company officials said that the gain was offset substantially by lower-than-anticipated earnings from the company's government and commercial aircraft programs.

Baltimore Gas & Electric Co. earnings dipped for the third quarter, although its profit for the first nine months, ended Sept. 30, has increased.

BG&E reported third-quarter net income of $50,530 ($1.30) down from $55,997 ($1.56). For the first nine months, BGE made $125.5 million ($3.19) compared with $113.3 million ($3.01) a year ago. The company reported operating revenue of $1.06 billion compared with $922.9 million a year before.

For the 12 months ended Sept. 30, net income was $151.6 million ($-3.83) compared with $131.3 million ($3.41). Operating revenue of the Baltimore-based utility firm was $1.37 billion compared with $1.17 billion a year ago.

First Maryland Bancorp of Baltimore, the holding company for First National Bank, reported third-quarter operating earnings of $5.87 million ($1.14 a share) compared with $5.39 million ($1.03) a year earlier. Nine-month operating earnings increased 8 percent to $17.51 million ($3.40) from $16.51 million ($3.14), while net income rose to $17.23 million ($3.34) from $16.18 million ($3.08).

Assets on Sept. 30 were $2.8 billion compared with $2.47 billion a year ago. Deposits rose to $2.07 billion from $1.82 billion, while loan volume increased to $1.64 billion from $1.5 billion. On Sept. 4, First Maryland acquired First National Bank and Trust of Western Maryland.

Roanoke-based Dominion Bankshares Corp. reported third-quarter earnings were off a bit to $5.5 million (64 cents a share) from $5.6 million this time last year. Its nine-month picture was better, though, with income before securities transactions rising to $16.8 million ($1.94) from $16.4 million ($1.93) for the first three quarters of 1980.

The two Washington-area banks owned and managed primarily by women posted banner results for 1981. First Women's Bank of Maryland, based in Rockville, said nine-month profits rose to $221,921 ($1.85 a share) compared with $11,043 (9 cents) in the 1980 period. And Women's National Bank of Washington listed nine-month profits of $200,000 ($2 a share) compared with $111,000 ($1.11).

In the third quarter, First Women's earned $44,127 (37 cents) compared with a loss of $19,210 for the 1980 period. President Eve Grover credited a strong growth of deposits and earning assets for the sharp increase in profitability, with assets up to $13 million from $7 million a year ago. The bank was founded in 1979.

Women's National officials could not provide third-quarter results. Assets of the D.C. institution, which opened in 1978, were $15.86 million on Sept. 30.

Media General Inc., which publishes Richmond's newspapers, reported net income for the third quarter of $7.704 million ($1.08 a share) compared with $6.854 million (95 cents) a year before. Nine-month earnings were $22.798 ($3.18) versus $20.787 million ($2.88) last year.

Revenues for the third quarter were $88.35 million compared with $83.14 million last year. For the nine months they were $267.30 million versus $245.50.

Computer Data Systems Inc. of Bethesda, a professional and processing services firm, reported earnings fell to $200,500 (28 cents a share) in the first quarter of its fiscal year ended Sept. 30 from $249,600 (35 cents) a year earlier. Sales dipped to $4.08 million from $4.1 million. President Clifford Kendall said revenues and earnings were affected adversely by start-up costs for a new contract with the General Services Administration and other new orders, which added 300 employes to the CDS payroll this month.

CACI Group of Arlington said profits rose 60 percent in the first quarter of its new fiscal year ended Sept. 30. The management consulting and computer services firm earned $697,216 (67 cents a share) compared with $436,544 (42 cents) as sales rose 63 percent to $18.2 million.

Overnite Transportation Co. said third-quarter operating profits rose to $6.6 million ($1 a share) from $5.1 million (78 cents) a year ago as revenues increased to $77.4 million from $60.4 million. A one-time gain for the Richmond trucking company in the recent quarter made final net income $11.9 million ($1.80), while a one-time loss last year produced a net loss of $5.2 million.

General Kinetics Inc. of Rockville, which provides magnetic-tape-maintenance services and manufactures food-texture-testing devices, reported a net loss of $4,626 in the year ended May 31 compared with profits of $68,550 (8 cents a share) the previous year. Sales rose to $3.8 million from $2.8 million. The lower profits resulted from expansion of a metal products division and a new manufacturing plant in Florida. GKI's backlog of orders stood at $3.6 million on May 31 versus $2.4 million a year earlier.