Early Turbine Engine Experience
Jet turbine engines in the 1950s and 1960s demonstrated that they had much higher thrust and reliability than any then-available piston engines. Pratt & Whitney jet engines were then reliably powering the 2-engined Boeing 737 series, the 2-engined DC-9 and 3-engined Boeing 727. The 60-minute rule was waived in 1964 for 3-engined aircraft. This opened the way for the development of wide-body intercontinental trijets such as the Lockheed L-1011 Tristar and DC-10. By then, only 2-engined jets were restricted by the 60-minute rule.
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