DSO Cycles (Design Service Objective) - Not limited to with prescribed service checks and increased inspection frequency.
Boeing:
707 20,000
727 60,000
737 75,000 Classics
737 75,000 NG
747 20,000
757 50,000
767 50,000
777 40,000
Per Boeing - "Structure is designed to exceed the DSO with modest increase in maintenance costs"
In Service and Test Fatigue Figures:
707 50,000
727 170,000
737 150,000 Classics
737 225,000 NG
747 60,000 (744)
757 100,000
767 100,000
777 120,000
Mcdonnell Douglas DSO:
DC-9 40,000
MD-80 50,000
MD-90 60,000
MD-11 20,000
Airbus LCF:
A300 48,000
A300 B4 40,000
A300 B42 34,000
A300 B46 30,000
A310-200 40,000
A310-300 35,000
A319 48,000
A320 48,000
A321 48,000
A330 40,000
A340 20,000
For the DC-9 series including the MD-80 and MD-90 the major fatigue life cycle figure has been demonstrated at no less than
208,000 cycles.
Mr. Douglas company did indeed produce some of the worlds most durable aircraft - many of which are still lumbering safely about today.
Anyone care to post actual Tri-Star figures ? My memory agrees with you all that the Tri-Star was indeed a high cycle machine as can be the A300 series with proper maintenance and care.
Cheers !
Edited for mystery spelling error