TB 1-1520-238-20-86
a. AH-64 aircraft having flown 1750 or more flight hours are susceptible to cracking of the 2L stringer. Previous
fatigue tests conducted on the AH-64 tailboom in a laboratory revealed cracking of the 2L stringer at the equivalent of
1750 flight hours. Unless a doubler reinforcement is applied or the slot area has been closed, the aircraft must be
inspected for cracks before each flight. (See figure 1.)
Figure 1. Inspecting 2L Stringer for Cracks, AH-64 Aircraft
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