Duncan Aviation Tech Reps and Sales Reps field many questions regarding inspection intervals. Most often, these pertain to the newer model engines: TFE731-20/-40/-60 and the -5BR. Intervals for the -20/-40/-50/-60 models can be found in chapter five of the LMM 7 Ch 5-20-00 scheduled maintenance checks Table 801.
In the case of classic engine models, the official answer is to reference the following Service Bulletins:
TFE731-2 |
SB 72-3105 |
TFE 731-2C |
SB 72-3630 |
TFE 731-3 & 3A |
SB 72-3106 |
TFE 731-3B |
SB 72-3233 |
TFE 731-3C & 3D |
SB 72-3527 |
TFE 731-4 |
SB 72-3466 |
TFE 731-5R, 5AR, 5BR |
SB 72-3263 |
The basic rules for these classic engines can be best explained as follows:
The MPI can be overrun by 100 hours and the CZI by 200 hours on all of these models of the TFE 731 engine.
In addition to inspection intervals, TFE731 engines are impacted greatly by the life limits of the engine components within them. Read more about it here: Tracking Component Life Limits.
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