Duncan Aviation Engine Tech Reps and Sales Reps field many questions regarding engine 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 5 of the LMM 7 Ch 5-20-00, Temporary Revision 5-18. Some of the qualifications for the longer intervals can be done without any actual work on the engine. The intervals can actually go backward to a shorter interval at a shop visit if particular requirements are not met.
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:
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: How To Track Life Limits For Honeywell TFE731 Internal Components.
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