Duncan Aviation Engine Tech Reps and Sales Reps field many questions regarding the required inspection intervals for the Honeywell HTF7000/AS907 Series engine.
Inspection intervals are listed in Chapter 5 of the Engine Maintenance Manual (MM). Below is a summary of the AS907 inspection intervals and applicable SBs (Service Bulletins). SB incorporation is determined by engine serial number.
Please note that Chapter 5 of the Engine MM should always be consulted when determining engine maintenance requirements, and the below information should be considered reference only.
| Airframe/Engine Model | Previous Interval (hours) | Extended Interval (hours) | Required Service Bulletins |
| Challenger 300/AS907-1-1A | 4,000/4,200 | 4,800 | AS907-72-9048, R0 |
| 8,000 | 9,600 | AS907-73-A9004, R1 | |
| AS907-72-9044, R4 | |||
| AS907-76-9021, R1 | |||
| AS907-72-9001, R2 | |||
| Challenger 350/AS907-2-1A | 4,000/4,200 | 4,800 | AS907-76-9021, R1 |
| 8,000 | 9,600 | AS907-72-9001, R2 | |
| Gulfstream G280/AS907-2-1G | 4,000 | 4,800 | AS907-76-9021, R1 |
| 8,000 | 9,600 | AS907-72-9001, R2 | |
| Embraer Legacy 450/500 | 4,000 | 4,500 | AS907-76-9021, R1 |
| Praetor 500/600 | |||
| AS907-3-1E | 8,000 | 9,000 | AS907-72-9001, R2 |
| Cessna 700 Longitude/AS907-2-1S | 4,000 | 4,800 | AS907-76-9021, R1 |
| 8,000 | 9,600 | AS907-72-9001, R2 | |
Consult Chapter 5 of the LMM for Manufacturer's Life-Limited Component Replacement Recommendations and Service Life Limits for Critical Components specific to your engine.
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