CFM doesn't underestimate the value of reliability to operators
CFM doesn’t underestimate how much the dependability of aircraft engines is worth. Like our customers, we know one engine-caused event can set off a costly domino effect of lost revenue, subsequent flight delays, loss of airline image, and passenger compensation.
In today’s high-cycle airline environment, CFM’s reliability advantage over the competitor can mean hundreds of thousands of dollars in savings for customers.
CFM reliability (current production engines)
A CFM56-7B engine in-service with TUIfly achieved 42,675 hours on wing without a shop visit. As of July 1, 2010 the engine was still on wing.
Current average CFM56 shop visit rate is .03, which translates to approximately 30,000 hours on wing before the initial shop visit.
Over the life of the product, a CFM56 engine will undergo just three shop visits. This data is based on current engine performance; on average these engines accumulate about 3,000 flight hours per year. Based on predicted reliability ratings, the engines could remain on wing for up to 10 years before requiring an initial shop visit. Individual airline results will vary depending on specific operational parameters.
CFM56 Reliability Rates
12 month Rate ending 12/31/10 | QTY of Events
| Engine | Aircraft | Unpl. Removal ** | Shop Visit ** | I.F.S.D ** | Departure Reliability *** |
| CFM56-3 | B737-300/400/500 | 0.039 | 0.078 | 0.004 | 99.99% |
| CFM56-5A | A319/320 | 0.029 | 0.082 | 0.004 | 99.99% |
| CFM56-5B | A318/319/320/321 | 0.017 | 0.030 | 0.002 | 99.98% |
| CFM56-5C | A340 | 0.033 | 0.063 | 0.004 | 99.86% |
| CFM56-7B | B737NG | 0.025 | 0.030 | 0.003 | 99.98% |
* All numbers are Total, and include engine causes and other related engine events such as FOD, customer convenience,...
** Per 1000 EFH
*** Per 1000 departures