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Reliability, Availability and Maintainability
3-3
Table 3-2
RAM Statistics for Roll-Royce Avon, RB211 and Trent Engines – All Duties
Model
& Year
Availability
(%)
Reliability
(%)
Service
Factor
(%)
Service
Hours/Start
Starting
Reliability
(%)
Average
Load
(MW)
Forced
Outage
Factor
(%)
Scheduled
Outage
Factor (%)
Unscheduled
Outage
Factor (%)
Mean
Time
Between
Failure
(Hours)
Mean
Time
To
Repair
(Hours)
Avon
2005
97.5 99.4 81 215 93 N/A 0.6 1.7 0.2 423 3
RB211
2005
83.4 86.8 64 159 97 20 13.2 2.9 0.5 285 453
Trent
2004 82.1 86.1 24 28 82 47 13.9 3.9 0.1 59 18
Trent
2005 75.0 88.7 17 14 87 46 11.3 4.9 8.8 38 35
Average values compiled from Operational Reliability Analysis Program (ORAP). 2005. MTBF and MTTR include both forced and unscheduled Maintenance
hours. High MTBF of RB211 due to a single event requiring 4,416 hours before restored to operation.