3.2.5.2.1. Routine Engine Maintenance
The following maintenance initiatives should be Data - Mission A
considered for all operations. Annual cycles: 1800
Annual Flight Hours: 2700
Engine wash Average sector length (Hours): 1.5
With time, dirt will accumulate on the engine’s fan and compressor airfoils and consequently reduce engine efficiency. Water washes of the engine fan and core are recommended to Data - Mission B Data - Mission C Annual cycles: Annual Flight Hours: Average sector length (Hours): 1500 3000 2
remove this and can often reduce fuel flow by Annual cycles: 1100
0.5% and up to 1% - representing an annual Annual Flight Hours: 3300
fuel cost saving per aircraft typically from Average sector length (Hours): 3
US$24,100 and up to US$51,700 (with fuel at
US$2.00 per US gallon and depending on the mission). Periodic engine water washes also have a positive effect on the exhaust gas temperature margin and consequently on engine overhaul intervals.
Contamination levels depend on the aircraft’s operation and environment, so each operator must optimize their wash frequency. As a starting point, operators are advised to carry out engine washes once a year. Operators wishing to optimize wash frequency may do so by monitoring the effects against and appropriate control data set (e.g. previously accumulated data or a partial fleet at the previous wash frequency).
Engine wash Potential fuel economy per sector (Kilograms)
Mission A (1.5 Hours) Mission B (2 Hours) Mission C (3 Hours)
20 to 35 KGs 25 to 50 KGs 35 to 70 KGs
Figure 3-15
Potential benefits of Engine wash on fuel consumption
Reference document
AMM procedure: 72.00.00 PB701
Check of thrust reverser seal condition
The clean passage air through the engine nacelles (known as the by-pass air) is essential to overall engine efficiency. Seals around the thrust reversers play a crucial role in ensuring that this occurs and that overboard leakage is avoided.
Reference documents
AMM procedure:
CFM: 78-11-11 PB601 78-32-41 PB601
IAE: 78-11-11 PB601 78-32-79 PB601
3.2.5.3. AIRFRAME MAINTENANCE
The airframe is a complex shape and includes many panels, doors and flight control surfaces. In order for the aircraft to perform at its optimum efficiency (i.e. to create the lowest amount of drag), the airframe must be as free from irregularities as possible. This means that surfaces should be as smooth as possible, panels and doors should be flush with surrounding structure and all control surfaces should be rigged to their specified positions.
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