What is indicated by the code 4R 4B in a compressor?

The code 4R 4B in a compressor specifically refers to the location and type of bearing within the compressor assembly. In this notation, the "4R" indicates the rear bearing, while "4B" signifies the bearing type, which helps technicians understand the components they are working with during maintenance or inspection activities. Knowing the exact designation of these components is crucial for troubleshooting, maintenance, and ensuring optimal performance of the gas turbine engine.

The other options pertain to different aspects of engine functionality and components but are not related to the code provided. For instance, fuel injector location would refer to where the fuel injectors are situated for proper combustion, and engine power rating relates to the overall output power characteristics of the engine. Meanwhile, temperature sensors play a role in monitoring operational temperatures but do not correlate with the specific bearing identification indicated by the code. Thus, understanding the function of each notation is essential for effective operation and maintenance within gas turbine systems.