This document discusses, in broad general terms, typical present instrumentation practice for post-overhaul gas turbine engine testing. Production engine testing and engine development work are outside the scope of this document as they will typically use many more channels of instrumentation, and in most cases will have requirements for measurements that are never made in post-overhaul testing, such as fan airflow measurements, or strain measurements on compressor blades.
The specifications for each parameter to be measured, in terms of measurement range and measurement accuracy, are established by the engine manufacturers. Each test cell instrument system should meet or exceed those requirements. Furthermore, each instrument system should be recalibrated regularly, to ensure that it is still performing correctly.
Rationale: AIR5026 is being revised per the five year re-affirmation requirement. This revision will update the document to reflect test cell instrumentation and hardware currently in use and available for use in post-overhaul gas turbine engine testing. Some of the advances in measurement systems and hardware are included in this update.