Specific Service Bulletins (e.g., SB 73-0122) define approved CIS fuels and additives, often requiring specialized inspection if not using standard fuel. 3. Operational Improvements (7B Series)
Reports of Hydromechanical Unit (HMU) failures caused by corrosion and seizure of the delta P valve when operating on TS-1 fuel. Action: Cleaning, inspection, and repair of affected HMUs. CFM56-73.rar
Enhancements implemented for increased efficiency and reliability. Specific Service Bulletins (e
Based on the search results, the request relates to the engine series (used exclusively on Boeing 737 Next-Generation aircraft) and specific maintenance or service bulletin (SB) documentation, often found in technical data archives (like those mentioned in the search for .rar/PDF files). Action: Cleaning, inspection, and repair of affected HMUs
Service bulletins under chapter 73 typically cover Engine Fuel and Control.
Software versions designed to keep Variable Bleed Valve (VBV) doors closed at high power to reduce fuel consumption.
Enhancements to sensor systems to prevent engine stalls, specifically addressing T12 sensing circuits.