The 28B545-9 is an ETOPS-certified APU starter/generator by Honeywell Aerospace for Boeing 737 series, combining APU starting and electrical generation functions in a single, reliability-focused unit for extended-range operations.
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Overview
Honeywell 28B545-9 is an Auxiliary Power Unit (APU) starter/generator designed for the Boeing 737 family. The 28B545-9 performs dual functions: it starts the APU and then provides electrical generation once the APU is running. Certified for ETOPS use, this unit meets elevated reliability standards required for extended-range twin-engine operations and is supplied as a rotable component subject to maintenance, inspection, and overhaul.
Features & Benefits
Dual Functionality: Combines starter motor and electrical generator in a single unit to reduce weight and complexity
ETOPS Reliability: Certified for ETOPS operations, meeting stricter reliability standards for extended-range flights
Honeywell OEM: Manufactured by Honeywell Aerospace, ensuring OEM quality and performance
Proven Performance: Widely used and supported on the Boeing 737 fleet with established service history
Traceability and Certification: Available through approved aviation suppliers with full traceability and certification documentation
Specifications
Part Number: 28B545-9
Manufacturer: Honeywell Aerospace
Component Type: APU Starter/Generator
Aircraft Eligibility: Boeing 737 series
ETOPS Certification: Yes
Function: Starts the APU; generates electrical power
Condition: Available serviceable or overhauled
Output Voltage: 115 V AC (typically 400 Hz), 28 V DC (depends on APU design)
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