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131-9B Auxiliary Power Unit |
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|  | For main engine starting power, pneumatic power and electrical power generation, the highly reliable 131-9B series APU delivers robust performance, increased engine life, and easy maintainability for lower operation and ownership costs. The 131-9B provides quiet operation from noise reduction features integrated into the inlet, compressor and hot section design. |
| | | | A two-stage axial turbine increases engine life and a single starter/generator that uses electrical power to start the APU, but then becomes a generator once the APU is running, the 131-9B provides a cost-effective APU solution for Boeing 737-600/700/800 and 900 aircraft. | | | | Technical Features |  | ETOPS-qualified and certified to start and operate at flight levels up to 41,000 feet. | | Provides 153 lb/min of bleed air at 51.2 psi for main engine starting and environmental control. | | The 90 kW electrical power generator fully meets all system needs up to a flight level of 35,000 feet in the case of an emergency. |
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