Honeywell upgrade for aircraft auxiliary power unit lowers fuel consumption and co2 emissions

Improvements to the 131-9b apu enable more efficient operation and new savings for operators of boeing 737 aircraft phoenix , june 19, 2023 /prnewswire/ -- honeywell (nasdaq: hon) has unveiled a new high-efficiency mode (hem) upgrade for its 131-9b auxiliary power unit (apu) for boeing 737 aircraft. hem is enabled by an innovative and highly efficient diffuser, controlled by software that autonomously regulates airflow to the apu compressor section.
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