Aircraft
Honeywell APU Upgrade for B737s Lowers CO2 Emissions
A high-efficiency upgrade for auxiliary power units on Boeing 737NG and Max airplanes can lower fuel consumption and emissions by about 2 percent each.
(Photo: David McIntosh)
(Photo: David McIntosh)

Honeywell is introducing a high-efficiency mode upgrade for its 131-9B auxiliary power unit (APU) on Boeing 737NG and Max airplanes. The enhancement, which the company will make available in the second half of this year, employs a more efficient diffuser that regulates airflow to the APU, saving fuel and lowering emissions while increasing inspection intervals, Honeywell said.

With an estimated fuel consumption reduction of about a half-gallon per hour, Honeywell said the improved diffuser can reduce CO2 emissions and fuel costs by about 2 percent each. Meanwhile, time-on-wing increases to 1,500 APU running hours.

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