The 737 APU - The Boeing 737 Technical Site
In 2023 Honeywell released a High Efficiency Mode (HEM) upgrade for its 131-9B APU for the 737 NG/MAX. HEM is enabled by a new, highly efficient diffuser, controlled by software that autonomously regulates airflow to the APU compressor section.
Boeing 737 MAX - Wikipedia
The Boeing 737 MAX is the fourth generation of the Boeing 737, a narrow-body airliner manufactured by Boeing Commercial Airplanes. It succeeds the Boeing 737 Next Generation (NG) and competes with the Airbus A320neo family.
boeing 737 - Why doesn't the 737 MAX have an APU EGT gauge …
Sep 26, 2021 · According to an FAA document from Nov 2020 on the 737-800 and 737-8 (aka Max) differences, which was "Approved by the Aircraft Evaluation Division", the removal of the APU EGT gauge does not impact the procedures or flight characteristics and is categorized as level-A ("Self-Instruction").
Honeywell APU Enables More Efficient Operation - Honeywell …
PHOENIX, June 19, 2023 – Honeywell (NASDAQ: HON) has unveiled a new High-Efficiency Mode (HEM) upgrade for its 131-9B auxiliary power unit (APU) for Boeing 737 aircraft.
Honeywell Upgrade for Aircraft Auxiliary Power Unit Lowers Fuel ...
Jun 19, 2023 · The upgrade is intended for any aircraft already operating a 131-9B APU, including Boeing 737-600, 737-700, 737-800, 737-900 and 737 MAX models. It will be available to operators with 131-9B APUs in the second half of this year.
Honeywell auxiliary power unit - Wikipedia
In 2018 Honeywell had a 65% share of the airliner APU market and is the sole supplier for the Airbus A350, the Boeing 777 and single-aisle airliners: the Boeing 737 MAX, Airbus A220 (formerly Bombardier CSeries), Comac C919, Irkut MC-21 and Airbus A320neo after Airbus removed the Hamilton Sundstrand APS3200 option.
The Boeing 737 Technical Site - Home Page
Feb 6, 2010 · Welcome to the Boeing 737 Technical Site. Here you will find technical, operational, and training notes; articles and photos contributed by 737 pilots and engineers from around the world.
New Technologies Drive APU Performance Improvements
Oct 7, 2024 · In April 2023, Boeing certified HEM on 737-600s, -800s and -900s, and 737 MAXs with the 131-9B APU. “Since the release of HEM, Honeywell has modified 1,334 APUs, resulting in fuel savings of...
Boeing 737 MAX - Differences
For more details of the new MAX engine panel click here . APU. The MAX APU is still a Honeywell 131-9[B] but is updated to series 41 which has various minor improvements such as improved starting reliability.
Honeywell APU Upgrade for B737s Lowers CO2 Emissions
Jun 19, 2023 · 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.