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 B737: AUXILLARY POWER UNIT (APU) - Blogger
2013年6月25日 · The 737 NG APU is immediately recognisable by the new "eductor" cooling air inlet above the exhaust. This and the new silencer makes the NG APU 12dB quieter than the classics. The eductor works by using the high speed flow of the APU exhaust which forms a …
boeing 737 - Why doesn't the 737 MAX have an APU EGT gauge ...
2021年9月26日 · 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").
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 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.
Auxiliary power unit - Wikipedia
Honeywell has a 65% share of the mainliner APU market and is the sole supplier for the Airbus A350, the Boeing 777 and all single-aisles: the Boeing 737 MAX, Airbus A220 (formerly Bombardier CSeries), Comac C919, Irkut MC-21 and Airbus A320neo since Airbus eliminated the P&WC APS3200 option.
737 MAX APU Inlet Door - Airliners.net
2021年12月16日 · Any insight as to why the MAX APU inlet door was changed? The door is open 45* in ground mode, and 17* when in the air. A MAX can be dispatched with door in-op for a 1% fuel burn penalty at 17*. I suspect (but don't know) the change is related to weight savings and improved reliability, especially with high winds on the ground.
WARNING: MAX-7/-8/-9/-10 MODELS HAVE A SPRING LOADED UPWARD SWINGING OVERWING EXIT DOOR IN LIEU OF A HATCH. FOLLOW THE OPENING PROCEDURE INDICATED ABOVE TO AVOID INJURY. Make Sure All Persons and Equipment Are Clear of the Door. Do Not Open the Door When the Airplane Is Pressurised.
New Technologies Drive APU Performance Improvements
2024年10月7日 · 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 - APU - SmartCockpit - Airline training guides ...
In flight, if the APU is the only source of electrical power, all galley busses are automatically shed. If electrical load still exceeds design limits, both main busses automatically shed until the load is within design limits. On the ground, the APU attempts to carry a full electrical load.