This page highlights some of the key differences between the 737 MAX and the NG. I will be adding to this page as I discover new differences.
*** Updated 17 Jan 2017 ***
Boeing will certify the Max series under an amended type certificate as part of the 737 family rather than go for a whole new type certificate.
The MAX has a CFM LEAP-1B fan with a 69.4 inch fan diameter. It will have a 11-12% reduction in fuel burn and 7% reduction in operating cost compared to the NG. The nacelle and pylon will cause the engines to project further forward than the CFM56-7BE on 737NG.
There is a new Ground wind operating envelope found in Aircraft General Operating Limitations:
There are two new crew alerts on the inboard DU of THRUST and FUEL FLOW
In simple terms THRUST will illuminate if the actual thrust is more or less than the commanded thrust and FUEL FLOW will illuminate if the actual fuel flow is abnormally high compared to the FMC expected fuel flow.
Note that the entire block will blink for 10 seconds then remain steady amber for as long as the condition exists.
For more details of the new MAX engine panel click here
The EGT gauge has been removed from the APU panel on the overhead panel and the blue MAINT light has been changed to an amber DOOR light.
Illumination of the DOOR light simply means that the door is not in the commanded position. The APU can continue to be used but some buffeting may be experienced and a fuel burn penalty of 2.4% should be applied.
The big difference is the 4 new 15.1 inch displays. In the central 4 inch gap between display 3 & 4 has been squeezed a smaller gear lever along with a lock override button, nosewheel steering selector, gear indication lights and placard speeds. The ISFD is above the gear panel. The flap position indicator is now part of the electronic displays. The autobrake and MFD selectors and brake pressure gauge have moved down to in between the FMCs. The PFD/MFD transfer switches are on the lighting panels in front of the control column.
The EFIS control panel now has a +/- range selector. VSD is selected from the centre button.
For a full list of MAX flightdeck differences with photos click here
FMC Update 13 was designed for the MAX and has been used as 13.0 on the test fleet. U13 software brings the baseline of U11 and U12 to the 737MAX and does not include any new functionality for the 737NG.
A few things unique to the MAX:
For more details of the FMC Update 13 click here
FBW Spoiler System
The MAX has a new fly-by-wire spoiler system. This is officially to improve production flow, reduce weight and improve stopping distances.The spoiler mixer unit has been replaced by a Spoiler Control Electronics (SCE) unit and the ground spoiler control valve is replaced by a Ground Spoiler Control Module (GSCM).
Here are some of the new features that system brings.
For more details of the MAX FBW Spoiler system click here
BLEED TRIP OFF lights renamed BLEED
The PSEU light has been changed to MAINT. Its function is similar to the PSEU light.
The following MAX variants are being offered: