Geared turbofan with over-speed protection

A gas turbine engine comprising:

• a fan shaft rotatable about an axis, a fan connected to said fan shaft, and an outer housing surrounding the fan to define a bypass passage;
• a compressor section having both a low pressure compressor that is fixed to rotate with the fan shaft and a high pressure compressor;
• a turbine section having a low pressure turbine driving a low speed spool and a high pressure turbine driving the high pressure compressor;
• a fan drivetrain including a geared architecture connecting the low speed spool to the fan shaft such that the fan and low pressure compressor rotate at a lower speed than the low pressure turbine;
• and
• a tower shaft rotatably driven by the low speed spool.

A gas turbine engine comprising:

• a fan shaft rotatable about an axis, a fan connected to said fan shaft, and an outer housing surrounding the fan to define a bypass passage;
• a compressor section having both a low pressure compressor that is fixed to rotate with the fan shaft and a high pressure compressor;
• a turbine section having a low pressure turbine driving a low speed spool and a high pressure turbine driving the high pressure compressor, the low pressure turbine including rotating blades and a static structure aft of the rotating blades;
• a fan drivetrain including a geared architecture connecting the low speed spool to the fan shaft such that the fan and low pressure compressor rotate at a lower speed than the low pressure turbine;
• an aft-loaded thrust bearing axially aft of the gear architecture and forward of the high pressure compressor;
• a tower shaft rotatably driven by the low speed spool at a location axially aft of the thrust bearing and forward of the high pressure compressor, the tower shaft rotatably driving an engine accessory component and engaging with a braking mechanism;
• and
• at least one sensor for detecting a fan drivetrain failure event and communicating to a control, wherein the control initiates a fuel shutoff procedure and activates the braking mechanism if the fan drivetrain failure event is detected.