Boeing 757-200 (N757HW)

This has to be one of the few 757s out there with an Experimental/R&D airworthiness certificate.

Its a strange looking bird alright.

Are they experimenting with Canards or some sort of Avionics" Very interesting.

It's engine testing. normally they have an engine mounted on that pylon.

what is the test block for?

Love the Honeywell Aerospace test aircraft with these appendages they have attached to them on their 'Power of Connected - High-Flying World Tour'.

From the Apex.aero website:
The aerospace industry is going through a digital shift, and Honeywell is leading the way by creating a completely Connected Aircraft and showcasing that aircraft around the world. Over the last 100 years, Honeywell has built much of the technology used in flight and now we’re using our expertise in the industry to enter this new digital era. In particular the Internet of Things is top of mind for all industries and we are making it relevant within aerospace.

Beautifully maintained A/C. Must be fun working on projects with it.

It is rather odd looking. It "lives" about 200 meters north of the center of the north runway (8/26) at KPHX. If you check it out in Google Earth there is also a picture of its predecessor, on old 707, with the same extension hanging off the side.