Sheppard Air claims to have questions exactly from the FAA test. I'm wondering what folks think of the Q&A for this one. It asks
In the event of an AHRS failure, what becomes your primary pitch instrument?
The given answers are
- PFD altimeter
- Standby altimeter
- Standby attitude indicator
I thought (2) was correct, but they give (1).
What I find puzzling about this choice is that the AHRS is a measurement system that displays its output on the PFD. So if the AHRS has failed, the PFD will too. The section of the FAA handbook in their explanation refers to using the PFD altimeter for partial panel attitude reference, but says nothing about the context being failure of the AHRS. I'm wondering if I misunderstand what's meant by "PFD" and "AHRS", or is this just stupid FAA word games? (Or a Sheppard Air mistake?)