The attached link makes for important reading. It was impossible for the examiner to be sat forward facing and secured in their seat whilst observing. The pilot seats are screened off from the passenger seats. The examiner in this situation would have to be sat sideways on a rear facing passenger seat, with a slackened harness, whilst peaking through the central access. I believe the FAA changed the rules following this accident to prevent FAA examining from the rear seats.
https://www.baaa-acro.com/crash/cras...rside-1-killed