clandestino:
To set the record straight: horizontal stabilizer is very effective and it has no fixed part whatsoever.
You are right. It is trimmable and it was 13 degrees down (pitching-up). With 107 kts ground speed it could maintain a 16 degrees a/c pitch-up attitude.
Let's get back to automation, then...
P.S.:
Somebody must have asked this before:
If the trim was not performed by the PF but by HAL would the PF be easily aware of this ?