Originally Posted by
A Squared
You're probably correct that "degrees" doesn't appear in *operational* publications, But I would speculate that you would find "degrees" in design/engineering/maintenance publications, and that's probably where the numbers in the AD come from; drawn directly from the design specs for the MCAS.
If it's any help, typical values for older 737s (may vary for the NG/Max, but unlikely to be much different) are:
Max downwards stab (i.e. a/c nose up) angle: -12.9°
Max upwards stab (i.e. a/c nose down) angle: +4.2°
A stab angle of 0° corresponds to 4 units of nose-up (ANU) trim at the lever. Presumably the purpose of ANU units is simply to avoid confusion between positive and negative values, so it may well be that each ANU unit increment = 1°.