With respect to limitations on AAR etc, the following should have been considered:
Every limitation within the ADS must be directly traceable to a potential hazard identified within the Safety Case, or to a source that shows clearly that it has been introduced for reasons other than safety, eg performance, husbandry. Note, however, that safety may be affected by ‘husbandry’ limitations: eg a reduction in flying hours, to save on fuel or maintenance costs, could lead to lower standards of aircrew currency than had been assumed in the Safety Case, which would therefore needs revision. Limitations that are not already based on the Safety Case cannot be imposed - or relaxed - without appropriate consideration of the continued validity of the Safety Case.
And, as someone once said "Not a lot of people know that", but they should.
sw