Quite possibly, yes. Look in your contract/supplement under workweek. Even if isn't in there, your seniority rights should be protected under effects bargaining. Call your union hall.
The preamble to Art 40 states that it supercedes any language contained in any suppliment, rider, or addendum.
Any Art 40 air operation issue related will fall under its language unless in direct contridiction of State or Local law.
If not addressed in Art 40, subsequent language in other articles and suppliments can apply.