Do I need a Quality Manual?

The short answer..."maybe."

ISO9001:2015 and AS9100D no longer require a "Quality Manual." Of course there are required documented information and the these standards suggest that you can place this information into a single document called a "Quality Manual." What do your customers expect? They are still very likely yo expect you to have a Quality Manual. In this case, you'll need one.  What works for your organization? However you structure your QMS, it must work for you and your customers.

Often, the Quality Manual is a worthless rewrite of the ISO or AS standard.  Don't waste your time! If you are writing a Quality Manual, make it meaningful, tell something that is helpful to the organization.  You don't need 54 pages of fluff. Here is what you must have if you decide that a Quality Manual is right for you...

A cover page with company name, document name date, revision and approver's signature.

Documented information to support the operation, i.e. list of your procedures.
A general description of relevant interested parties and their requirements.
The scope of the quality management system, including boundaries and applicability.
A description of the processes needed for the quality management system and their application throughout the organization;
The sequence and interaction of these processes;
Assignment of the responsibilities and authorities for these processes.

Remember, ISO and AS are about defining processes (and the requirements) and managing risks. Manage risks by identifying them and mitigating them.