Actually there are multiple responsibilities of the DAC and CAC in the Eagle Adv Process. I've listed most of them in found in the GTA:
EProject refs: 9.0.2.7 It is also acceptable for the coach or the advancement administrator responsible for approvalif he or she becomes concerned the project will not meet the requirements or it will not be completed to the satisfaction of the benefiting organizationto contact the Scout and his parent or guardian and, as appropriate, a representative of the beneficiary.
9.0.2.1 An advancement administrator is a member or chair of a council or district advancement committee, or a volunteer or professional designated according to local practices, to assist in advancement administration.
DAC 3.0.0.2 #13h Help troops, teams, crews, and ships avoid pitfalls as qualified youth strive for Eagle Scout rank, the Silver Award, or the Quartermaster Award.
3.0.0.2 #9 Follow national and local council procedures as prescribed regarding appeals, Eagle Scout and Quartermaster references, service project proposal approvals, boards and bridges of review support, and time extensions.
CAC 3.0.0.1 #11 Determine, according to national procedures, consistent and appropriate methods for approving Eagle Scout service project proposals and fundraising applications, providing Eagle Scout service project coaches, and conducting Eagle Scout boards of review and Quartermaster bridges of review.
8.0.3.0 BOR Particulars for the Eagle Scout Rank
The particulars below pertain only to the Eagle Scout rank.
1. Council advancement committees must determineand make knownmethod(s) for conducting Eagle Scout boards of review: whether unit committees or the council or district advancement committees administer them, and also how board chairpersons are selected.
Other applicable paragraphs relating to CAC/DAC Roles in the Eagle Advancement Process:
8.0.3.1 Eagle Scout Board of Review Beyond the 18th Birthday
8.0.3.2 Initiating Eagle Scout Board of Review Under Disputed Circumstances
8.0.4.0 Appealing a Decision