Flood Zone Mapping Accuracy

I have a project where the subject parcel is in two flood zones, A and unshaded X. The FIRM delineates the limits of the zone A area. My client is proposing a new house, approximately 120' outside of the zone A designation, based upon overlaying the zone A limits using relatively precise aerial data.

My question: Does FEMA give any guidance regarding the accuracy of zone A delineation? FYI - this is an area in which FEMA issued new maps last year, so it's up to date with regards to mapping.

Thanks in advance.