FAA Aviation Mechanic General (AMG)Aircraft Drawings, Weight and BalanceMedium
A technician compares two prints of the same engineering drawing and notices they carry different revision letters. Where on the drawing should the technician look to find a description of what was changed, when, and by whom?
- ARevision block
- BBill of materials
- CZone chart
- DTitle block
Show answer & explanationAnswer & explanation
Correct answer: A. Revision block
The revision block is a separate table, usually near the title block, that records each revision letter or number along with a description of the change, the date, and the approving authority, allowing tracking of a drawing's history.
Why the other options are wrong
- B. A bill of materials lists parts and quantities, not the history of drawing revisions.
- C. A zone chart helps locate items within numbered aircraft zones, not drawing changes.
- D. The title block identifies the drawing but does not detail specific revision changes.
Revision Block
A table on an engineering drawing that records the history of changes, including revision letter/number, description of change, date, and approval.
- Located near the title block
- Tracks revision letter/number sequence
- Records date and approving authority for each change
Memory trick: Revision block = the drawing's 'diary' of every change.