Aircraft Drawings Oral Exam Questions and Answers
Practice explaining what a drawing tells you before interpreting a part or a system. These questions follow General subject AM.I.B, Aircraft Drawings, with prompts on drawing types, dimensions, revisions, lines, and schematics.
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What should my answer explain?
Start with the kind of drawing in front of you. Then identify the information the question asks for: part details, assembly relationships, installed location, or system operation.
When rehearsing a tolerance question, state the nominal dimension, each allowance, the two limits, and the total tolerance. For a revision question, explain where you would look and what information you would read.
FAA-S-ACS-1, p. 3, AM.I.B
Use these prompts alongside the ACS codes on your Airman Knowledge Test Report (AKTR). Rehearse an answer before opening the cited source to check it.
Which ACS elements do these questions practice?
The table identifies the elements used below. It is not a prediction of your assigned questions.
| ACS element | Study focus |
|---|---|
| AM.I.B.K1 | Drawings, blueprints, sketches, charts, graphs, and system schematics, including commonly used lines, symbols, and terminology. |
| AM.I.B.K4 | Terms used in conjunction with aircraft drawings, blueprints, or system schematics. |
| AM.I.B.R4 | Identification of the current version and applicability of drawing being used. |
| AM.I.B.R1 | Interpretation of plus or minus tolerances as depicted on aircraft drawings. |
Which oral exam questions can I practice?
These practice questions are built from ACS elements; they are not actual FAA test questions. The short explanations are study answers, not complete aircraft maintenance procedures.
1. How does a detail drawing differ from an assembly drawing?
ACS: AM.I.B.K1
A detail drawing is a description of a single part; its lines, notes, and symbols specify the size, shape, material, and manufacturing methods. An assembly drawing is a description of an object made up of two or more parts. The assembly drawing shows the relationship of the various parts.
FAA-H-8083-30B, General, p. 4-2
2. What does an installation drawing tell you?
ACS: AM.I.B.K1
An installation drawing includes the information needed for a part or assembly in its final installed position in the aircraft. The drawing gives dimensions locating specific parts relative to other parts, along with reference dimensions helpful in later shop work.
FAA-H-8083-30B, General, p. 4-2
3. Why would you use a sectional view?
ACS: AM.I.B.K1
A sectional view shows the shape and construction at a cutting plane by cutting away part of the object. A full section is useful when exterior views cannot clearly show internal construction or hidden features. A half section can show both the interior and exterior of a symmetrical object.
FAA-H-8083-30B, General, p. 4-2
4. What information do you look for in a title block?
ACS: AM.I.B.K4
I look for the drawing number, part or assembly name, scale, date, firm name, and the names of the draftsman, checker, and person approving the drawing. The layout is not standard; the title block is usually in the lower right-hand corner, but it may extend across the bottom.
FAA-H-8083-30B, General, p. 4-3
5. How do you identify what changed on a drawing?
ACS: AM.I.B.R4
I check the revision block for the identification symbol, date, nature of the revision, authority for the change, and name of the draftsman who made it. The changes are lettered or numbered and listed against that symbol. To distinguish a corrected drawing from its previous version, many firms also include a space in the title block for the revision symbol. I also check the application shown near or in the title block, which may tie the drawing to a specific aircraft, assembly, sub-assembly, or unique application.
FAA-H-8083-30B, General, p. 4-8 · FAA-H-8083-30B, General, p. 4-9
6. Why should you use the written dimensions instead of measuring the print?
ACS: AM.I.B.K4
Computer displays and printers can enlarge or reduce a drawing, and even a nominal 1:1 copy may differ slightly from the original. For accurate information, refer to the dimensions shown on the drawing.
FAA-H-8083-30B, General, p. 4-9
7. A dimension is 0.225 plus 0.0025, minus 0.0005. What are the limits and total tolerance?
ACS: AM.I.B.R1
The allowable limits are 0.2245 and 0.2275. The total tolerance is 0.0030, the sum of the 0.0025 upper allowance and 0.0005 lower allowance. If the dimension were 0.225 plus or minus 0.0025 instead, the total tolerance would be 0.0050.
FAA-H-8083-30B, General, p. 4-9
8. Do orthographic drawings have to show all six views?
ACS: AM.I.B.K1
No. It is seldom necessary to show all six views. Six views are possible: front, top, bottom, rear, right side, and left side. Only the views needed to illustrate the required characteristics are drawn. One-, two-, and three-view drawings are the most common.
FAA-H-8083-30B, General, p. 4-9
9. What can a schematic tell you, and what does it leave out?
ACS: AM.I.B.K1
A schematic shows the principle of operation of an aircraft system and locates the components with respect to each other. Schematics are often used for troubleshooting and training. Schematics do not show the components' actual size, shape, or location in the aircraft. Installation diagrams identify components and show their location in the aircraft.
FAA-H-8083-30B, General, p. 4-11
10. How do centerlines and hidden lines differ?
ACS: AM.I.B.K1
Centerlines use alternate long and short dashes to indicate the center of an object or part. Hidden lines indicate invisible edges or contours and consist of short, evenly spaced dashes.
FAA-H-8083-30B, General, p. 4-16 · FAA-H-8083-30B, General, p. 4-18
How do I answer it out loud?
Sketch a simple part and label a visible edge, hidden edge, and centerline. Then explain the difference between a sectional view and an installation drawing. Finish by calculating the two limits in question 7 without looking at the answer.
How should I check my practice answer?
After speaking, compare your explanation with the answer and the cited FAA page. Check the reason, the conditions, and any limitation stated in the source. Repeat the question without looking until you can give a connected spoken answer.
Use references during study, then close them for the spoken rehearsal. The ACS states that reference material is not allowed for answering oral questions.
What else should I know?
When would I choose an assembly drawing rather than a detail drawing?
Choose an assembly drawing when you need to see how two or more parts relate to each other; that is its primary purpose. A detail drawing describes a single part: its size, shape, material, and methods of manufacture. An assembly drawing is often accompanied by detail drawings of the various parts.
FAA-H-8083-30B, General, p. 4-2
Can I measure a copied drawing to obtain an accurate dimension?
Not for accurate work. A drawing can be zoomed in or out on a computer, some printers can do the same, and even a 1:1 copy may differ slightly in size from the original. For accurate information, refer to the dimensions shown on the drawing.
FAA-H-8083-30B, General, p. 4-9
Is a plus-or-minus allowance the same as the total tolerance?
No. The plus figure is the maximum allowable variation and the minus figure is the minimum; the tolerance is the sum of the two. For 0.225 plus 0.0025, minus 0.0005, the tolerance is 0.0030. When the allowances are equal, as in 0.225 plus or minus 0.0025, the tolerance is 0.0050.
FAA-H-8083-30B, General, p. 4-9
Does a schematic show where a component is installed?
No. A schematic locates components with respect to each other within the system, but it does not indicate where they are in the aircraft or show their actual size and shape. An installation diagram identifies each component and shows its location in the aircraft.
How can I rehearse the spoken answer?
DMEReady is an AI voice examiner for the A&P oral in your phone or computer browser. You answer out loud, and it asks follow-up questions the way a DME would. After each session, the report shows what you covered, what you missed, what a complete answer includes, and where to read in the FAA handbooks. You can save the report as a PDF study sheet and share a result image that never shows your answers or name. The first drill is free, with no sign-up. DMEReady is an AI examiner, not a human DME. It is independent and is not affiliated with or endorsed by the FAA; it does not predict or guarantee results.
Start your free drillWhich guide should I read next?
- Aircraft Hardware and Materials Oral Exam Questions
- Inspection Concepts and Techniques Oral Exam Questions
Which sources support these answers?
References show the printed pages. Links open the corresponding PDF pages.
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