General Oral Questions

How many views can there be on an orthographic projection?

Six.

How many views are used to show most objects in an aircraft drawing?

Three.

What information is given in the title block of an aircraft drawing?

The name and address of the company that made the part, the name of the part, the scale of the drawing, the name of the draftsman, the name of the engineer approving the part, and the number of the part (drawing number).

Where is the title block normally located on an aircraft drawing?

In the lower right-hand corner of the drawing.

How can you know that the aircraft drawing you are using is the most current version of the drawing?

By the number in the revision block and the log of the most recent drawings.

What is a detailed drawing?

A drawing that includes all the information needed to fabricate the part.

What is an assembly drawing?

A drawing that shows all the components of a part in an exploded form. A parts list is included with an assembly drawing.

What is an installation drawing?

A drawing that shows the location of the part and assemblies on the complete aircraft.

What is a block diagram?

A drawing that shows the various functions of a system by a series of blocks. These blocks do not include any detail, but instead indicate what happens in each block.

How are dimensions shown on an aircraft drawing?

By numbers shown in the break of a dimension line.

What is the purpose of a center line on an aircraft drawing?

It divides a part into symmetrical halves.

Of what material are most low-pressure rigid fluid lines made?

1100-1/2 hard or 3003-1/2 hard aluminum alloy tubing.

Is the size of a rigid fluid line determined by its inside or its outside diameter?

By its outside diameter.

What is the difference between the flare angle for aircraft and automotive fittings?

Aircraft fittings have a 37-degree flare angle, and automotive fittings use 45 degrees.

Where are quick-disconnect fluid line couplings normally used in an aircraft hydraulic system?

In the lines that connect the engine-driven pump to the hydraulic system.

Is the size of a flexible hose determined by its inside or outside diameter?

By its inside diameter.

Where is filiform corrosion most likely to occur on an aircraft?

Under a dense coating of topcoat enamel, such as polyurethane. Filiform corrosion is cause by improperly cured primer.

Where is fretting corrosion most likely to occur on an aircraft?

In a location where there is a slight amount of relative motion between two components and no way for corrosive residue to be removed as it forms.

Where is intergranular corrosion most likely to occur on an aircraft?

Along the grain boundaries of aluminum alloys that have been improperly heat-treated. Extruding aluminum alloy is susceptible to intergranular corrosion.

Where is stress corrosion most likely to occur on on aircraft?

In any metal component that is continually under tensile stress. The metal around holes in castings fitted with pressed-in bushings is susceptible to stress corrosion.

What causes fisheyes in the finish?

Localized surface contamination.

Which part of the CFR covers certification of mechanics?

14 CFR Part 65.

Where does an aircraft mechanic find FAA-approved maintenance data, including maintenance manuals or other methods, techniques, and practices acceptable to the Administrator?

In the aircraft manufacturer’s maintenance manual and Instructions for Continued Airworthiness, and in advisory circulars (AC 43.13-1, AC 43.13-2).

Which part of the CFR covers general operating and flight rules?

14 CFR Part 91.

What CFR part contains maintenance, preventive maintenance, rebuilding, and alteration regulations?

14 CFR Part 43.

What part covers repair stations?

14 CFR Part 145.

What part covers air carrier operations?

14 CFR Part 121.

What part applies to airworthiness standards for normal category airplanes?

14 CFR Part 23.

Which part covers Identification and Registration Marking of aircraft?

14 CFR Part 45.

Which part covers on-demand/charter operations?

14 CFR Part 135.

Which part covers aviation maintenance technician schools?

14 CFR Part 147.

What does 14 CFR 43 Appendix A cover?

Major repairs and alterations/preventative maintenance.

What does 14 CFR 43 Appendix B cover?

Recording of major repairs/alterations.