AFAB 115 MIDTERM EXAM QUESTIONS
WITH 100% CORRECT ANSWERS
What ensures a perpendicular drill? - Answer-An egg cup or drill block
How do you minimize fatigue and enable fasteners to sit properly? - Answer-Properly
perform deburring, chamfering, and edge breaks
What do you do to prevent delamination and breakout when drilling composites? -
Answer-support the material from the backside
What do you do to minimize delamination when drilling in graphite/ carbon or
composites? - Answer-always keep the drill rotating as it touches the surface and during
withdrawal
What must be protected when drilling by the use of drill stops? - Answer-Wire bundles
and hydraulic lines
What are the components of a two part sealant? - Answer-The base compound and the
accelerator
True or False: After fay surface sealant is applied, the two surfaces are joined to attain
100% extrusion, or squeeze out of the faying surface sealant. - Answer-True
How do you achieve a good sealant bond? - Answer-ensure the substrate is abraded,
cleaned, and protected against contamination
How long can a cleaned sealed surface remain unsealed? - Answer-24 hrs
What must be eliminated while sealing? - Answer-Sources of potential contamination in
sealing like personnel, equipment, moisture condensation
Should the Adhesion promoter be kept in closed containers at all times? - Answer-Yes,
to limit it's exposure to moisture
What happens if sealant is not applied over adhesion promoter within 4 hours? -
Answer-The surface must be retreated
What are sealants affected by? - Answer-Temperature and relative humidity
When mixing, can you interchange curing agents from different batches of seal? -
Answer-No
, What does the capability of an aircraft to withstand aerodynamic loads depend on? -
Answer-The strength of thousands of fasteners
What does the strength of aircraft fasteners depend on? - Answer-The technician who
drills and prepares the holes in which the fasteners are installed
What is an important responsibility of a technician? - Answer-Identifying and applying
specifications within acceptable tolerance
What is fundamental for good joint performance and durability? - Answer-Clean, round
holes within tolerance and with minimal burrs
What minimizes cracks in drilled material? - Answer-Accurate hole drilling
Why must holes be accurately drilled? - Answer-As holes are added to the aircraft
structure, they can weaken the structure in which they are drilled
What is one of the technicians most critical and important jobs? - Answer-Hole
generation
What is the single largest number of defects or errors in aircraft manufacturing
associated with? - Answer-Hole generation, or more accurately the generation of
inaccurate holes
What do DOD manufacturers have to be in order to generate holes? - Answer-They
must be certified by the manufacturer/employer to perform hole drilling operations
Who does the ultimate responsibility for accurate hole generation rest on? - Answer-The
individual technician performing the work
What must a technician do when drilling holes? - Answer-Prevent all possible defects
when generating holes
Ensure product quality and cost efficiency
What is tolerance? - Answer-the plus or minus allowances in hole dimensions
What is the only angle accurate holes can be drilled at? - Answer-90 degrees
What do you use to check hole diameters and dimensions? - Answer-A ball gauge or
micrometer
How are rivets identified? - Answer-By rivet part numbers
WITH 100% CORRECT ANSWERS
What ensures a perpendicular drill? - Answer-An egg cup or drill block
How do you minimize fatigue and enable fasteners to sit properly? - Answer-Properly
perform deburring, chamfering, and edge breaks
What do you do to prevent delamination and breakout when drilling composites? -
Answer-support the material from the backside
What do you do to minimize delamination when drilling in graphite/ carbon or
composites? - Answer-always keep the drill rotating as it touches the surface and during
withdrawal
What must be protected when drilling by the use of drill stops? - Answer-Wire bundles
and hydraulic lines
What are the components of a two part sealant? - Answer-The base compound and the
accelerator
True or False: After fay surface sealant is applied, the two surfaces are joined to attain
100% extrusion, or squeeze out of the faying surface sealant. - Answer-True
How do you achieve a good sealant bond? - Answer-ensure the substrate is abraded,
cleaned, and protected against contamination
How long can a cleaned sealed surface remain unsealed? - Answer-24 hrs
What must be eliminated while sealing? - Answer-Sources of potential contamination in
sealing like personnel, equipment, moisture condensation
Should the Adhesion promoter be kept in closed containers at all times? - Answer-Yes,
to limit it's exposure to moisture
What happens if sealant is not applied over adhesion promoter within 4 hours? -
Answer-The surface must be retreated
What are sealants affected by? - Answer-Temperature and relative humidity
When mixing, can you interchange curing agents from different batches of seal? -
Answer-No
, What does the capability of an aircraft to withstand aerodynamic loads depend on? -
Answer-The strength of thousands of fasteners
What does the strength of aircraft fasteners depend on? - Answer-The technician who
drills and prepares the holes in which the fasteners are installed
What is an important responsibility of a technician? - Answer-Identifying and applying
specifications within acceptable tolerance
What is fundamental for good joint performance and durability? - Answer-Clean, round
holes within tolerance and with minimal burrs
What minimizes cracks in drilled material? - Answer-Accurate hole drilling
Why must holes be accurately drilled? - Answer-As holes are added to the aircraft
structure, they can weaken the structure in which they are drilled
What is one of the technicians most critical and important jobs? - Answer-Hole
generation
What is the single largest number of defects or errors in aircraft manufacturing
associated with? - Answer-Hole generation, or more accurately the generation of
inaccurate holes
What do DOD manufacturers have to be in order to generate holes? - Answer-They
must be certified by the manufacturer/employer to perform hole drilling operations
Who does the ultimate responsibility for accurate hole generation rest on? - Answer-The
individual technician performing the work
What must a technician do when drilling holes? - Answer-Prevent all possible defects
when generating holes
Ensure product quality and cost efficiency
What is tolerance? - Answer-the plus or minus allowances in hole dimensions
What is the only angle accurate holes can be drilled at? - Answer-90 degrees
What do you use to check hole diameters and dimensions? - Answer-A ball gauge or
micrometer
How are rivets identified? - Answer-By rivet part numbers
