Airframe Flashcards
How do you determine the total length of a solid rivet for installation?
The grip length +1.5 X the rivet diameter
Give examples self plugging, mechanical lock rivets
- Cherrylock
- Cherrymax
- Hulklock
- Olympiclock
- CherrySST
What is done with the rivet head stem when a self plugging rivet is install installed?
The stem is pulled until it snaps off, and any remaining projecting part is trimmed flush with the head
What power sources are normally used to retract landing gear systems?
Hydraulic or electrical
What methods are used in forming sheet metal?
- Shrinking.
- Stretching
- Bumping
- Crimping
- Folding
What factors are used to determine setback?
Bend radius and material thickness
What calculation must be made when bending sheet metal?
Bend allowance and setback
What must be done when two bands intersect to prevent cracking?
Relief holes are drilled at the intersection or corner
What is a joggle?
An offset formed on a part to allow clearance for a sheet or another mating part
What is the purpose of lightning holes cut in rib sections?
To reduce weight and increase off stiffness
Describe rivet head markings for A, B, D, AD and DD rivets
A rivets – plain, no marks
B rivets – have a cross
D rivets – have a raised dot
AD rivets – have a dimple
DD rivets – have a double dash
What are the correct dimensions on a properly formed rivet head?
Shop head should have a diameter of one and 1 1/2 times the original rivet diameter and its depth should at least be 1/2 the rivet diameter
How do you determine the proper material to be used for a repair on an all metal aircraft?
Use the same type and thickness of material that was used in the original structure
What is the single row spacing and edge distance for protruding head rivets?
Edge is 2 times the diameter
Spacing is 3 times the diameter
Describe the criteria for replacement of a 2024 rivet with a 2117 rivet for general repairs
For 2024 rivets 5/32 or less diameter use the next larger size 2117 rivet using the minimum requirements for edge and spacing distance
What is the major type of damage to aluminum structures that is caused by exposure to weather?
Corrosion
What is the difference between the tools required to pull a cherry lock rivet and a cherry max rivet?
Cherry lock – require a different tool for each rivet size
Cherry max – same tool for all
How can a mechanic determine whether the counter sink for a flush rivet should be dimple or drilled?
By the thickness of the top sheet, thin sheets are dimple and thick sheets may be countersunk
What action is taken to prevent cracks from forming while dimpling, magnesium or some hard sheet metals?
Hot dimpling equipment is used to preheat and soften the metal before the dimple is formed
What type of damage can occur when using a rivet set that does not properly fit the rivet?
The rivet head and the sheet metal may be damaged
Why is it important to use the proper bucking bar when performing sheet metal riveting?
Bucking bar, too large or heavy— difficult to control and you can damage the sheet metal
Bucking bar too light — Will not properly set the rivet before work Hardening occur.
What procedures should be followed to properly remove a solid shank rivet?
Center punched the rivet and drilled to the base of the rivet head using the same size or one size smaller drill, then use a pin punch to break off the rivet head
Which of the five stresses is the most common cause of rivet failure?
Shear
In accordance with 14 CFR 65.85 and 65.87 what type of inspection may a certified airframe and power plant mechanic sign off?
100 hour inspection
When may a mechanic perform an annual inspection?
When they hold an A& P certificate with an inspection authorization (IA)
When must an annual inspection be performed if required for a particular aircraft?
Within 12 calendar months of the preceding inspection
Where is a list of information that is required for aircraft records after competition of 100 hour inspections?
FAR part 43
Where would you find the operating conditions that make a 100 hour inspection mandatory?
FAR part 91
Where would you find the recommended statement for recording the approval or disapproval for return to service of an aircraft after a 100 hour or an annual inspection?
FAR part 43
Who may supervise a progressive inspection?
An A&P mechanic with an inspection authorization
A certified repair station
The aircraft manufacturer
When is a 100 hour inspection required on an aircraft operating under part 91 (general operating and flight rules)?
When the aircraft is used to carry persons for hire
When the aircraft is used for flight instruction for hire
When is the first 100 hour inspection due after discontinuance of a progressive inspection program?
100 hours after the last complete inspection of the progressive program
Does an aircraft under the progressive inspection program need a 100 hour inspection if it is used for flight insurance for hire?
NO. Progressive inspections replace 100 hour inspections
What is the purpose of the rotorcraft collective pitch control?
It varies the lift of the main rotor blades simultaneously
What unit compensates for helicopter main rotor torque?
The tail rotor
What controls a helicopter tail rotor?
Foot pedals
Where does the breakage of control cables occur most frequently?
Were cables pass over pulleys or pass through fairleads
What is a cable fairlead?
A cable guide that prevent the cable from rubbing on the aircraft structure
What are cable tension regulators?
Mechanical devices that automatically maintain cable tension to compensate for expansion and contraction of the aircraft structure
What tools are primarily used to check control surface travel?
Protractors
Rigging fixtures
Contour templates and rules
What items must be known before using a typical cable rigging chart?
Cable size and ambient temperature
Why should control surfaces be locked when an aircraft is parked?
To prevent damage from the wind
Describe some of the tools used to check control surface travel
A universal propeller, protractor or special control surface protractor
If the owner or operator of an aircraft desires to use a progressive inspection program, who must they submit a written request to?
FAA FSDO having jurisdiction over the area in which the applicant is located
What kind of certificate must an individual have to conduct a complete 100 hour inspection on an aircraft and approve it for return to service?
FAA mechanical certificate with air frame, and power plant ratings
Who must approve for return to service radio equipment installations made in accordance with supplemental type certificate data?
An A&P mechanic with an inspection authorization
Can an aircraft that is required by section 91.409 to have a 100 hour inspection be flown beyond the inspection requirement?
YES. As necessary to reach a place at which the inspection can be done, but not to exceed 10 flight hours
How do you determine when the next 100 hour inspection is due if the owner while en route to a maintenance facility exceeded the 100 hour inspection by two hours?
The two hours must be included in computing the next 100 hours of time in service
What is the purpose of landing gear, torque links?
They keep the landing gear pointed in a straight direction
What is used to inflate a landing gear shock strut?
Dry air or nitrogen
