Hardware Flashcards

Question

Aircraft bolts are usually Class 3

Answer 1

while aircraft screws are usually Class 2

Answer 2

indicates 2024 aluminum

Answer 3

hole is drilled for safetying

Answer 4

no hole is drilled

Answer 5

corrosion resistant steel

Answer 6

Corrosion resistant steel and brass Lower prong not to contact washer, upper prong not to extend past the bolt diameter

Answer 7

non-threaded fastener used to secure two components together, often creating a hinge joint where components need to pivot or rotate. It features a head on one end and a cross-hole or groove at the other, with a cotter pin, R-clip, or retaining ring inserted through the hole to secure the pin in place.

Answer 8

The Camloc fastener is used to secure aircraft cowlings and fairings. It consists of three parts: a stud assembly, a grommet, and a receptacle. Two types of receptacles are available: rigid and floating. The stud and grommet are installed in the removable portion; the receptacle is riveted to the structure of the aircraft. The stud and grommet are installed in either a plain, dimpled, countersunk, or counter bored hole, depending upon the location and thickness of the material involved.

Answer 9

Plain and threaded taper pins (AN385 and AN386) are used in joints that carry shear loads and where absence of play is essential. The plain taper pin is drilled and usually safetied with wire. The threaded taper pin is used with a taper pin washer (AN975) and shear nut (safetied with a cotter pin or safety clip) or self-locking nut

Answer 10

Stainless steel (most common) Brass (shear wire) Copper (shear wire) Common diameters include .020, .032, .040 Single wire method can only be used on small screws in closely spaced geometrical patterns When using the double twist method: Max of 3 HW in widely spaced area Or, for closely spaced HW the max number is the amount hat can be safetied with a 24 inch length of wire 6-8 twist per inch

Answer 11

Wire x Strand each wire

Answer 12

Class 1 is a loose fit Class 2 is a free fit Class 3 is a medium fit Class 4 is a close fit

Answer 13

Pitch: Larger pitch, meaning fewer threads per inch (TPI) for the same diameter. Advantages: Faster assembly: The larger pitch allows for quicker installation. Less prone to galling: There's a lower chance of the threads seizing during assembly. Accepts imperfections: More tolerant of slight flaws in the threads. Higher strength: Can handle larger tensile and shear forces due to the larger tooth size. Common Uses: General-purpose applications, machinery, equipment, and structural components

Answer 14

Pitch: Smaller pitch, meaning more threads per inch (TPI) for the same diameter. Advantages: Better for fine adjustments: The smaller pitch allows for more precise adjustments. Resists loosening: The smaller helix angle provides better self-locking and prevents loosening from vibration. Stronger in tension: Generally offers higher tensile and shear strength than coarse threads. Better sealing: The smaller pitch can reduce fluid leakage. Common Uses: Thin-walled materials, sheet metal, high-vibration environments, and applications requiring precise control or sealing.

Answer 15

used in the interior of the aircraft, except where clearance is required for adjacent members

Answer 16

like the roundhead rivet, is used on interior structures. It is used where maximum strength is needed and where there isn't sufficient clearance to use a roundhead rivet. It is seldom, if ever, used on external surfaces. The brazier head rivet has a head of large diameter, which makes it particularly adaptable for riveting thin sheet stock (skin). The brazier head rivet offers only slight resistance to the airflow, and because of this factor, it is frequently used for riveting skin on exterior surfaces, especially on aft sections of the fuselage and empennage. It is used for riveting thin sheets exposed to the slipstream. A modified brazier head rivet is also manufactured; it is simply a brazier head of reduced diameter.

Answer 17

combination of the roundhead, flathead, and brazier head. It is used in aircraft construction and repair in both interior and exterior locations. When replacement is necessary for protruding head rivets - roundhead, flathead, or brazier head - they can be replaced by universal head rivets.

Answer 18

Bolts designed for a particular application or use is classified as special-purpose bolts. Clevis bolts, eyebolts, Jo-bolts, and lockbolts are special-purpose bolts

Answer 19

The head of a Clevis bolt is round and is either slotted to receive a common screwdriver or recessed to receive a cross point screwdriver. This type of bolt is used only where shear loads occur and never in tension. It is often inserted as a mechanical pin in a control system

Answer 20

The eyebolt is a special-purpose bolt used where external tension loads are to be applied. The eyebolt is designed for the attachment of devices, such as the fork of a turnbuckle, a Clevis, or a cable shackle. The threaded end may or may not be drilled for safetying

Hardware Flashcards

(44 cards)