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17 Cards in this Set

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Unless otherwise specified, torque values for tightening aircraft nuts and bolts relate to

Clean, dry threads.

Unless the table torque values for a specific fasteners specified otherwise, the torque values given are for clean, dry threads.

Unless otherwise specified or required aircraft bolts should be installed so that the bolt head is

Upward, or in a forward direction.

Bolts should always be placed in the direction specified by the aircraft or engine manufacturer. However, in the absence of specific instructions, bolt heads should be installed upward or in a forward direction. This helps prevent the bolt from slipping out if the nut comes off.

A fiber type self locking nut must never be used on an aircraft if the bolt is

Subject to rotation

Self locking nuts are used on aircraft to provide tight connections which will not shake loose under severe vibration. However, fiber types of locking nuts will not remain secure at joints which are subject to rotation.

Aircraft bolts with a cross or asterisk marked on the bolt head are

Standard steel bolts

AN standard steel bolts are identified by a cross or an asterisk on the head. An aluminum alloy bolt it is identified by two dashes on opposite sides of the bolt head and close tolerance bolts are identified by an X inside a triangle.

Which statement regarding aircraft bolts is correct?

1. Alloy bolts smaller than 1/4 inch diameter should be used in primary structure.

2. When tightening castellated nuts on the bolts, if the cotter pin holes do not line up, it is permissible to tighten the nut up to 10% over recommended torque to prevent alignment of the next lot with the cotter pin hole.

3. In general, bolt grip length should equal the material thickness.

In general, bolt grip length should equal the material thickness.

The grip length is the length of the unthreaded portion of the bolt shank. Generally the grip length should be equal to the thickness of the material being bolted together. However, bolts of slightly greater grip length may be used in washers are placed under the nut or the bolt head.

Generally speaking, bolt grip lengths should be

Equal to the thickness of the material which is fastened together

The grip length is the length of the on threaded portion of the bolt sank. Generally the grip length should be equal to the thickness of the material being bolted together. However, bolts of slightly greater grip length may be used if washers are placed under the nut or the bolthead.

When the specific torque value for nuts is not given, where can the recommended torque value be found?

AC 43.13-1B

Standard torque tables are used as a guide and tightening nuts, studs, bolt, and screws whenever specific torque values are not called out in the maintenance procedures. These tables are found in AC 43.13 - 1B.

A particular component is attached to the aircraft structure by the use of an aircraft bolt and a castellated tension combination. If the cotter pin hole does not align within the recommended torque range, the acceptable practice is to

Change washers and try again

When cotter pin holes don't line up with a nut castellation at the proper torque, you should vary that number of washers and try again. It is not acceptable to exceed a specified torque value

A bolt with a single raised dash on the head is classified as an

AN corrosion resistant steel bolt

A single raise dash on the head of a bolt identifies an an corrosion-resistant standard steel bolts

How is a clevis bolt used in a fork end cable terminal secured?

With a shear nut tightened to a snug fit, but with no strain imposed on the fork and safetied with a cotter pin

Because a clevis bolt is used only on shear loads, a shear nut is used, and is tightened only to a snug fit and secured with a cotter pin. once installed there should be no strain imposed on the fork.

Where is an AN clevis bolt used in an airplane?

Only for shear load applications

A clevis bolt is used only where shear loads occur and never under tension loads. Clevis bolts are commonly used to attach a cable to a control horn.

A boat with an X inside the triangle on the head is classified as a

NAS close tolerance bolt

NAS close tolerance bolts are classified are machined more accurately than a general-purpose boat. They are used in applications were a drive it is required, and can be identified by an X inside a triangle on the head.

Aircraft bolts are usually manufactured with a

Class 3 fit for the threads

The class of a thread indicates a tolerance allowed in manufacturing. Class 1 is a loose fit, class 2 is a free fit, class 3 is a medium fit, and a class 4 is the closest fit. Aircraft bolts are almost always manufactured to a class 3 fit.

How is the locking feature of the fiber-type locknut obtained?

By the use of an unthreaded fiber locking insert

A fiber type lock nut is a standard not with a fiber locking collar. This color is not threaded and its inside diameter is smaller than the outside diameter of the threaded portion.

(Refer to Figure 42)

Which of the bolt head cold markings shown identifies a corrosion resistant AN standard steel bolt?


Corrosion-resistant am standard steel bolt is indicated by a single dash on the head. The raised cross indicates and AN standard steel bolt while a triangle with an X in it indicates a close tolerance bolt

(Refer to Figure 43)

identify the clevis bolt illustrated


The clevis bolt resembles a screw in that the head of a bolt is either slotted to receive a common screwdriver or recessed to receive a crosspoint screwdriver. Clevis boats are used only ensure applications, such as connecting a control cable to control horn.

Which maintenance record entry best describes the action taken for a control cable showing approximately 20% where on several of the individual outer wires at a fairlead?

Wear within acceptable limits, repair not necessary

You should replace flexible and non flexible cables when the individual wires in each strand appear to blend together or when the outer wire are worn 40 to 50%. In this example, the word is within acceptable limits and no repair is necessary.