AME Maintenance Practices and Materials 2

Question 1

Per AC 43.13-1B, what is the minimum diameter of safety wire for general-purpose safetying?

Accepted Answer

0.032 inch

Answer

0.032-inch wire is the minimum for general use; 0.020-inch is allowed only for small, closely spaced parts and special cases.

Question 2

Safety wire must be installed so that any tension on the wire tends to:

Accepted Answer

Tighten the fastener

Answer

The wire must pull in the tightening direction so the fastener cannot back off.

Question 3

After tightening a castellated nut to minimum torque, the cotter pin holes do not line up. What is the correct action?

Accepted Answer

Tighten further, staying within the specified torque range, until they align

Answer

Tighten further within the allowed torque range to align the slot; never back the nut off to align it.

Question 4

Fiber-insert (non-metallic) self-locking nuts should not be used where temperatures exceed approximately:

Accepted Answer

250°F

Answer

Fiber inserts lose their locking ability above about 250°F, so all-metal locknuts are used in hotter areas.

Question 5

Which aluminum rivet must be refrigerated after heat treatment to delay age hardening before it is driven?

Accepted Answer

2024-T4 (DD)

Answer

2024 'icebox' rivets age-harden at room temperature and must be kept cold to stay soft enough to drive.

AME - Aircraft Maintenance Engineer Practice Test