A.M_MAJOR EXAM.3

During starting of a turbine powerplant using a compressed air starter, a hung start occurred. Select the proper procedure.

• Advance power lever to increase RPM.
• Re-engage the starter.
• Shut the engine down.

Which statement below reflects a typical require- ment when towing some aircraft?

• Discharge all hydraulic pressure to prevent accidental operation of the nosewheel steering mechanism.
• Tailwheel aircraft must be towed backwards.
• If the aircraft has a steerable nosewheel, the torque-link lock should be set to full swivel.

A hung start in a jet engine is often caused by

• malfunctions in the ignition system.
• the starter cutting off too soon.
• an excessively rich fuel/air mixture.

Which coupling nut should be selected for use with 1/2-inch aluminum oil lines which are to be assembled using flared tube ends and standard AN nuts, sleeves, and fittings?

• AN-818-5.
• AN-818-16.
• AN-818-8.

Metal tubing fluid lines are sized by wall thickness and

• outside diameter in 1/16 inch increments.
• inside diameter in 1/16 inch increments.
• outside diameter in 1/32 inch increments.

Rolling-type Flaring Tools are used to flare __________, __________, and ___________ tubing.

• Stainless steel, hard copper, mild steel.
• Titanium, soft copper, corrosion resistant steel.
• Soft copper, aluminum, brass.

From the following sequences of steps, indicate the proper order you would use to make a single flare on a piece of tubing: 1. Place the tube in the proper size hole in the flaring block. 2. Project the end of the tube slightly from the top of the flaring tool, about the thickness of a dime. 3. Slip the fitting nut and sleeve on the tube. 4. Strike the plunger several light blows with a lightweight hammer or mallet and turn the plunger one-half turn after each blow. 5. Tighten the clamp bar securely to prevent slippage. 6. Center the plunger or flaring pin over the tube.

• 1, 3, 5, 2, 4, 6.
• 3, 1, 6, 2, 5, 4.
• 3, 1, 2, 6, 5, 4.

Hydraulic tubing, which is damaged in a localized area to such an extent that repair is necessary, may be repaired

• by cutting out the damaged area and utilizing a swaged tube fitting to join the tube ends.
• only by replacing the tubing section run (connection to connection) using the same size and material as the original.
• by cutting out the damaged section and soldering in a replacement section of tubing.

Of the following, when and/or where is galvanic corrosion is most likely to occur?

• When an electrolyte (water) covers the surface of an aluminum skin, seeps into the cracks between lap joints, and oxygen is excluded from the area.
• At the interface of a steel fastener and aluminum alloy inspection plate in the presence of an electrolyte.
• In an area of unprotected metal exposed to an atmosphere containing battery fumes, exhaust gases, or industrial contaminants.

One way of obtaining increased resistance to stress corrosion cracking is by

• relieving compressive stresses (via heat treatment) on the metal surface.
• creating compressive stresses (via shot peening) on the metal surface.
• producing nonuniform deformation while cold working during the manufacturing process.