Airframe 3

Heat from refrigerant vapor is taken into?. Evaporator. Compressor. Condenser.

Purpose of flapper-type check valves in integral tanks?. Prevent fuel from flowing away from booster pumps. Increase fuel temperature. Reduce fuel pressure.

Flapper valves act as?. Pressure regulators. Check valves. Fuel selectors.

Why place propeller in low pitch for takeoff?. Reduce RPM. Maximum horsepower. Reduce drag only.

How to remove dent from steel propeller edge?. Heat and reshape. File smooth and polish. Replace blade.

How to track a wooden blade if out of track? A. Add weight to tips B. Shorten one blade C. Respuesta: C. Add weight to tips. Shorten one blade. Place shims at rear of hub.

Stop constant speed prop in high pitch in cold weather because?. Prevent oil congealing. Reduce RPM. Increase thrust.

How is wooden prop balanced?. Install balancing weights internally. Apply solder to tipping. Add oil to hub.

Final balancing of metal propeller? A. Insert lead wool in concentric holes B. Add solder weights C. Adjust pitch Respuesta: A. Insert lead wool in concentric holes. Add solder weights. Adjust pitch.

Aircraft with clockwise-turning prop will roll which way?. Right. Left (counterclockwise). Neutral.

Bonding of aircraft purpose?. Add strength to airframe. Eliminate sparks from static electricity. Reduce corrosion.

Damaged control cables should be?. Shortened. Replaced. Filed smooth.

Hand sewing baseball stitch spacing?. 2 stitches per inch. Minimum 4 stitches per inch. 6 stitches per inch.

Rib stitching for aircraft <150 mph?. 1 inch slipstream, 2 inch outside. 2.5 in slipstream, 3.5 in outside. 4 in slipstream only.

Edge of fabric patch must?. Be glued only. Be pinked or frayed ~1/4 inch. Be metal reinforced.

Maximum allowable fabric deterioration?. 10%. 50%. 30%.

Minimum rivet edge distance?. 1 × diameter. 2 × diameter. 3 × diameter.

Rivet length for joining 0.032 and 0.064 in?. 1/4 inch. 5/16 inch. 3/8 inch.

Anodizing is?. Chemical paint removal. Electro-chemical formation of oxide layer. Heat treating metal.

Bend lines should?. Be parallel to grain. Be 90° to grain. Follow rivet pattern.

Rivet holes drilled oversize by?. 0.001 inch. 0.003 inch. 0.010 inch.

Formed head of rivet goes on?. Thick sheet. Thin sheet. Middle of joint.

Rivet shank length? A. Combined thickness + 1.5 × diameter B. Combined thickness + 0.5 × diameter C. Combined thickness only Respuesta: A. Combined thickness + 1.5 × diameter. Combined thickness + 0.5 × diameter. Combined thickness only.

Fiber lock nuts must have?. No threads showing. At least one full thread showing. Two threads above nut.

Cable size selection based on?. Voltage only. Current capacity and voltage drop. Wire color.

Formula E = I × R relates to?. Newton’s law. Bernoulli’s principle. Ohm’s law.

Bonding surfaces finish removed to assure?. High voltage. Low resistance connection. Surface cooling.

Faulty electrical instruments should be?. Repaired by mechanic on site. Sent to approved repair shop. Taped and reused.

Junction boxes mounted open side down because?. For easier maintenance. Loose metal can fall out. To increase airflow.

Safety belts must withstand?. 500 lbs. 1,000 lbs. 2,000 lbs.

Thread tensile strength for hand sewing?. 10 lbs. 14 lbs. 20 lbs.

Fire extinguisher color code?. Green. Brown. Blue.

Maximum terminal lugs per stud?. 2. 3. 4.

Tensiometers have?. Riser specified for cable size. Only one universal riser. No adjustment.

How to restore generator field residual magnetism?. Replace generator. Flash the fields. Increase RPM.