Airframe 10 (HDY & MLG)

What does the red dot on the sidewall of a tire align with?. he scuff guard. Valve stem or yellow dot on the tire tube. The tire registration mark.

To reduce tire heat buildup, you should…. Use low‑friction brakes only. Short rollouts, minimal braking, proper tire inflation. Always taxi at high speed.

How should tires be stored?. Horizontally, wrapped in plastic. Vertically in a cool, dry, dark location. Hung by the valve stem.

How long after landing should tire pressure be checked?. 1 hour. 3 hours. 6 hours.

What protects tires during installation?. Bootstraps. Chaffers. Scuff guards.

When a fuse is blown on a rim, can the tire be reused?. Yes, after inspection. No, it needs to be scrapped. Yes, if the rim is repaired.

What type of tire is used for landing speeds under 160 MPH?. Bias-ply tire. Radial tire. Low-speed rating tubeless tire.

What is likely to cause sluggish or jerky brakes on a multi-disc braking system?. Overcharged accumulator. The automatic adjuster needs cleaning. Too much brake fluid volume.

At what speed is the brake pressure deactivated on anti-skid brake systems?. 5–10 MPH. 15–20 MPH. 25–30 MPH.

What happens when, on landing, one of the wheels hits a patch of ice and stops turning?. Brake pressure increases to that wheel. The pressure is released to prevent skidding. The compensating port closes.

What does a de‑booster valve do?. Increases brake system pressure. Reduces pressure and provides quick application and relief of braking pressure. Prevents brake fluid from overheating.

What happens when the master cylinder has an internal leak?. Brakes apply too harshly. Brakes fade or feel spongy. Brake fluid foams.

What would be the result if brake clearances were set too close?. The brakes would drag, causing excessive wear and overheating. The brakes would not generate enough braking force. Brake fluid would constantly overflow.

Which braking system uses a high volume of fluid and an indicator master cylinder (power control valve)?. Hydraulic hand‑brake system. Power brake system. Pneumatic brake system.

What does the compensating port do in brake systems?. Allows excess fluid to return to reservoir to prevent over-braking. Feeds additional fluid to the brake during high-speed application. Balances pressure between left and right brakes only.

What is used to increase braking power on large aircraft?. Shuttle valve. Power brake control valve. Torque link.

What causes brakes to feel like they are grabbing or jerky?. Hydraulic fuses in the brake lines. Oil contamination, out‑of‑round brake drums, or warped discs. Low accumulator pressure.

What absorbs the initial shock on landing with an air/oil strut?. A spring in the lower chamber. Oiling moving from the lower chamber to the upper chamber through a metering valve. A nitrogen-charged bladder only.

What keeps the oleo on small aircraft in the center position and prevents it from turning?. Steering damper. Scissor or torque links. Centrifugal lock.

What centers the gear when it retracts?. Torquing crank. Centering cam. Shuttle valve.

Landing gear doors open before the landing gear retracts by means of a…?. Pressure regulator. Sequence valve. Accumulator.

How do you check the level and pressure when servicing an oleo strut?. Partially extend the strut and use a feeler gauge. Fully extend and compress the strut to fill it with fluid; the pressure is indicated by the length of its extension. Use a pressure gauge only when the strut is fully compressed.

What does a shimmy damper do and how does it work?. It reduces side-to-side oscillations of the nose wheel by relying on a dashpot mechanism to damp out unwanted motion. It increases hydraulic pressure to extend the gear faster. It prevents the wheels from locking on landing by modulating brake pressure.

What causes the landing gear not to fully retract?. Air in the hydraulic lines. Low fluid level. Faulty scissor links.

What directs the flow of fluid?. Relief valve. Shuttle valve. Selector valve.

What type of seal is used with phosphate ester-based fluids?. Nitrile rubber. Butyl rubber. Fluorosilicone.

What is the thermal relief valve setting?. The lowest pressure the system can go under normal operation. A mid-range pressure setting for normal hydraulic loads. The highest setting in the system to relieve over-pressure due to temperature increases.

What is the purpose of an accumulator?. To store energy by holding fluid under pressure for shock absorption, peak demand, or emergency use. To act as a flow restrictor during flap operation. To vent excess hydraulic fluid overboard.

What does a shuttle valve provide?. A bypass for fluid filtration. A means of disconnecting from the main hydraulic system to connect to an emergency system. A route for excess fluid to return to the reservoir.

What is a wing‑flap relief valve?. A valve that prevents flap over-extension under load. A relief valve designed to open when the flaps are lowered at too high an airspeed. A valve that helps return flaps to neutral.

What is the function of a check valve?. Regulates pressure up to a safe limit. Ensures fluid moves only in one direction. Stores fluid under pressure for emergency use.

What do snubbers do?. Filter hydraulic fluid. Hydraulically slow down or cushion the movement of soft controls. Increase system pressure during landing gear retraction.

Where is the highest pressure in a hydraulic system?. At the system pump outlet. At the accumulator gas chamber. At the return line.

What causes a hydraulic system to chatter?. Cavitation, air bubbles or worn seals causing pressure fluctuations. Excessive hydraulic fluid volume. Too much accumulator charge.

How many microns are in a micron filter?. Hydraulic paper 5, metal 3, fuel 50, pneumatic 15. Hydraulic paper 3, metal 5, fuel 40, pneumatic 10. Hydraulic paper 1, metal 8, fuel 20, pneumatic 5.