Landing Gear SystemsAircraft & Engines — DGCA CPL practice questions
Question 1 of 5
An oleo-pneumatic shock strut contains:
All 5 questions — Landing Gear Systems
Aircraft & Engines · DGCA CPL. The correct option is marked on each.
Q1. An oleo-pneumatic shock strut contains:
- A.Oil only
- B.Hydraulic fluid and compressed nitrogen✓
- C.Compressed air only
- D.Rubber blocks
Why: Fluid forced through an orifice damps the landing impact; the nitrogen charge acts as the spring supporting the aircraft.
Q2. Torque links (scissors) on a landing gear leg:
- A.Absorb landing shock
- B.Allow the strut to compress while preventing it rotating✓
- C.Steer the nosewheel
- D.Lock the gear down
Why: The hinged scissors connect inner and outer cylinders: free vertical travel, no rotation.
Q3. The gear selector cannot be moved UP on the ground because of:
- A.A hydraulic fuse
- B.Weight-on-wheels (squat switch) logic operating a selector lock✓
- C.The shimmy damper
- D.Brake pressure
Why: Air/ground logic locks the lever while weight is on the wheels; ground lock pins with red flags add a manual safeguard.
Q4. Emergency gear extension after hydraulic failure typically works by:
- A.A second engine-driven pump
- B.Releasing the up-locks and letting the gear free-fall and lock down✓
- C.Electric motors
- D.Bleed air pressure
Why: With up-locks released, gravity and air loads swing the gear into the down-and-locked position.
Q5. A shimmy damper prevents:
- A.Brake fade
- B.Rapid unstable oscillation of the nose wheel✓
- C.Tyre creep
- D.Gear retraction in flight
Why: The small hydraulic damper stops the nosewheel's rapid oscillations (shimmy) on takeoff and landing.