A320 Landing Gear Questions

Each main wheel has an antiskid brake.

• True.
• False.

Explanation: True — this is stated directly: each main wheel is equipped with an antiskid brake.

Landing Gear - General / Description

When the landing gear is gravity extended, will nose wheel steering be available?

• Only if the A/SKID & N/W STRG switch is selected ON.
• No
• Limited nose wheel steering is available only through the captain’s rudder pedals.
• Yes.

Explanation: No. Gravity extension works by isolating the landing gear (including its nose-gear hydraulics) from the green system and depressurizing it — and nose wheel steering needs green hydraulic pressure at its actuating cylinder to work, so it's unavailable once you've gravity-extended.

Landing Gear - General / Description (Gravity Extension)

The normal brake system uses _____ hydraulic pressure and the alternate brake system uses _____ hydraulic pressure backed up by the hydraulic brake accumulator

• Green – Blue
• Yellow – Blue
• Yellow – Green
• Green - Yellow.

Explanation: The normal brake system runs on green hydraulic pressure; the alternate system runs on yellow, backed up by the hydraulic accumulator if yellow is also lost.

Landing Gear - Brakes & Antiskid (Description)

If the landing gear was gravity extended using the hand crank on the center pedestal, landing gear position must be verified through:

• The landing gear viewers.
• The landing gear indications depicted on the ECAM and, if available, the center panel LDG GEAR indicator panel lights.
• Both are correct.

Explanation: ECAM (the WHEEL SD page, fed by both LGCIUs) is the primary check, with the center-panel LDG GEAR indicator panel as an extra cross-check when it's available — that panel depends solely on LGCIU 1 being powered, which isn't guaranteed after the kind of failure that forced a gravity extension in the first place.

Landing Gear Abnormal Procedures - Gravity Extension

The braking modes are:

• Green with anti-skid, Yellow without anti-skid, Parking brake.
• Green or Yellow with anti-skid, Yellow without anti-skid, parking brake
• Green with or without anti-skid, Blue without anti-skid

Explanation: Three modes exist: normal (green) braking with anti-skid, alternate (yellow) braking with anti-skid, alternate (yellow, or accumulator-only) braking without anti-skid, plus the separate parking brake — matching "Green or Yellow with anti-skid, Yellow without anti-skid, parking brake."

Landing Gear - Brakes & Antiskid (Description)

What happens to the other brake modes when parking brakes are applied?

• There is no change.
• All other braking modes and antiskid are deactivated.
• Antiskid mode only is deactivated.

Explanation: Applying the parking brake deactivates the other braking modes — the parking brake supplies its own fixed pressure through the handle rather than being pedal-modulated, so normal, alternate, and anti-skid braking functions aren't in play while it's set.

Landing Gear - Brakes & Antiskid (Description)

Which ADIRS close the safety valve of the green hydraulic supply when speed is > 260 kts.

• ADIRS 1 & 2
• ADIRS 1 & 3
• ADIRS 2 & 3
• ADDIRS 2 or 3

Explanation: This is closest to an abnormal-procedure note stating that an ADR 1+3 fault (or, just as validly, an ADR 2+3 fault) drives the gear safety valve closed. Of the choices offered, "ADIRS 1 & 3" matches the first-named pair from the FCOM, though "2 & 3" is described as equally capable of causing the same closure.

Flight Controls - Alternate Law (ADR Faults)

The maximum brake temperature limitation for takeoff exists to ensure that:

• Brakes do not fade during the takeoff roll
• Any hydraulic fluid that touches the brakes will not ignite in the wheel well after gear retraction
• The tires do not deflate from heat
• The anti-skid system remains active

Explanation: The 300°C takeoff brake-temperature limit (150°C if brake fans were used) is a fire-prevention limit: it keeps the brakes cool enough that any hydraulic fluid or other flammable fluid that might contact them in the unventilated wheel well after retraction won't ignite. The FCOM confirms the temperature figures themselves; this specific fire-safety rationale is standard systems-course explanation for why that number exists.

Landing Gear Limitations - Brake Temperature