ATR 72 – Landing gear - SmartCockpit - Airline training guides, Aviation, Operations, Safety

The Antiskid control for outboard wheels is supplied by the:

DC EMER BUS

DC ESS BUS

DC STBY BUS

Correct! Wrong!

Antiskid control for inboard wheels is supplied by the DC ESS BUS

The landing gear position detection and indication systems has two independent systems. Each system uses its own detectors and indications:

Downlock and air/ground signals from proximity sensors. Uplock signal from mechanical limit switches.

Downlock and air/ground signals from mechanical limit switches. Uplock signal from proximity sensors.

Downlock, uplock and air/ground signals from multi proximity sensors.

Correct! Wrong!

MFD Indication – What is the meaning of this NORM BRK LDG GEAR display?

Loss of green hydraulic system pressure (below 1 500 psi).

Emergency braking not available pressure below 1 600 psi

Emergency braking is active.

Correct! Wrong!

Landing gear extension and retraction is performed by a control lever on the center instrument panel. The MFC electrically controls the:

Landing gear selector valve in the RH main landing gear fairing.

Landing gear selector valves in the LH and RH main landing gear fairing.

Landing gear selector valve in the LH main landing gear fairing.

Correct! Wrong!

This valve supplies hydraulic pressure (green system) to gear extension hydraulic line and connects the retraction line to tank return for extension, or gear retraction hydraulic line and connects the extension line to tank return for retraction.

Nosewheel steering is provided via a servomechanism mechanically controlled from the flight compartment and powered by the blue hydraulic system. Control is achieved using the steering control hand wheel mounted on the captain's lateral console. Nose steering angle is:

Plus or minus 60 degrees

Plus or minus 80 degrees

Plus or minus 70 degrees

Correct! Wrong!

Antiskid Panel - If the TEST pb is pressed the button initiates an automatic sequential test to check the primary antiskid protection capabilities of the system. The test duration is approximately 3 seconds in flight and 6 seconds on ground. If initiated on ground when brake pedals are pushed, the test duration is sufficient to enable observation of the brake compression and release. WHEELS A-SKID amber caution is displayed on EWD. The test is inhibited if wheel speed exceeds:

17 kt.

10 kt.

25 kt.

Correct! Wrong!

Nosewheel steering is provided via a servomechanism mechanically controlled from the flight compartment and powered by the _____.

Blue and green hydraulic systems

Blue hydraulic system

Green system

Correct! Wrong!

Emergency-Parking Brake Handle – If brake handle is not in the fully released position, amber PRKG BRK caution light comes on on EWD and is taken into account by the T.O CONFIG warning system.

True.

False.

Correct! Wrong!

BRK TEMP HOT-Alert – Brake temperature is over:

150 deg.C

190 deg.C

210 deg.C

Correct! Wrong!

The antiskid system includes locked wheel protection to avoid tire burst. The system compares inboard main wheels speeds and also outboard mains wheels speeds. When aircraft speed is above _____, if the differential speed (inboard or outboard) is at or above 50 % then the brakes are released.

10 kt.

15 kt

23 kt

Correct! Wrong!

The landing gear position detection and indication systems has two independent systems. Primary system is managed by MFC module 1A. The associated gear position is displayed on the main instrument panel. Secondary system is managed by MFC module 2A. The associated gear position is displayed on the overhead panel.

False.

True.

Correct! Wrong!

In the event of normal system failure the landing gear can be extended mechanically. The system is controlled from the flight compartment via a push/pull handle that enables mechanical unlocking of the landing gear. The landing gear extends due to gravity and aerodynamic forces.

Main and nose landing gear extension is assisted by a gas actuator and integrated springs.

Main landing gear extension is assisted by a gas actuator and integrated springs. Nose landing gear is assisted by a mechanical device.

Main landing gear extension is assisted by a mechanical device and integrated springs. Nose landing gear is assisted by a gas actuator.

Correct! Wrong!

In case of ground speed over _____ all tyres must be replaced.

155 kt

180 kt

165 kt

Correct! Wrong!

The main gear wheels are fitted with _____ fusible plugs (overheat protection) and one pressure relief valve (overpressure protection).

Two

Four

Three

Correct! Wrong!

These devices protect against tire and wheel burst in the event of overpressure overheat at fuse location. These fusible plugs are designed to release internal pressure if the wheel temperature reaches a preset value. The wheels are fitted with tubeless tires.

Each main gear includes a door mechanism attached to it. The door is hydraulically operated by the gear during retraction and extension.

False.

True.

Correct! Wrong!

The door is mechanically operated by the gear during retraction and extension.

MFD Indication – What is the meaning of this display?

Emergency braking is active.

Emergency braking not available pressure below 1 600 psi.

Emergency braking is active and accumulator pressure is at or above 1400 psi.

Correct! Wrong!

In the event of electrical supply loss:

The antiskid is no more operative and brakes are directly operated.

The antiskid system is limited to one brake application.

The antiskid system is degraded and the flight crew should switch the system off.

Correct! Wrong!

The antiskid system operates as soon as the gear is down and locked, and as long as the aircraft speed exceeds _____.

20 kt

25 kt

10 kt

Correct! Wrong!

Landing gear extension and retraction is performed by a control lever on the center instrument panel.

Uplocking is mechanically achieved. Unlocking is hydraulically achieved.

Uplocking and unlocking are hydraulically achieved.

Uplocking is hydraulically achieved. Unlocking is mechanically achieved.

Correct! Wrong!

Nosewheel deflection of plus or minus _____ is possible during towing with no pressure in the system.

81 degrees

101 degrees

91 degrees

Correct! Wrong!

Emergency-Parking Brake Handle – It controls emergency and parking braking mode through the emergency and parking metering valve (spring-loaded to the OFF position). In case of hydraulic power system failure, the brake accumulator enables at least _____ braking applications.

Seven

Six

Five

Correct! Wrong!

Landing Gear Position Indicator – It comes on green when respective downlock is engaged.

UNLK comes on red if respective gear is not locked in accordance with the lever selected position.

UNLK comes on red if respective gear is not locked in accordance with the lever selected position or, if on ground, the uplock box is not powered.

UNLK comes on red if respective gear is not locked in accordance with the lever selected position or, if on ground, the uplock box is not in the open position.

Correct! Wrong!

Antiskid System - Touchdown Protection. At main gear compression, the braking action is inhibited as long as wheel spin up is _____, in order to prevent inadvertent brake application on low friction pavements or with light wheel vertical loading. In the event of electrical supply loss, the antiskid is no longer operative and brakes are directly operated.

Below 20 kt or for 2 seconds

Below 25 kt or for 3 seconds

Below 35 kt or for 5 seconds

Correct! Wrong!

In the event of electrical supply loss, the antiskid is no longer operative and brakes are directly operated.

The landing gear position detection and indication systems has two independent systems. Each system commands gear extension and retraction, gear anti-retraction system and the warning associated to 'LDG GEAR NOT DOWN'. Gear must be considered down if one system indicates 3 green lights.

True.

False.

Correct! Wrong!

The four main gear wheels are equipped with multidisc brakes, each operated by hydraulically powered pistons. Two modes are available: Normal where the flight crew controls the brakes via the brake pedals (supplied by the blue system). Emergency and braking: The flight crew controls the brakes via the emergency and parking brake handle (supplied by the green system).

False.

True.

Correct! Wrong!

The flight crew controls the brakes via the brake pedals (supplied by the green system). Emergency and braking: The flight crew controls the brakes via the emergency and parking brake handle (supplied by the blue system).

A red light is inserted in the LDG GEAR lever. If any one of the gears is not sensed in the down and locked position the light comes on and the FWS will be activated through the MFC.

False.

True

Correct! Wrong!

Two doors close the nose gear and restore the fuselage profile. The doors are actuated mechanically by the gear.

True.

False.

Correct! Wrong!

Four doors close the nose gear and restore the fuselage profile. The doors are actuated mechanically by the gear. The two forward doors are closed after gear extension. The two aft doors remain opened while the gear is in extended position.

ATR 72 – Landing gear