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Questions and Answers
What primarily holds the landing gears in their up position?
What occurs when there is a loss of hydraulic pressure in the landing gear system?
Which component assists in the extension of the nose gear during hydraulic loss?
What mechanism allows for the emergency lowering of the landing gears?
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What maintains each downlock hook in the locked position once the gears are down?
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Study Notes
Landing Gear Operation
- Each landing gear is operated by a single hydraulic cylinder connected to specific assemblies: the drag link for the nose gear and the side brace link for the main gears.
- Gear doors are designed to partially enclose the landing gear and operate via mechanical linkages.
- The landing gears are maintained in the retracted position solely by hydraulic pressure within the cylinders, with no uplocks present.
Emergency Procedures
- In case of hydraulic pressure loss, the landing gears will fall freely due to the absence of uplocks.
- Normal gear extension and retraction is accomplished using a gear selector handle; failure of hydraulic or electrical systems allows for manual operation.
- An emergency extension knob can be pulled to open a free fall valve, equalizing hydraulic pressure on either side of the nose gear cylinder, enabling the gear to drop into the downlocked position.
Additional Support Features
- To facilitate the nose gear extension under emergency conditions, a dual spring system is mounted on the gear link arms.
- The main landing gears do not require assist springs for operation.
- Upon the landing gear reaching the down position, downlock hooks engage and remain locked by a spring until hydraulic pressure is reapplied to release them.
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Description
This quiz covers the operation of landing gear systems, focusing on hydraulic mechanisms and emergency procedures for gear extension and retraction. Questions will explore the roles of various components and actions taken during hydraulic pressure loss, providing crucial knowledge for aircraft operation.
