Which hydraulic system maintains pressure to hold the Main Landing Gear in the retracted position?

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Prepare for the GoJet Airlines CRJ-550 Test. Use flashcards, multiple choice questions, and detailed explanations to ace your exam!

Multiple Choice

Which hydraulic system maintains pressure to hold the Main Landing Gear in the retracted position?

Explanation:
Holding the Main Landing Gear in the retracted position is accomplished by a hydraulic up-lock that must stay pressurized to keep the gear latched up. On the CRJ-550, hydraulic system 3 provides that hold pressure. Once the gear retracts, system 3 keeps pressure in the gear actuation and up-lock mechanism, resisting gravity and airframe vibrations so the gear stays up until the aircraft is ready to extend it again. The other hydraulic systems are used for different functions and do not supply the hold pressure for the up position.

Holding the Main Landing Gear in the retracted position is accomplished by a hydraulic up-lock that must stay pressurized to keep the gear latched up. On the CRJ-550, hydraulic system 3 provides that hold pressure. Once the gear retracts, system 3 keeps pressure in the gear actuation and up-lock mechanism, resisting gravity and airframe vibrations so the gear stays up until the aircraft is ready to extend it again. The other hydraulic systems are used for different functions and do not supply the hold pressure for the up position.

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