有人说，飞行员在没有动力后，是有意不放起落架，为了更好的滑翔。 我看是没有时间去放起落架了。 听听chatGPT怎么说的。
Question: If boe 737-800 loses power in both engines, can it still release landing gear quickly?
Answer: If a Boeing 737-800 (or similar model) loses power in both engines, it can still release its landing gear, but the process might be more challenging and slower depending on the circumstances. Here’s why and how:
Landing Gear Deployment in a Dual Engine Failure
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Hydraulic Systems and Engine Dependency:
- The 737-800 typically relies on hydraulic power generated by the engines to operate the landing gear.
- In the event of a dual engine failure, hydraulic power from the engines would be unavailable.
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Alternate Hydraulic Sources:
- The aircraft has an Auxiliary Power Unit (APU) and an Electric Motor-Driven Hydraulic Pump that can provide limited hydraulic pressure if electrical power is available.
- The aircraft's Ram Air Turbine (RAT), in some models or emergency kits, can also provide hydraulic and electrical power by using airflow over the aircraft in flight.
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Gravity-Free Fall Release:
- If both engines fail and hydraulics are unavailable, the 737-800 has a manual or gravity-assisted free-fall mechanism to extend the landing gear.
- This mechanism disengages the landing gear locks, allowing the gear to drop into place under its own weight and aerodynamic forces.
- Pilots may need to use manual levers to ensure proper locking of the landing gear after it extends.
Key Considerations
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Speed and Altitude:
- The gravity-free fall mechanism requires sufficient airflow (airspeed) to assist in gear deployment. At very low speeds or altitudes, this could be problematic.
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Electrical Power:
- Electrical systems must remain functional for cockpit indications, such as confirming that the landing gear is locked in the down position.
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Time Factor:
- Deploying the landing gear using the emergency mechanism takes more time than using standard hydraulic systems. Pilots need to act quickly and deliberately.
Conclusion
In a dual engine failure, the Boeing 737-800 can still extend its landing gear using an emergency gravity drop system. However, this process requires additional effort, and the absence of hydraulic and electrical power could complicate the deployment. Proper training and prompt action by the flight crew are critical to ensuring a successful gear extension under such circumstances.
