Good mentality of the pilots is the prerequisites for safe flight.

飞行员的心理品质是安全飞行的必备条件。

You're tipping too far forward for safe flight. Pull back on the stick and add power.

你已经倾斜到不安全的地步，拉杆并增加能量。

It is the important visual auxiliary navigation equipment to guarantee safe flight, and is an key link in the process of landing.

是保障飞机飞行平安的重要目视助航设备，在飞机进近和着陆过程中起着要害功效。

Qualification issues include design and testing required to maintain the combat capabilities of the UH-60 Black Hawk and the safe flight envelope of the aircraft with the tank.

该机的设计难点在于用户要求既要保持UH-60原有的攻击运输能力，又要在携带外部大型水箱的情况下保持飞行安全。