| 摘要 |
A measuring device (1, 12, 13, 14) is equipped with a blade angle indicator (1) indicating the blade angle adjustment of the rotor blades of a helicopter, a pressure altimeter (13) and an outside temperature probe (14). The measuring device (1, 12, 13, 14) is linked to a control device (4-6) which has a central processing unit (4) and a program memory (5). The memory (5) stores data processing instructions for determining density height from pressure height and outside temperature as well as data processing instructions corresponding to the helicopter operating instructions for determining the permissible maximum value of the blade angle from the density height. The control device (4-6) periodically determines the density height on the basis of the prevailing pressure height and outside temperature and the corresponding permissible maximum value of the blade angle. It compares the blade angle value of the blade angle indicator (1) with the maximum value and when the value exceeds the maximum value controls an audible signal generator (21) linked to the transceiver (20) of the helicopter which emits an audible signal to the headphones (23) of the transceiver for as long as the value is exceeded.
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