JT8D Ground Operations
Something to think about during engine operation is there are toxic gases in the area behind the engine. These are hot and have high speed. Again it's common sense to stay out of these areas and also there area no items in that area that can be damaged.
The noise level is also high so wear ear protection, obey time distance restrictions.
There are some other
basic things to think about too:
Wind can affect good test results to get consistent reading the aircraft should point towards the wind. The wind speed should be less than 25 knots. The wind direction is not important wind speeds less than 8 Knots or blast fence is used.