But Airservices Australia (AA) says data collected during the trial will be important for their overall efforts to reduce aircraft noise.
The trial, which started mid-February, means a change of flight plan for certain aircraft between 10pm and 5am.
Instead of flights leaving via the Shelley, Riverton and Rossmoyne area to the south, and the Thornlie, Huntingdale and Gosnells area to the east, they will instead go south towards Piara Waters, Southern River and Harrisdale before heading over Cockburn Central.
Yangebup Progress Association president Chontelle Sands said the trial had so far been frustrating for residents.
“Yangebup residents have definitely noticed a difference,” she said.
“It’s been quite loud at night, particularly around midnight. It’s quite frustrating, especially for shift workers.”
Bibra Lake Residents Association secretary Phil Barker said locals now had to contend with plane noise on top of the regular freight trains in the area.
“It’s frustrating because they say they’re spreading the burden, but now we’re being affected by the regular freight trains and planes,” he said.
A spokeswoman for AA said the study would allow it to validate noise modelling data used in an environmental assessment last year.
That assessment indicated there would be no noise improvement for people in Perth.
“This (study) will allow a direct comparison between actual noise data collected and the modelling data that was used in the environmental assessment,” the spokeswoman said.
“The location of the noise monitors have been selected to ensure data captured is reflective of the noise experienced by residents.”
Noise readings will be analysed and a report will be available when completed.