In February, Airservices Australia (AA) announced aircraft departing from Runway 21 at Perth Airport between 10pm and 5am would leave via Piara Waters, Southern River and Harrisdale before heading over Cockburn Central.
Planes usually leave via Shelley, Riverton and Rossmoyne to the south and Thornlie, Huntingdale and Gosnells to the east.
AA said the trial, run between February 15 and April 10, would be used to validate noise modelling data gathered in a previous assessment.
Yangebup Progress Association president Chontelle Sands said two-thirds of locals were affected negatively, with one-third unaffected.
“Of those impacted, they were constantly woken, kept awake, had houses shaking, had children scared, thought planes were going to land on the roof, etc,” she said.
She said the YPA was against the trialled routes being implemented permanently.
Canning Vale Night Flight Opposition co-ordinator Joanne Norman said the trial was worse than expected, with departing planes adding to the noise already generated from big jets arriving into Perth, and smaller aircraft using Jandakot Airport.
“We understand Perth is a busy airport but we’re already sharing the burden,” she said.
In a statement, AA said the study would enable it to compare modelled actual aircraft noise data used in an environmental assessment that indicated a night-time respite would not yield an overall noise improvement for the Perth community.
The data will be analysed and published in a report.