This is one in a series on the LAPD's helicopter fleet. You can read Part 1 here and Part 2 here. 

Helicopter noise - it's something Angelenos love to hate. Next week the Federal Aviation Administration is expected to release a series of recommendations that could muffle some of that noise in LA. But those recommendations are likely to exempt emergency helicopters such as the LAPD's 17 choppers, which happen to be the largest in the country. 

In the last of her reports on LA's police helicopters, KPCC's Erika Aguilar explores the issue of noise.