Spoilers and speed brakes are designed for airplanes that go very fast and don't like to slow down. They wouldn't do any good on a 152, because they don't fly fast enough to be effective. They'd just cause a stall a lot sooner. You usually don't have to worry about shock-cooling an engine unless it's turbo-charged (i.e. fast planes) or if it's -20 deg. F (like it is today. Brr.).
Knew a guy with spoilers on a C182 (there's an STC for that). He said he could get a killer descent rate with them with some power in and without screaming on the a.c. They'll help you slow down because you can pitch up further on the descent if you came in hot. These spoilers were only on the inboard edge of the wing and you'd still have flight control to normal control through normal stall speed (especially with stall fences etc).
Re on topic:
Center: Frontier 570, say current heading
Us: Frontier 570 currently flying heading of 250
Center: Frontier 570 give me a RIGHT turn to 240, vectors to intercept the localizer for 14 after you make the loop.
<a few minutes later>
Us: Anchorage Approach, Frontier 570, with you on the localizer runway 14.
Approach: Frontier 570, turn right heading 250, will be vectors to reintercept the localizer...
Anchorage was just chocked full of aircraft and freaking out... never flown in so many circles without holding before as they tried to adjust spacing...
