It's not mandatory (at least in the U.S.), but certainly recommended.
Anywhere within the cowling where warm air will be blown into it. Drill a 3/16" hole, insert a punch, and bend upwards.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
Last edited by Mel : 07-26-2011 at 11:18 AM.
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