For experimental aircraft, no paperwork is generally required to add
a preheater to your engine. Just be sure that your installation is airworthy. Pay special attention to possible hot spots, places where
wires can get tangled, and interference with your cooling or
exhaust system.
For certified aircraft and light-sport aircraft (LSA), systems that
do not stay attached to the engine or airframe—heated dipsticks
replaced before flight, external blowers, most blankets, and the many
pad heaters—require no paperwork. Some simple pad systems (e.g.,
Design Logic’s glue-on pads) require only a one-time FAA Form 337
(Major Alteration or Repair). Dedicated systems (e.g., Tanis) usually
require a supplemental type certificate. For these last two items,
remember that LSA regulations are more restrictive than Part 23;
there is no Form 337 for LSA, and any supplemental type certificate
needs the airframe (and/or engine) manufacturer’s approval.
While you’re waiting for that engine to warm up, don’t forget to
thoroughly de-ice the airframe!
Tim Kern, EAA 852075, is a private pilot and certified aviation manager as well as
an aviation writer and consultant based near Indianapolis. You can find him online at
www.TimKern.com. For service instructions and sources for preheat equipment, visit
www.SportAviation.org.
