Sky-Tec's master PMA authorization letter from the FAA

Notes of explanation on Lycoming Applications:

All Sky-Tec Lycoming starters are manufactured under authority of the FAA via FAA PMA supplements listed above.  Lycoming Service Instruction 1154(current revision) provides additional documentation authorizing these starters to be installed as a replacement for identical or any previously certified Lycoming starter.   Prior to these methods of eligibility, Sky-Tec HT, PM & LS starters were certified via FAA STC.  Those STC's are no longer relevant.  Again, all new installations of Sky-Tec starters are eligible via FAA PMA.  No STC or 337 paperwork is required for Sky-Tec Lycoming starter installations.

Also, some foreign governing entities will require additional authority for installation of an FAA-PMA part.  One that comes to mind is the 149-NL/ec starter on the 24V Cessna 172R & S and 182S product lines which is authorized by Cessna CPDS (use your CPDS access to verify).
 

Notes of explanation on Continental Applications:

Sky-Tec starter C12ST2 is certified by PMA PQ0852SW Supplement 5 as a replacement part for OEM Continental O-200 "key start" starters and authorization is by the PMA PQ0852SW Supplement 5.  Therefore, no 337's are required for these applications.  Like the Lycoming starters, the only paperwork required is an engine logbook entry by the installing A&P and a W&B change in the AFM.

Sky-Tec starter C12ST2/S is certified by PMA PQ0852SW Supplement 5 as a replacement part for OEM Continental IO-240 "key start" starters.  Therefore, no 337's are required for these applications.  Like the Lycoming starters, the only paperwork required is an engine logbook entry by the installing A&P and a W&B change in the AFM.

Starter C12ST2/S is also certified for use as a replacement for OEM Continental pull-type starters on Continental Engines C85-12 through O300-C by Supplemental Type Certificate (STC) by means of modifying the engine per STC SE10076SC (see Converting a Pull-Start).  Additionally, the installation of a push-button switch to operate the starter is authorized in STC SA10077SC which details replacement of a factory pull-start mechanism with the Sky-Tec supplied push button switch and wiring (supplied with starter in KCST2 or separately as KCSW).  Important note:  Replacing the original pull-start mechanism with a key-start is NOT certified under this STC, nor is doing so recommended by Sky-Tec.  Doing so on a certified aircraft will require the aircraft owner to seek a Field Approval by an appropriately certified FAA representative.

Ancient History for Lycoming Applications:

Sky-Tec LS, PM and HT starters were originally certified with eligibility via STC (see Lycoming Starter STC's below).  If on the slim chance your starter installation was approved under STC eligibility, your installation required an FAA form 337 to be filed by an IA.  The STC's (no longer used but still valid) are:

Although PMA certification by test & computation supersedes the need for the use of the STC as authority for installation, an installation by STC is still valid.

Notes of explanation on Franklin Applications:

Sky-Tec F12ST1 are no longer in production but serviceable units are eligible for installation by PMA PQ0852SW Supplement 4 as replacement parts for all previously certified starters on Franklin engines 4A-235 thru 6V-350. Like the Lycoming installations, the "FAA-PMA" nameplate on the starter, logbook entry by certified A&P and a W&B change in the AFM are all that are needed to certify the installation of Sky-Tec's Franklin starters (copies of the PMA are for your information only and are never required for certification).

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