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Jumper Wire 101

   

Each model of Sky-Tec starter may or may not ship with a jumper wire between the S-Terminal and the Power Terminal of the starter.  Here's a guide intended to help keep the variations straight.

 

Why a jumper wire?

 

Sky-Tec starters feature an integrated solenoid that is primarily used to physically push the drive gear forward into the ring gear.  Alternatively, in some applications, this solenoid may be wired to serve a dual purpose by also serving as the aircraft's main starter contactor (starter relay).   

 

Let us first look at an installation where the airframe is configured with a separate firewall starter solenoid or "starter contactor." 

 

 Here at Sky-Tec, we tend to refer to this type of installation as a "Certified Aircraft" installation because the vast majority of certified aircraft were certified with a starter contactor installed on the firewall (or similar location).  However, we realize there are some certified aircraft that were certified to use the starter's integrated starter contactor (Robinson Helicopters, for instance).  So while we delineate "Certified Aircraft" wiring from "Experimental Aircraft" wiring in this way, the definitions are not foolproof.  

 

HOWEVER, please note, if your aircraft was certified for use with a separate firewall starter contactor, you MUST continue to use that contactor and wire your starter according to the "Certified Aircraft" wiring diagram below.  

 

Robinson Helicopter's will be wired according to the "Experimental Aircraft" wiring diagram below (even though they are certified aircraft).  

 

And finally, experimental aircraft may be wired either way at the builder/owner's discretion.

 

SPECIAL NOTE REGARDING 12V/24V SWITCHABLE (STANDARD) NL MODEL STARTERS

 

Sky-Tec repurposed the S-Terminal functionality on NL model starters to serve as a means of switching the starter between 12V and 24V operation.  Because of this, ALL NL STARTER INSTALLATIONS MUST BE WIRED ACCORDING TO THE CERTIFIED AIRCRAFT WIRING DIAGRAM BELOW - NO EXCEPTIONS!  

 

SPECIAL NOTE REGARDING NL/ec* *24V SuperDuty MODEL STARTERS

 

Unlike the standard 12V/24V Switchable NL starter (above), the S-Terminal functionality is fully functional on NL/ec* *24V SuperDuty starters.  For any application using a separate starter contactor (starter relay), leave the jumper wire in place.  For 24V Robinson Helicopters or any experimental application desiring to use the starter's internal solenoid as the starter contactor, remove the jumper and bring bus power through the push-to-start switch to the smaller, S-Terminal to activate the starter.  

 

SPECIAL NOTE REGARDING START SWITCHES

 

Because Sky-Tec starters use their integrated solenoid to serve a MECHANICAL purpose (pushing the drive gear forward into the ring gear), switch connections to the S-Terminal must be capable of handling up to 30 Amps (30 Amps peak - 6 Amps nominal).  Therefore, it is imperative that IF YOU INTEND TO USE A RIGHT-LEFT-BOTH-START-TYPE KEY SWITCH, YOU MUST WIRE YOUR AIRCRAFT USING THE CERTIFIED AIRCRAFT WIRING DIAGRAM.  We are unaware of any key switches available on the market today that can safely carry the requisite 30 Amp peak load.

 

SPECIAL NOTE REGARDING HT MODEL STARTERS

 

HT model starters manufactured before 2006 featured an INTERNALLY jumped solenoid.  We figured there were very few, if any, experimental aircraft flying with 24V electrical systems so we hard wired the starters internally for certified 24V applications.  Well, Robinson Helicopter and an increasing number of experimental aircraft with 24V electrical systems persuaded us to move the jumper wire to the outside of the solenoid HT model starters just like it has always been on 12V models so that it may now be installed in either Certified or Experimental configuration.  

 

 

Certified Aircraft Wiring Diagram

Experimental Aircraft Wiring Diagrams

For 

Lycoming

PM/LS Starters

Click to Enlarge Diagram

Click to Enlarge Diagram

For

Lycoming

HT

Starters

Click to Enlarge Diagram

Click to Enlarge Diagram

Continental C12ST2 Starters

Click to Enlarge Diagram

Click to Enlarge Diagram

 

For NL Model Starters

 

  12V 24V
 

For

Lycoming

NL

Starters

 

 

Click to Enlarge Diagram

Click to Enlarge Diagram

 

For

Lycoming

NL/ec*

*24V SuperDuty

Starters

 

 

N/A  

 

Click to Enlarge Certified Diagram

 

 

 

Click to Enlarge Robinson/Experimental Diagram

 

 

 

 

 

 

 

 

 

 

 

 

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