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Frequently Asked Questions
Why is my new engine control too long/short?
There are several things that could be different such as engine/aircraft modifications, rigging/clocking of control arm or adjustment of rod end will be needed, placement of clamps or brackets may be different, or a previous installation change such as routing from original.
Can I install SAFE-HEET on an induction box/Plenum?
On some aircraft (like the Lycoming IO-540 engines) the induction box covers up the oil pan where the SAFE-HEET would normally be installed. It is permissible for the SAFE-HEET to be installed on the induction box, because the box/plenum is a thick casting that can transfer heat effectively.
Can I use temperature controller P/N 707 with a 220 Volt system?
No, you will need to use a converter that can supply 3 amps at 120 volts to operate both a SAFE-HEET and 707.
Can two SAFE-HEET engine heaters be connected to one temperature controller?
Yes, the 707 is rated at 600 watts. This is enough power to run two units by using a splitter.
Do you have any advice for installing a SAFE-HEET?
SAFE-HEET engine heaters are installed with a two-part adhesive. The engine heater can be installed quickly and easily by using the 707 temperature controller at half power. At temperatures below 70°F the temperature controller must be used to ensure proper adhesive cure. Proper adhesive cure is essential to full service life of the heater.
How long should I let the adhesive cure?
Twenty hours at a temperature of 70 degrees. If using a temperature controller you can turn the thermostat to about 110 degrees and it will take about seven hours to cure
I don’t think enough adhesive was supplied with my SAFE-HEET. Can you send me more or can I use the silicone adhesive?
The amount of adhesive contained in each kit is enough to do one installation and offers better thermal heat transfer than using a larger quantity. The adhesive should be thin, if there is no adhesive 1/8” from the edge of the pad it will not be a problem because our adhesive is totally resistant to solvents or oils. Sealing the edges is not necessary. Using silicone adhesives will allow the heat pad to come loose because silicone is not resistant to solvents or oils. If you feel you need more adhesive, we will send you more at no charge upon request.
Is there a SAFE-HEET designed to be used with 240 volts?
No, neither a SAFE-HEET nor Temperature Controller should be plugged into 240 volts. You can use a system with an adapter that reduces the voltage to 110 and can supply at least 3 amps.
My GFCI is not working.
Reference the troubleshooting instructions provided with the purchase of a SAFE-HEET. The GFCI will not work unless plugged directly into an outlet. Plug in the GFCI then the temperature controller. The GFCI needs to be the first thing plugged into the circuit. The GFCI needs full voltage to engage. It cannot have an extension cord plugged in the outlet, then the GFCI to the SAFE-HEET. The GFCI does reset itself every time it is unplugged.
Should I leave the heater plugged in all the time?
Yes, if the temperature is controlled to prevent condensation which can lead to corrosion.
What are the watts of SAFE-HEET?
| P/N | Dimensions | Watts |
| 700 | 4 inch x 4 inch | 200 Watts |
| 705 | 7.5 inch x 3.5 inch (diamond) | 150 Watts |
| 720 | 7 inch x 4 inch | 300 Watts |
What does it cost to operate the SAFE-HEET?
It costs about 3 cents per hour to operate.
What does the GFCI do?
The GFCI protects the SAFE-HEET and engine from any electrical fault situations by shutting off power to protect people and the engine. Abuse of the power cord can cause dangerous electrical failures.
What setting do I place the 707 controller to get my engine at a certain temperature?
This is determined by experimentation on knob settings and several variables such as ambient temperature, wind, size of engine/propeller combination and insulation of engine cowling.
Why should I buy the McFarlane brand?
McFarlane’s adhesive is thermally conductive, so it transfers heat effectively while the other brands use a peel and stick tape that tends to fall off. As a result, McFarlane’s has a longer life over the other brands. McFarlane’s adhesive is resistant to solvents/oils but if it ever does fail, the heat pad is not going to jam up anything in the engine compartment, because it is not a solid metal like other brands out there. SAFE-HEET heats the engine oil while other brands heat the cylinder, not the oil. SAFE-HEET is safe and is electrically grounded with a ground wire. The SAFE-HEET pad covers a large surface. McFarlane’s GFCI can be used with any heater, not just SAFE-HEET.
Why should I purchase a complete kit?
The kit includes the SAFE-HEET and temperature controller. The temperature controller makes installation easier and helps control condensation which leads to corrosion. It is like a dimmer switch that puts you in control of how much power is going to the unit.
Are templates required for Piper seat rails?
No, McFarlane does not provide templates for installing seat rails on Piper aircraft because the rail is riveted to the floor of the airplane, making installation easy by riveting directly from under the airplane.
Can I replace rivets with screws when replacing my seat rails?
Yes, but there are some restrictions. The screws must be structural screw with a minimum tensile strength of 50ksi. See SAIB CE-90-03R2 for more details.
Can use blind rivets (e.g., CherryMAX or CherryLOCK) when replacing my seat rails?
We do not recommend using blind rivets for seat rail installation.
How do I know which Piper seat adjustment spring to purchase?
Aircraft make, model and serial number are not sufficient to ensure the correct replacement spring as many aircraft may have been originally equipped with either one or retrofitted with a conversion kit. If the spring you are replacing is marked with a brand name (e.g. P.L. Porter or Stabilus) the correct replacement is readily identified. The coil spring/hydraulic style are also identifiable by a 1¼" diameter visible coil spring. The thread may also be measured to verify the correct identification.
Why choose McFarlane?
OUR PARTS ARE ENGINEERED TO LAST LONGER WHILE SOLVING KNOWN SAFETY ISSUES
OVER 40,000 PARTS IN STOCK WITH SAME DAY SHIPPING IF ORDERED BY 3PM
OUR TEAM PROVIDES THE OLD-FASHIONED CUSTOMER SERVICE THAT YOU EXPECT
