ALCOR - 86251 - CHT Thermocouple

FAA-PMA/STC SA 522 SW: This product is FAA approved for installation on ALL piston engine aircraft. After installation of complete system, return aircraft to service via Form 337 referencing STC SA 522 SW (see below). This is not required for replacement parts. All piston powered aircraft, regardless of make, are covered by this STC.

Details
P/N: 86251
Bayonet Style
Approximately 15.0" long
Lead: Yellow/Black
Resistance: 0.24 ± 0.05 Ohm
Grounded

Specifications
Dimensions: NA
Weight: 0.12 lbs
Type: J
Accessories: 28202 Adapter

b>GENERAL INFORMATION
Gasket style Cylinder Head
Temperature thermocouples can
read 50°F to100°F (normally about 60°F)
more than bayonet style CHT’s. When
replacing an existing CHT probe (thermocouple) the same cylinder should be used from
where the old probe was removed. Some engines do not have thermowells to install bayonet
probes so gasket types must be used. In cold climates, thermowells are sometimes used
for heater installations. Spring loaded bayonet types are more accurate than simple screw
in types because the probe touches the bottom of the thermowell and senses metal rather
than air temperature. If installing a new single probe system the original system must be left
intact unless a FAA 337 form is completed to approve its removal. Ensure that the probe
installed is the same type as the
one removed by comparing color of
wires. Some competitor's probes
use red and white colored wires,
which are the same as yellow and
black wires. Do not confuse thermocouples
with thermistors. Thermocouples produce millivolts, while thermistors change resistance. All
work to be done in accordance with FAA, Advisory Circular 43.13-1A.