MIL-DTL-27723F
3.6.10 Deicing heater element life. The heater power consumption (see 4.6.10) shall
change no more than 10 percent after a deicing heater element life test. No damage shall result
that would otherwise affect proper operation of the probe.
3.6.11 Insulation resistance of deicing heater element. The deicing heater element shall
have an insulation resistance greater than 1 megohm when measured with 500V root mean
square (rms) 60 hertz current applied.
3.6.12 Still air operation. The probe, while in room temperature air, shall be capable of
withstanding the heat caused by the operation of the deicing heater.
3.6.13 Low temperature exposure and power consumption. After exposure to a
temperature of -70°C and when power is applied to the heater element, the initial power surge
shall not exceed 1,200W. After 5 seconds, the power consumption shall not exceed 700W and
after 20 seconds it shall not exceed 500W.
3.6.14 High temperature exposure. After high temperature exposure, the resistance of
the temperature-sensing element determined at 0°C and at 100°C shall not differ by more than
the equivalent of 0.2°C from the resistance values before high temperature exposure.
3.7 Part numbering and interchangeable parts. All parts having the same manufacturer's
part number shall be functionally and dimensionally interchangeable. The item identification and
part number requirements of MIL-DTL-31000 shall govern the manufacturer's part numbers and
changes thereto.
3.8 Operating power. The deicing heater element shall operate on 115V, 400 hertz
alternating current (AC).
3.8.1 Heater power consumption. The nominal heater power consumption shall be 350W
when the heater is operating under in-flight icing conditions with the static temperature ranging
from -10° to -35°C and an indicated air-speed of from 200 to 350 knots.
3.9 Weight. The weight of the single-element probe shall not exceed 400 grams and the
weight of the dual-element probe shall not exceed 500 grams.
3.10 Identification of product. Equipment, assemblies, and parts shall be marked for
identification in accordance with MIL-STD-130.
3.11 Workmanship. The probe shall be constructed and finished paying particular
attention to neatness and thoroughness of soldering, wiring, marking of parts and assemblies,
plating, welding, brazing, and freedom of parts from burrs and sharp edges.
3.11.1 Cleaning. The probe shall be thoroughly cleaned and loose, spattered, or excess
solder, metal chips, and other foreign materials shall be removed during and after final assembly.
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