3. SYSTEM OVERVIEW
3.1 GENERAL DESCRIPTION
The Electrical De-Ice Controller (EDC) is a control device which provides a timed control sequence in a
repetitive cycle for operation of propeller De-Icers in an electrical propeller de-icing system.
There are two main Types, the first type of EDC is made to replace old existing De-Ice Timers and delivers
basic functions, the second type is for new installations and delivers advanced functions.
Generally, the EDC provides following main features:
•Supply power to propeller De-Ice boots or other electrically heated airframe parts (heaters).
•Sequencing single and / or multiple heaters or De-Ice boots
•Control, status, and supervisory input / output signals for advanced models
•“Plug&Play” replacement of outdated propeller De-Ice timer devices from third party
manufacturers.
Up to four (depending on model) power outputs can be used to supply electrical De-Ice boots or other
heaters. The EDC is available with different timing sequences. These define the time and order in which
the outputs are enabled.
For control via external systems advanced EDC models accepts discrete input signals e.g. “heater
enable”, “self-test” or “weight-on-wheels”.
To provide functional safety the advanced EDC is equipped with in-device supervisory features:
•Self-test capability
•Over- & undercurrent detection
•Warning & status outputs
These features enable a wide range of applicability especially for modern type aircraft and avionics
systems where additional control and status capability is required.
However, the EDC is also available for retrofit(basic) application where minimum installation effort is
desired. With its formfactor and connector pinout, direct replacement of outdated controllers in many
aircraft is possible.
3.2 MODEL DESIGNATION
P-6 DC –1 / 3E1964-20
1 2 3 4 5
Legend:
1 P = Propeller accessory
2 6 = Manufactured for MT-Propeller by Avionik Straubing Entwicklungs GmbH
3 DC = De-Ice controller
4 1 = Internal Design Version
5 3E1964-20 = Application Number similar to other available Deice Timers (see Table 3)
S/No. 20 DC 003 –F
a b c d
a= Year of Manufacture
b= Electrical De-Ice Timer
c= Consecutive Number
d= Modification Status
