PE-11M

PE-11M converter inside the SO-121VM system

The PE-11M is the electronic converter used in the SO-121VM aircraft icing detection system. It receives the signal from the external ice detector sensor and turns it into usable electrical commands for the aircraft. In the system layout, the DSL-40T sensor is exposed to the airflow outside the fuselage, while the PE-11M is installed inside the aircraft. This gives the system a practical split: the sensor detects ice where it actually forms, and the converter processes the signal in a protected equipment area.

Signal processing in the PE-11M unit

The converter tracks the signal coming from the icing sensor and reacts to changes linked with ice formation. When the sensor frequency goes outside the normal non-icing range and reaches the command generation zone, the PE-11M forms the required outputs. These outputs can be used by cockpit warning circuits, anti-icing logic, and monitoring equipment. The converter also handles command timing, so the aircraft does not receive random short pulses every time the sensor signal fluctuates for a moment.

PE-11M with the DSL-40T icing sensor

The PE-11M works directly with the DSL-40T membrane-type ice detector sensor. The sensor reacts to ice on its membrane, and the converter evaluates the electrical signal from that sensor. The PE-11M also supplies power to the sensor circuits, including the heating circuit needed for restoring the sensor after ice detection. If the converter or heater control is faulty, the sensor may be physically serviceable but the system will still not work correctly. For maintenance, both units have to be checked together, not separately by appearance only.

Commands generated by the PE-11M

The PE-11M generates command signals used by the aircraft systems after icing is detected. Depending on the aircraft wiring and installed equipment, these commands may be connected with anti-icing system operation, warning indication, heating logic, or recording of icing conditions. The unit has defined command durations and cancellation timing, which helps the system behave consistently after the icing signal appears or disappears. This is important in real flight, where icing may not be steady: ice can build up, break away, melt, and form again in short cycles.

Installation of the PE-11M on the RM-5 frame

The PE-11M is mounted inside the aircraft on the RM-5 frame. This installation keeps the converter protected from direct airflow, moisture, and external contamination, while still allowing it to stay connected to the external sensor. The mounting frame also makes replacement and inspection more convenient. During service, attention is normally paid to connector condition, mounting security, wiring, signs of overheating, and correct connection with the DSL-40T sensor. A problem at the frame or connector can cause the same symptoms as a faulty converter.

Aircraft use and replacement of PE-11M

The PE-11M is used on aircraft fitted with SO-121VM icing detection equipment, including An-38, An-74, Il-96-300, Ka-32 and Mi-26, depending on the installed system. It is part of the aircraft icing detection and anti-icing control chain, not a general-purpose electronic module. When ordering or replacing it, the full designation PE-11M / ПЭ-11М should be checked against the aircraft parts catalog and SO-121VM documentation. It is also necessary to clarify whether the requirement is for the converter only, or for a set with DSL-40T and RM-5.

Product Type: Aircraft electronic converter
Designation: PE-11M / ПЭ-11М
Function: Processing of icing sensor signals and generation of control commands
Application / Where Used: Icing detection, warning, anti-icing control, and monitoring systems
System / Installation Area: SO-121VM icing detection system
Associated Sensor: DSL-40T icing detection sensor
Associated Mounting Frame: RM-5
Installation: Internal aircraft mounting on RM-5 frame
Operating Voltage: 27 ±3 V DC
Current Consumption, Converter: Not more than 1 A
Current Consumption, Heating Circuits: Not more than 14 A
Output Voltage, Out.1: 1.5 V +0.7 / −0.5
Phase Shift: 58 ±10°
Command Generation Frequency: Above 6015 ±25 Hz
Frequency Range without Command Generation: 5000 to 6015 ±25 Hz
Command Duration, POS / BAR / Icing: 140 ±11 s
Command Duration, Heating: 8 ±2 s
Command Cancellation Time: 40 ±11 s
Output Command Voltage: 27 ±3 V DC
Switched Load Capacity: Up to 5 A for SO-121M; up to 1.5 A for SO-121VM
Compatible Aircraft / Equipment: SO-121VM-equipped aircraft and helicopters, including An-38, An-74, Il-96-300, Ka-32 and Mi-26 depending on configuration
Dimensions: 63 × 369 × 94.5 mm
Weight: Not more than 1.84 kg
Technical Documentation: PE-11M technical documentation, SO-121VM documentation, aircraft maintenance documentation as applicable

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