BDK-1

BDK-1 remote correction unit

BDK-1 is an aircraft remote correction unit used in the TKS-P2 precision heading system. In the supplied context, the unit is associated with civil aircraft such as Tu-154, Il-62 and Il-76, depending on aircraft configuration and documentation. The unit allows the crew, usually the navigator, to manually enter a heading correction into the navigation system. BDK-1 is part of cockpit navigation equipment and is installed where it can be accessed during flight.

Function of BDK-1 in the TKS-P2 system

The main function of BDK-1 is manual input of correction into the current heading signal generated by the TKS-P2 heading system. This correction is then used by the navigation computer, such as NVU-B3, for route calculation and coordinate dead reckoning. The unit converts the mechanical rotation of the correction knob into an electrical correction signal. This allows the navigator to compensate for accumulated navigation error when automatic correction is unavailable or not reliable.

Use during navigation correction

BDK-1 is used when automatic correction of calculated coordinates cannot be performed, for example when signals from short-range radio navigation systems such as RSBN are absent or unusable. In this case, the navigator calculates the required correction manually, using lateral deviation and distance flown. The correction value is then set on the BDK-1 unit using the rotary control. This makes the unit an important manual backup element in the aircraft navigation workflow.

Indication and manual control

The correction value is entered manually using a rotary knob / fine-adjustment control. The supplied context describes a circular scale with pointer indication. The small pointer displays correction values in the range from 0 to ±170°, with a scale division of 10°. Depending on modification, a large pointer may provide more precise reading of degrees and fractions of a degree. The instrument face allows the navigator to set and monitor the introduced course correction during flight.

Cockpit installation of BDK-1

BDK-1 is installed in the cockpit, typically at the navigator’s workstation. In aircraft such as Tu-154B / Tu-154M, Il-62M or Il-76, it may be located on the left or right side panel of the navigator’s console depending on aircraft layout and modification. The unit is normally positioned near other navigation computer and TKS-P2 control elements. This location is necessary because the unit requires direct manual access during navigation correction procedures.

Identification and ordering of BDK-1

Before ordering BDK-1, the buyer should confirm the aircraft type, heading system configuration, required condition and documentation set. It is also important to confirm whether the unit is required for TKS-P2, NVU-B3 integration or another navigation configuration. The item may be required for cockpit navigation equipment repair, replacement of a defective correction unit, aircraft restoration or spare parts stock. Product passport, acceptance marks, serial number and bench-test records should be checked before shipment.

Product Type: Remote correction unit / aircraft navigation correction instrument
Designation: BDK-1
Russian Designation: БДК-1
Alternative Product Names: Remote correction block, course correction unit, heading correction unit, navigator correction instrument
Function: Manual input of correction into current heading / orthodromic course signal
Application / Where Used: Aircraft navigation and heading systems
System / Installation Area: TKS-P2 precision heading system / navigator’s cockpit panel
Associated Heading System: TKS-P2
Associated Navigation Computer: NVU-B3 according to source context
Associated Radio Navigation System Context: RSBN short-range radio navigation system, according to source context
Compatible Aircraft / Equipment: Tu-154, Tu-154M, Il-62M and Il-76 according to source context and documentation
Operating Use: Manual correction of coordinate dead reckoning when automatic correction is unavailable
Input Method: Manual rotary knob / fine-adjustment control
Correction Range: 0 to ±170° according to source context
Small Scale Division: 10° according to source context
Indication Type: Circular scale with pointer indication
Signal Function: Conversion of correction knob rotation angle into an electrical course-correction signal
Installation Location: Navigator’s workstation, side panel or instrument panel depending on aircraft layout
Construction: Compact cylindrical cockpit instrument for panel installation
Face Design: Round dial with protective glass, pointer indication and correction knob
Operating Environment: Aircraft cockpit pressure and temperature conditions
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, TKS-P2 documentation, NVU-B3 documentation, aircraft wiring diagram, connector pinout and bench-test records if available

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Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.