BK-7

BK-7 switching unit is an integral component of the SAS-4-9 aircraft alerting system.
It provides routing, commutation, distribution, and transfer of discrete signals between aircraft sensors, system control blocks and cockpit annunciators.

The BK-7 works together with the BAP-1 (emergency and caution unit) and BU-1 (advisory unit), forming a complete alerting and notification loop for the flight crew.
Incoming signals from onboard equipment are received, sorted, and directed to appropriate circuits in accordance with the SAS-4-9 logic.

In addition to routing, the unit generates control modes for the system, including:
• pulsed light operation,
• flashing regimes,
• driving the cockpit audio alert circuit at a defined output frequency.

BK-7 is designed for installation on aircraft equipped with SAS-4-9, including Yak-42, Il-86, and structurally compatible platforms.
The unit is engineered for continuous duty in the aircraft DC power environment and maintains operability under voltage drop, vibration, and wide temperature ranges.

Purpose: Signal switching, routing, and distribution within SAS-4-9
Systems: SAS-4-9 emergency/caution/advisory annunciation system
Application: Yak-42, Il-86 and compatible aircraft
Product Type: Switching and signal routing unit
Power Supply (Normal): 24–29.4 V DC
Power Supply (Emergency): Down to 18 V
Current Draw: Up to 0.5 A
Input Resistance: 300–550 Ohm
Pulse Generator Output:
a) “Stable” mode 5.6–10.2 Hz
b) “Flash II” 2.6–3.2 Hz
Audio Output Frequency: 2000 Hz ±20%
Operating Temperature: −60°C to +60°C
Relative Humidity: Up to 100% at +35°C
Barometric Pressure Endurance: Up to 6.7 kPa
Weight: 2.1–2.15 kg
Package Contents: Mounting frame when applicable
Material Content: Gold 0.364 g; silver 81.16 g; palladium 0.159 g; aluminum 0.7 kg
Installation: Avionics frame/rack mounting
Condition: As applicable
Documentation: Passport 632.068.013 PS; SAS-4 system passport

All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.

In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.

Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.

Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.

Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

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.