SAS-4-9

The SAS-4-9 is an onboard aircraft emergency, warning, and advisory signal system designed to alert the flight crew to failures, abnormal operating modes, and changes in system status using visual and audible indicators. The system enables timely crew response to technical malfunctions and provides structure for prioritizing aircraft system warnings.

SAS-4-9 receives discrete signals from aircraft systems and relay-type sensors, processes the inputs, and generates commands for cockpit annunciators, crew alert panels, and intercom-linked audio alerts. The system supports three tiers of alerting: emergency (critical), warning (attention required), and advisory (status or informational).

The system is installed on aircraft platforms such as the Yak-42 and Il-86, and may be integrated on other aircraft equipped with compatible electrical signaling architecture. SAS-4-9 operates from the aircraft 24–29.4 V DC power supply and maintains functionality in degraded power conditions down to 18 V.

The complete SAS-4-9 system consists of three functional hardware units:
• BAP-1 — Emergency and Warning Signal Processing Unit
• BU-1 — Advisory Signal Unit
• BK-7 — Switching/Distribution Unit
Together they accept incoming discrete signals, route logic, and drive cockpit annunciation outputs.

SAS-4-9 supports the “Flashing” mode for annunciators, ensuring increased visibility for critical indications and enabling crew prioritization.

Purpose: Automatic crew notification of failures, abnormal modes, and system status
Systems: Aircraft emergency, warning, and advisory annunciation system
Application: Yak-42, Il-86 and compatible aircraft platforms
Product Type: Integrated cockpit alerting and annunciation system
Signal Inputs: Discrete relay-type inputs 18–29.4 V, any polarity
Alert Modes: Emergency, warning, advisory
Output Signals: Cockpit annunciators, central warning light, crew intercom audio
System Composition: BAP-1, BU-1, BK-7
Power Supply: 24–29.4 V DC
Emergency Operation: Down to 18 V DC
Maximum Power Consumption: Up to 7 W per channel at 27 V
Flashing Mode Frequency: 2.6 Hz (nominal)
Installation: Permanently mounted avionics system with cockpit integration
Supported Channels: Up to several dozen depending on configuration (BAP-1 supports up to 30)
Condition: As applicable
Documentation: Technical passports for BAP-1, BU-1, BK-7 and the consolidated SAS-4-9 system

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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.