3027 (A-034-4-22)

Formation of audible warning signals

The 3027 board is intended to form and control audible warning signals associated with radio altimeter operation. Within the indicator, it provides generation, processing, and output of audio signals used for crew notification when predefined altitude thresholds or operating conditions are reached. The board operates in conjunction with other indicator and radio altimeter modules to ensure correct warning logic.

Operation in the A-037 radio-altimeter system

The Audible Indication Assembly Board 3027 is not a standalone device and is designed exclusively for use within indicator units A-034-4-16, A-034-4-22, and A-034-4-11 that are part of the A-037 radio altimeter system. Electrical operating modes, functional characteristics, and performance parameters of the board are defined at the system level and are regulated by the technical documentation of the indicator and the radio altimeter.

Printed-circuit board construction

Structurally, the board is manufactured as an electronic printed circuit board installed inside the indicator housing. The design ensures electrical and functional compatibility with other boards of the indicator and stable operation under specified operating conditions.

Technical data and service-life context

According to the product passport, the section “Basic Technical Data” for the Audible Indication Assembly Board 3027 is not specified. Reliability parameters, service life, and storage life correspond to those of the A-037 radio altimeter and its associated indicator units.

Installation and documentation requirements

Operation of the Audible Indication Assembly Board 3027 is permitted only in accordance with the applicable technical documentation of the indicator units and the radio altimeter system.