DA-30

DA-30 combined vertical-speed, turn and slip indicator

DA-30 is a combined cockpit instrument that brings together a metric vertical-speed indicator, a gyroscopic turn indicator and a ball-type slip indicator. The three functions share one housing and instrument face, allowing the crew to monitor climb or descent, the direction and relative intensity of a turn, and the coordination of the manoeuvre from a single panel position.

The metric DA-30 can be identified by the vertical-speed scale marked in metres per second. Its main scale covers climb and descent values up to 30 m/s in either direction. Because related versions use a similar cylindrical body and mounting flange, identification must be based on the face markings, scale units, electrical connection and the exact aircraft equipment documentation rather than appearance alone.

Vertical-speed measurement through the static system

The variometer section is connected to the aircraft static-pressure line. Static pressure reaches both the sensitive manometric element and the instrument housing, but calibrated restrictions create a short delay in pressure equalisation. When the aircraft climbs or descends, the temporary pressure difference moves the vertical-speed pointer. During steady level flight, the pressure equalises and the pointer returns towards zero.

The displayed range is from −30 to +30 m/s. Reliable indication depends on the condition of the static line, the pressure fitting, the internal capillary passages and the mechanical linkage. A leak, blockage or contamination can cause delayed or incorrect readings. The instrument should therefore be checked together with the aircraft static system and not treated as an isolated electrical indicator.

Turn and slip functions of the DA-30

The turn section uses an electrically driven gyroscope. The instrument face provides reference marks associated with bank angles of 15°, 30° and 45° at a reference flight speed of 400 km/h. The corresponding reference angular turn rates are approximately 1.3°/s, 2.9°/s and 5°/s. These markings help the crew assess the direction and relative rate of a turn.

The curved-tube inclinometer below the pointers contains a freely moving ball. Under the combined effect of gravity and lateral acceleration, the ball shows whether the aircraft is slipping or skidding. A centred ball indicates a coordinated manoeuvre. During inspection, the ball must move freely, while the gyroscopic pointer should respond smoothly without excessive friction, sticking or irregular return to centre.

Electrical supply and cockpit installation

The variometer works pneumatically from static pressure, while the turn indicator requires electrical power. Yak-40 installation documentation describes a three-phase 36 V supply for the DA-30 turn section. Exact frequency, tolerances, circuit protection and connector pinout must be confirmed from the offered unit, its passport and the wiring diagram of the particular aircraft.

DA-30 is installed in the pilot instrument panel as part of the flight-instrument and air-data indication arrangement. Installation requires a secure mounting flange, a sealed static-pressure connection, the correct electrical connector and sufficient clearance behind the panel for the cylindrical housing and wiring. Scale lighting and any associated power converter must also be checked against the airframe configuration.

Documented applications and DA-30 identification

Technical and operating documentation records DA-30 installations on the Yak-40, Yak-52, An-28 and selected An-24 configurations. Applicability must still be checked by aircraft modification, equipment list and panel arrangement because different versions may use metric, imperial or modified instruments.

Before ordering, confirm the DA-30 marking, the m/s scale, connector, pressure fitting, mounting pattern and required documentation. Related executions include DA-30P and the imperial-scale DA-30 Feet / DA-30F. Similar external dimensions do not by themselves establish interchangeability. Exact mass, overall dimensions, operating temperature limits and connector pin count for this base execution require confirmation from its own passport.

Product Type: Combined vertical-speed, turn and slip indicator

Designation: DA-30

Alternative Designations: ДА-30; DA 30; ДА 30; combined variometer and turn-slip indicator

Function: Indication of vertical speed, turn direction and relative turn rate, slip or skid

Internal Instruments: Variometer; gyroscopic turn indicator; ball-type slip indicator

Vertical-Speed Range: −30 to +30 m/s

Vertical-Speed Units: Metres per second

Reference Flight Speed for Turn Scale: 400 km/h

Reference Bank Angles: 15°; 30°; 45°

Reference Angular Turn Rates: 1.3°/s; 2.9°/s; 5°/s

Slip Indicator: Mechanical ball inclinometer in a curved transparent tube

Operating Principle: Static-pressure differential for vertical speed; electrically driven gyroscope for turn indication; gravity and lateral acceleration for slip indication

System: Flight-instrument and aircraft static-pressure systems

Pressure Connection: Aircraft static-pressure line

Electrical Supply: Three-phase 36 V supply for the turn section according to Yak-40 installation documentation; exact frequency and tolerances require confirmation

Confirmed Applications: Yak-40; Yak-52; An-28; selected An-24 configurations

Installation Area: Pilot instrument panel

Related Executions: DA-30P; DA-30 Feet / DA-30F

Interchangeability: Not confirmed; scale units, connector, mounting and aircraft documentation must match

Dimensions, Mass, Temperature Limits and Connector Pin Count: Reliable data for the exact base DA-30 execution were not found

Condition: New

Warranty: 6 Months

Stock Status: Pre-Order

Technical Documentation: Product passport, faceplate photograph, aircraft equipment list, wiring diagram and installation documentation when 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.