DA-30 Feet

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

DA-30 Feet is an imperial-scale execution of the DA-30 combined cockpit instrument. It places a vertical-speed indicator, an electrically driven turn indicator and a mechanical slip indicator in one panel-mounted housing. The crew can therefore observe climb or descent, the direction of a turn and the coordination of the manoeuvre without referring to three separate instruments.

The defining feature of this execution is the vertical-speed scale intended for readings in feet per minute rather than metres per second. Russian technical references identify the corresponding version as DA-30F / ДА-30Ф. Because several DA-30 executions use a similar housing and dial layout, the scale units and the exact marking on the faceplate must be checked before supply.

Imperial vertical-speed indication

The variometer section is connected to the aircraft static-pressure system. Static pressure reaches the sensitive element and the instrument case through passages with different response characteristics. During a climb or descent, the temporary pressure difference moves the vertical-speed pointer; after the pressure equalises in level flight, the pointer returns towards zero.

On DA-30 Feet the result is presented on an imperial scale in feet per minute. This makes the instrument suitable for a cockpit configuration based on international or imperial flight units. Reliable public documentation for the exact full-scale range and every graduation of this version was not found. Those values should therefore be confirmed from the offered instrument face, its passport or the applicable airframe documentation rather than copied from a metric DA-30.

Turn and slip information from the DA-30 family

The turn section uses a gyroscopic mechanism to show the direction and relative intensity of aircraft rotation about the vertical axis. It serves as a supporting reference during coordinated turns and can also help the crew recognise a disagreement with other flight instruments. Its operation requires the correct aircraft electrical supply.

A separate curved-tube inclinometer contains a freely moving ball. The ball responds to gravity and lateral acceleration, giving a direct indication of slip or skid. When the ball is centred, the turn is coordinated. These turn-and-slip functions are characteristic of the DA-30 family, but the condition of the gyroscope, bearings, damping, electrical circuit and inclinometer must be checked during inspection or bench testing.

Cockpit installation and system connections

The combined instrument is installed in the pilot instrument panel and requires both a sealed static-pressure connection and an electrical connection for the turn mechanism. DA-30 documentation describes a 36 V supply for the powered section. Exact phase, frequency, tolerance, connector pinout and circuit protection for the DA-30 Feet execution must be verified against the specific unit and aircraft wiring diagram.

The instrument is part of the flight-instrument and air-data indication arrangement rather than an independent navigation computer. A pressure leak can affect the vertical-speed indication, while loss of electrical power affects the gyroscopic turn section. The slip ball remains a mechanical reference. Installation should include checks of the pressure hose, electrical connector, mounting flange, panel clearance and scale visibility.

Yak-40 application and ordering identification

Yak-40 technical documentation lists the combined instrument as DA-30 with the DA-30F execution, confirming application of the feet-scaled version in selected Yak-40 cockpit configurations. This does not mean that every Yak-40 airframe uses the same scale or connector arrangement. Applicability must be checked by aircraft modification, equipment list and installation documentation.

Before ordering, confirm the markings DA-30 Feet, DA-30F or ДА-30Ф, the units printed on the vertical-speed scale, the electrical and pressure connections, the mounting pattern and the required documentation. For the separately documented metric execution, see the internal DA-30P product page. The two executions should not be treated as interchangeable solely because their housings appear similar.

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

Designation: DA-30 Feet

Documented Cyrillic Designation: ДА-30Ф

Alternative Designations: DA-30F; DA 30F; DA 30 Feet; ДА-30 футовый; ДА 30Ф

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

Indication Units: Vertical speed in feet per minute; exact range and scale graduation must be confirmed from the specific instrument

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

System: Flight-instrument and static-pressure systems

Operating Principle: Static-pressure differential for vertical speed; electrically driven gyroscope for turn indication; mechanical inclinometer for slip indication

Confirmed Application: Selected Yak-40 configurations documented with DA-30F execution

Installation Area: Pilot instrument panel

Pressure Connection: Aircraft static-pressure line

Electrical Supply: 36 V for the powered turn section according to DA-30 installation documentation; exact phase, frequency and tolerance require confirmation

Related Execution: DA-30P combined indicator

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

Dimensions, Mass and Connector Pin Count: Reliable data for the exact DA-30 Feet 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

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.