A-034-4-27

A-034-4-27 pointer indicator for very low altitudes

The A-034-4-27 is a cockpit altitude indicator intended for aircraft operation at very low heights. It displays true height above ground or water in the range from 0 to 120 meters. This is a narrow-range instrument, so its scale is focused on the part of flight where every few meters matter. The indicator is used together with compatible airborne radio altimeter equipment and gives the crew a quick analog reading of actual clearance below the aircraft. It does not measure height by itself; it displays the signal received from the radio-altimeter system.

Low-height scale of the A-034-4-27

The main feature of the A-034-4-27 is its low-altitude scale. The range is divided with higher detail near the ground, where the pilot needs the most precise visual awareness. From 0 to 20 meters, the scale uses 1-meter divisions. From 20 to 50 meters, it uses 2-meter divisions. From 50 to 120 meters, it changes to 5-meter divisions. This layout makes the instrument easier to read during landing, hovering, low-level approach, operation over water, or other profiles where small changes in height can be critical.

Danger height setting on A-034-4-27

The A-034-4-27 includes a danger height setting function. The crew can set the required threshold using the rotary selector on the front of the instrument. When the aircraft descends to or below the selected height, the integrated warning lamp activates. This warning gives the pilot a separate visual cue and reduces the need to constantly compare the pointer position with the scale during a busy phase of flight. For low-altitude operation, such warning logic is useful because reaction time is short and the aircraft may be close to terrain, water, obstacles, or a landing surface.

Fault indication and blinker flag on A-034-4-27

The indicator includes a drop-out blinker flag for invalid or unavailable altitude indication. If the instrument stops receiving usable data, or if the associated radio-altimeter channel becomes unreliable, the blinker appears on the display. This is important because a pointer instrument can otherwise look normal even when the signal behind it is not valid. The blinker gives the crew a clear sign that the displayed altitude should not be trusted until the system is checked. In maintenance, this indication helps separate normal operation from loss of signal or instrument failure.

TEST function of the A-034-4-27 indicator

A front-panel TEST button allows the crew or maintenance personnel to verify the operation of the indicator and related signal path. Under normal system conditions, pressing TEST moves the pointer to the reference control mark. If the pointer does not respond, or if the system does not confirm valid operation, the drop-out blinker engages. This check is useful before flight and during troubleshooting because it gives a fast indication of whether the display channel reacts as expected. A failed TEST response should be followed by system-level diagnostics, not only replacement of the cockpit instrument.

Installation and system integration of A-034-4-27

The A-034-4-27 is mounted on the cockpit instrument panel and works as part of the aircraft radio-altimeter indication equipment. Since the instrument is a display unit, its operation depends on the associated avionics, wiring, power supply and radio-altimeter signal path. The indicator should be selected by exact designation and scale range, because similar pointer indicators may differ in measurement range, scale layout, warning functions, markings and compatibility. Before installation, the unit should be checked against the aircraft equipment list and the documentation of the installed radio altimeter.

Supply and identification of A-034-4-27

For supply or replacement, the full designation A-034-4-27 should be used. Additional descriptions such as A034-4-27, 120 m low-altitude indicator or pointer-type height indicator can help clarify the item, but the exact designation remains the main identifier. It is also worth specifying the required condition: new, from storage, repaired, overhauled or serviceable with documents. Before acceptance, the indicator should be checked for scale condition, pointer movement, TEST response, blinker operation, warning lamp function, connector condition, mounting integrity and availability of passport or maintenance documentation.

Product Name: Altitude Indicator
Designation: A-034-4-27
Product Type: Pointer-type altitude display
Function: Indication of true aircraft height above ground or water
Application / Where Used: Very low-altitude flight operations; radio altimeter indication systems
Altitude Measurement Range: 0–120 m
Scale Division 0–20 m: 1 m
Scale Division 20–50 m: 2 m
Scale Division 50–120 m: 5 m
Danger Height Setting: Rotary selector
Danger Warning: Integrated lamp indicator
Fault Indication: Drop-out blinker flag
Test Function: Front-panel TEST button
Display Method: Analog pointer
Installation Location: Cockpit instrument panel
Power Supply: Supplied through associated avionics / radio-altimeter system
Construction: Rugged aviation-grade, vibration-resistant cockpit instrument
Condition: As applicable
Alternate Designations: A-034-4-27; A034-4-27; 120 m low-altitude indicator; pointer-type height indicator
Documentation: Passport and maintenance data available on request

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