ACHS-1k

AChS-1K aircraft clock for cockpit installation

The AChS-1K is a mechanical aircraft clock used in cockpit instrument panels of aircraft and helicopters of Soviet and Russian origin. It provides the crew with a clear time reference and allows measurement of elapsed time during flight operations. The clock is a self-contained mechanical instrument, but it also uses aircraft electrical power for heater operation and cockpit illumination. The red illumination version is intended for night and low-light cockpit environments, where readability must be maintained without excessive glare.

Timekeeping and elapsed-time function of AChS-1K

The AChS-1K combines a current-time display with an elapsed-time measurement function. This makes it useful not only as a clock, but also as a flight operation instrument for timing route segments, mission phases, engine operation intervals, navigation checks or other cockpit procedures. Since many aircraft checklists and flight tasks depend on time control, the clock remains a practical part of the instrument panel even when other navigation systems are installed. Its mechanical design also gives a time reference independent of many onboard electronic systems.

Red illumination version of AChS-1K

The red illumination version of the AChS-1K is used where cockpit lighting must support night operation. Red lighting helps the crew read the dial in low-light conditions while reducing unwanted light intensity in the cockpit. For aircraft operated at night or in instrument conditions, the readability of small cockpit instruments is important. The clock must remain easy to see, but it should not create distracting reflections or interfere with the pilot’s adaptation to darkness. This makes the red-illumination version suitable for transport, utility and helicopter cockpit layouts.

Mechanical movement and power reserve

The AChS-1K uses a precision mechanical movement with an elapsed-time counter. The mechanism has a multi-day power reserve from one full winding, with a recommended winding interval during regular operation. The movement uses jeweled bearings to reduce friction and support stable long-term operation. Even though the instrument includes electrical heater supply, the timekeeping function itself is mechanical. This is one of the reasons why AChS-series clocks have been widely used in aircraft cockpits: the unit is compact, independent and practical for continuous cockpit service.

Aircraft operation and environmental suitability

The AChS-1K is built for aircraft operating conditions, including vibration, temperature variation and cockpit environmental loads. It is suitable for transport aircraft, utility aircraft and helicopters where a panel-mounted mechanical clock with elapsed-time function is required. During inspection, attention is usually given to the case, dial, hands, winding crown, elapsed-time controls, glass, illumination, mounting points and heater circuit. A clock may look clean externally, but its daily rate, reserve, counter operation and illumination should still be checked before installation.

Installation and compatibility of AChS-1K

The clock is installed on the cockpit instrument panel using a panel-mounted arrangement. It is commonly associated with aircraft and helicopters of Soviet and Russian design, but the exact suitability depends on the aircraft cockpit layout, power supply, lighting system and documentation. The AChS-1K may also be referenced under the broader AChS-1 designation in some requests or spare-parts lists. Before replacement, the required illumination type, condition, documentation and aircraft installation requirements should be confirmed.

Supply, condition and documentation

The AChS-1K may be supplied as new, overhauled or serviceable depending on availability. For aviation use, the technical condition and documentation are important. Test report, Form 1, certificate, passport or other acceptance documentation may be supplied depending on batch and customer requirement. Standard warranty is available, with extended warranty possible by agreement. For international supply, individual export packing, inspection, professional packaging and export documentation can be arranged according to the delivery terms.

Category: Aircraft instruments
Product Type: Mechanical aircraft clock with elapsed-time function
Product Name: AChS-1K Aircraft Clock with Red Illumination
Alternative Reference: AChS-1
Function: Display of current time and measurement of elapsed flight time
Application / Where Used: Aircraft and helicopters of Soviet and Russian origin
Associated Systems: Onboard instrumentation system; cockpit lighting system
Installation Location: Cockpit instrument panel
Construction: Mechanical clock mechanism with integrated elapsed-time counter and red illumination
Mounting: Panel-mounted installation
Daily Rate Accuracy: ±20 seconds per day under normal climatic conditions
Power Reserve: Not less than 3 days from one full winding
Recommended Winding Interval: Once every two days
Heater Supply Voltage: 27 V ±2.7 V DC
Number of Jewels: 25
Balance Oscillation Period: 0.4 s
Overall Dimensions: 85 × 91.4 × 91.4 mm
Weight: Not more than 655 g
Operating Conditions: +20 ±5 °C; relative humidity 65 ±15% under normal climatic conditions
Condition: New / overhauled / serviceable
Documentation: Test report / Form 1 / certificate on request
Warranty: 6 months standard; extended warranty available
Country of Origin: Depending on production batch
Packaging: Individual export packing
Logistics: Worldwide shipping, export documentation, inspection and professional packing available

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In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.

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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.