In aviation, time and some other indicators are measured using aviation watches, chronometers, stop watches, which operate on the principle of mechanical oscillations of a pendulum. The mechanism of such devices is driven by the consumption of a certain supply of mechanical energy contained in the spring. Popular options that are installed on airplanes are the ASF-1 clock, which includes a conventional time chronometer, a stopwatch and a flight period accounting mechanism.
Application
The considered modifications are intended for the following purposes:
- Displays the current time (hours / minutes / seconds).
- For separate fixation in hours and minutes (modifications ASF-1M, ASF-1MN).
- The flight time of the flight of an airplane, helicopter or other aircraft is counted.
- Keep track of small time intervals in minutes and seconds.
The stopwatch scale on the ASF-1 model is designed for 60 minutes, on the ASF-1M and MN variations for 30 minutes. The second hand is located in the center, simultaneously acts as a stopwatch and works in this mode only if the stopwatch is on.
The usual daily indicator functions non-stop, and the device that determines the flight time and the stopwatch have separate controls. On the front of the device are scales (3 pcs.) And knob heads (2 pcs.).
The purpose of the left handle
The left head, which the aviation watch is equipped with, performs several functions:
- Serves for winding.
- Designed to move the arrows of the main daily element.
- Used for running start and deactivation of the flight time mechanism.
The maximum spring plant guarantees operation for 72 hours. In order to achieve optimum accuracy, it is advisable to start the device every two days. The temporary flight mechanism is controlled by pressing the handle on the left, during the first action it is activated, a red color forms in the signal gap.
Pressing the crown again turns off flight time. The arrows fix the aircraft in the air, the scale indicates this in red and white. The next (third) press returns the arrows to their original position (“12”), a white color is displayed in the signal niche.
What is the right head for?
With the right handle, the aviation clock with a stopwatch is adjusted when starting and stopping the daily mechanism, stopwatch, and also to return the minute and second hands to the starting position.
The cycling of the stopwatch goes through a full stage by three taps. At the first touch, the stopwatch mechanism is activated. A second press stops it, and a third press returns the arrows to their original position.
Features
Aviation watches are equipped with electric heating with a temperature regulator that maintains the temperature regime within 20 degrees. The element is connected to the on-board network with direct current. Recommended switch-on temperature is below five degrees. Before the start of the flight, you should check the watch factory, set the exact time indicator on them.
To do this, when overcoming the “12” second hand, it is necessary to turn the crown clockwise to the right, stopping the move. Next, you need to remove the left handle all the way, rotating it in a circle from right to left, set the exact time. After setting the current parameters is made, the left head is returned to its original position. To start the clock, turn the right knob from left to right.
After permission to take off is obtained, the flight time mechanism should be activated, and after landing, turn it off by pressing the left handle.
Technical indicators
Aviation mechanical watches (ASF) have the following characteristics:
- The dial and hands are coated with white paint or reflective mass.
- Accuracy of accuracy per day - ± 20 sec.
- The duration of a complete movement of the mechanism is 72 hours.
- The recommended winding frequency is every two days.
- The voltage of the heating circuit (DC) is 27 V.
- Electric heating resistance - 50 Ohms.
- The power supply of the built-in backlight is 5.5 V from a 400 Hz network.
- The weight of the device is 650-750 grams, depending on the model.
- Overall dimensions of ASF-1 - 85 * 91.4 mm.
Item Description
An aircraft flight clock consists of a kind of engine (clockwork springs), devices responsible for the current time, a stopwatch, flight period, stroke, as well as a regulator, controls and electric heating with a temperature controller, built-in backlight (AChS-1MN).
The current time device works non-stop from the engine, and the flight time and stopwatch turn on and off automatically. To view the readings, the dial with scales (3 pcs.) Is intended:
- For the current time, the main (large) scale.
- Sector "Flight Time" - for fixing flight time.
- Sector "SEC" - for counting the functions of a stopwatch.
The watch is controlled by two heads (knobs).
Wrist modification
The Molniya plant in Chelyabinsk produces a unique project - an aviation wristwatch, which is an exact copy of the ASF device. The dial of the compact model fully copies the design of the original aviation watch, equipped with appropriate scales, which make it possible to measure time intervals in hours, minutes and seconds.
The material for the watch case is stainless steel. The new line has developed two modifications: with a special black PVD coating and without coating. On the back cover you can put an individual image, a commemorative inscription, a wish, using the engraving method.
Such an original gift will delight any person associated with aviation or simply a connoisseur of quality things. The wrist variant most closely resembles an aviation watch, which is mounted on almost all types of domestic aircraft.
Conclusion
Concluding the review of aviation watches, it can be noted that this is a reliable, unpretentious device that provides maximum accuracy of the current time, flight parameters, which has a stopwatch function. Due to the high quality indicators, the device in question and its modifications have been used in aviation for many years.
A flight watch with a stopwatch does not require special care, one winding is enough for three days, and electric heating ensures their normal operation at any temperature of the outside air. On the Internet you can find many ads on the sale / purchase of ASF models, while their price is quite high. Additionally, the quality of the device and their popularity is confirmed by the wrist copy, which is in great demand and exactly repeats the design and design of the onboard variation.