All about Aircraft Instruments, their Installation and Markings

Aircraft flight instruments are one of the most important tools for pilots, allowing them to monitor various flight conditions that are needed for safe and efficient operations. While instruments are advanced and useful devices for flight, they are nothing without a trained pilot to digest their data for the means of flight management. In this blog, we will discuss the various instrument installations and markings that are common to aircraft, allowing you to have a better idea of how readings may be conducted.

To ensure that pilots have easy access to all the information they need for operations, flight instrument panels are installed in the cockpit on the flight deck. Instrument panels are often formed from aluminum alloy, and shock mounts ensure that the gauges, dials, and display panels present are safe from vibration or shock. As many flight instruments and engine instruments rely on electronics, bonding straps are often implemented to establish electrical continuity from the panel to the airframe. For older aircraft, the various gauges and dials are placed on a mounting system in front of the pilot seats in a “T” arrangement. Electronic flight systems are fairly similar, ensuring that display panels are placed in an easily visible area. As instrument orientation may vary, it is important that pilots are well aware of the specifics of the aircraft they are to operate before a flight. For the mounting of systems, engineers will typically use nut-plates, screws, self-locking nut components, and clamps for a robust installation.

As many flight instruments rely on electrical power for their operation, power systems must be in place for their functionality. Even with very traditional mechanical gauges, electricity may be used simply for lighting. While power is provided by the aircraft generator or another source, it is important that current is controlled to meet the power ratings of each instrument. Additionally, sensitive aerospace parts may need to be guarded agaisnt currents exceeding the amount they need as well.

If flight instruments are more traditional, rather than digital, there will often be colored markings present on the various flight instruments to denote operational ranges. While these ranges may vary based on the instrument and what it is used to measure, markings will often denote ranges that are most optimal or ones that should be avoided. As the markings are placed by the original equipment manufacturers, one may refer to the specific operating and maintenance manuals of the aircraft in question. As markings always follow Aircraft Specifications in the Type Certificate Data Sheet, it is crucial that replacement parts are always marked in accordance if needed.

The airspeed indicator is a component that is regularly monitored throughout the duration of a standard flight, and it will often feature a white, green, and yellow arc alongside a blue and red radial line. The white arc refers to the flap operating range, the bottom being the flaps-down stall speed and the top being the maximum airspeed for flaps-down flight. The green arc is for normal operating range, and its top and bottom both indicate varying maximum or minimum values for such ranges. Lastly, the yellow arc is cautionary as it is the structural warning area. For the radial lines, the blue radial line is the best rate-of-climb airspeed for single-engine configurations, while the red radial line is the never-exceed airspeed.

Beyond the airspeed indicator, many flight and engine instruments such as the oil pressure gauge, tachometer, torque indicator, fuel pressure gauge, and cylinder head temperature gauge all utilize a similar marking system for denoting minimum, maximum, and optimal operational ranges. With digital display panels such as are seen with glass cockpits, similar markings may be provided for the various instruments present on the primary flight display. Despite this, the exact representation of each instrument reading may be presented in varying forms depending on the installation, thus pilots should always prepare themselves before conducting operations.

When you are in need of aircraft instrument parts or tools for their installation, look no further than ASAP NSN Parts. ASAP NSN Parts is a leading online distributor of aerospace parts, and we provide unmatched pricing and services for the benefit of our customers. While you explore our various part and manufacturer catalogs, we invite you to take advantage of our RFQ service to receive quotes for your comparisons in just 15 minutes or less upon the submission of a completed form. At ASAP NSN Parts, we are more than just a reliable distributor; we are your strategic sourcing partner.


June 11, 2020

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