Electronic Flight Instrument System (EFIS) Displays
Published March 16, 2016 by SAE International in United States
This SAE Aerospace Standard (AS) specifies minimum performance standards for Electronic Flight Information System (EFIS) displays that are head-down and intended for use in the flight deck by the flight crew in all 14 CFR Part 23, 25, 27, and 29 aircraft. This document is expected to be used by multiple regulatory agencies as the basic requirement for a technical standard order for EFIS displays.
The requirements and recommendations in this document are intended to apply to, but are not limited to, the following types of display functions:
Primary Flight and Primary Navigation displays, including vertical situation and horizontal situation functions.
Displays that provide flight crew alerts, which may include engine instrument, aircraft systems information/control.
Control displays including communication, navigation and system control displays.
Information displays, which may include navigation displays used for situation awareness only, supplemental data, and maintenance and documentation displays.
Display Systems including a Display Unit (display) and a symbol generator.
The display functions herein were based on the display aspects of functions covered by previous TSOs that included an end-to-end system, including sensors.
This document does not address video display terminals or video monitors without the means to generate symbols. The symbol generating function may be contained within the display or may be external to the display unit and part of the display system.
This document is not intended to address the display of single function equipment (e.g., airspeed). Two functions are required as a minimum.
This document does not address the sensors or computational engines (e.g., TAWs computer, navigation computer, or TCAS processor) that transmit their data to the EFIS display.
Functions that are not covered in this document include: Overspeed Warning; Air Traffic Control Radar Beacon System (ATCRBS)/Mode Select (Mode S); Automatic Dependent Surveillance - Broadcast (ADS-B); Traffic Information System - Broadcast (TIS-B); Electronic Map Display; Synthetic Vision; Enhanced Vision; Head-Up Displays (HUD); and Head Worn Displays (HWD).
This document does address the following types of control functions:
Control functions related to the data presented on the EFIS display(s).
Control means that are integrated into the displays.
NOTE: This document is expected to be used for a technical standard order for EFIS displays. This document does not address the hardware, physical, or optical (ocular) requirements of the EFIS displays. Those requirements are addressed in AS8034B. This document is subject to change to keep pace with experience and technical advances.
Many functions often included in an EFIS in existing systems were considered for this MOPS. In general, the functions that were not included here were excluded because it was too complicated to extract and separate the display requirements from the sensor requirements. In other cases, the display requirements in the original MOPS were too extensive to add to this document without essentially replicating the original MOPS. Applicants will need to apply separately for approval for those functions.
Historically, FAA Technical Standard Orders (TSOs) and associated industry Minimum Operational Performance Specifications (MOPS) were developed to address sensor and indicator requirements for single functions, such as airspeed, altitude, or fuel flow. In contrast, modern Electronic Flight Instrument System (EFIS) displays normally present indications for multiple functions, but do not normally include the sensor. Until now, a MOPS did not exist to address the operational/functional requirements for such an EFIS display. Requirements for this type of EFIS typically consist of a few requirements for each function, drawn from many TSOs and associated MOPS. As a result, TSO applications for EFIS displays have multiple deviations to many TSOs and may include incomplete TSO authorizations. This document is intended to facilitate EFIS TSO authorizations by addressing only the EFIS display requirements for a broad set of aircraft functions. This document provides criteria for EFIS displays that are intended for use in the flight deck by the flight crew in aircraft to include, but not limited to, Title 14 CFR Part 23, 25, 27, and 29.
Data Sets - Support Documents
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|Table 1||Airspeed scale error system tolerance|
|Table 2||Vertical speed scale error tolerance|
|Table 3||Cold temperature correction - altitude correction chart|
|Table 4||Scale and hysteresis errors for increasing and decreasing altitude (at ambient room temperature)|
|Table 5||Barometric setting mechanism|
|Table 6||Radio altitude scale error tolerance|
|Table 7||Standard SBAS function labels|
|Table 8||Non-numeric display requirements|
|Table 9||Non-numeric display requirements (modes)|
|Table 10||MLS channels and frequencies|
|Table 11||Frequency channel spacing and channel identification|
|Table 12||Classification by temperature accuracies|
|Table 13||Standard set of visual and aural terrain alerts|
|Table 14||Displayed aircraft symbols (examples)|
|Table 15||Performance required during environmental conditions|
|Table 16||Performance required during environmental conditions|
|Table 17||Performance required during environmental conditions|
|Table B1||Air speed scale error performance over temperature environment|
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