头戴式显示器（HWD）可以显示各种信息，从完整的主要飞行信息（PFI），包括增强的、合成的或组合的视觉系统图像，到空速、高度或航向的简单表示，再到可能与飞机性能或控制无关的特定作战信息。本ARP中讨论的显示功能仅限于与飞机控制和管理以及PFI演示相关的预期功能。本文件中提供的材料包括与普通、实用、杂技、通勤、，运输类飞机和特种飞机。 该内容针对提供导航、控制和主要飞行指导信息（包括地形和避障）的HWD。文件内容仅限于一般设计和安装注意事项的说明，包括显示功能关键性和合规性注意事项；符号学、编码、混乱、维度和引人注目的需求；设备安装；显示视觉特征；故障模式；信息显示和格式化；具体的集成显示和模式；以及系统验证。本文件涉及单个HWD的安装，以及与双HWD（每个飞行员一个）或包含HWD和HUD的配置相关的特殊注意事项。 该指南还可适用于拟用作补充显示器的HWD，其中HWD包含其他预期功能所需的最低信息。如果这些类型的HWD不显示地球或飞机参考的符号或信息（例如，姿态、飞行路径引导、图像等），则它们可能不具有头部跟踪功能。HWD还可用于显示增强和合成视觉视频图像。虽然本文件确实包括在HWD上显示视频图像的指南，但本文件的范围并不涉及提供这些图像的系统的要求。 由于其对操作和性能特性的影响，本文件在很大程度上依赖于HWD人类工程方面的考虑。本文件试图独立于候选技术；然而，在特定技术的性能特征相关的情况下，将对其进行识别，在性能标准与特定预期功能/用途相关的情况中，将对它们进行识别。

Head worn displays (HWD) can display a variety of information ranging from a full complement of primary flight information (PFI), including enhanced, synthetic, or combined vision system imagery to simple representations of airspeed, altitude, or heading to operationally specific information that may not be related aircraft performance or control. The display functions discussed in this ARP are limited to intended functions related to aircraft control and management and the presentation of PFI.The material provided in this document consists of recommendations related to the design, analysis, testing, and intended functions of head worn displays (HWDs) for normal, utility, acrobatic, commuter, and transport category aircraft and special classes of aircraft. The content is targeted to HWDs that provide navigation, control and primary flight guidance information including terrain and obstacle avoidance. The content of the document is limited to statements of general design and installation considerations, including display function criticality and compliance considerations; symbology, coding, clutter, dimensionality, and attention getting requirements; equipment installation; display visual characteristics; failure modes; information display and formatting; specific integrated display and mode; and system verification. This document addresses both the installation of a single HWD, as well as special considerations related to dual HWDs, one for each pilot, or configurations incorporating a HWD and a HUD.The guidance may also apply to HWDs that are intended to be used as a supplemental display in which the HWD contains the minimum information immediately required for other intended functions. These types of HWDs may not have a head tracking function if they are not displaying earth- or aircraft-referenced symbols or information (e.g., attitude, flight path guidance, imagery, etc.).A HWD may also be used to display enhanced and synthetic vision video images. While this document does include guidance for the display of a video image on a HWD, the scope of this document does not address the requirements for the systems that provide those images.Due to their impact on operational and performance characteristics, this document relies heavily on HWD human engineering considerations. This document attempts to be independent of candidate technologies; however, where the performance characteristics of specific technologies are relevant, they will be identified, and where performance criteria are relevant to specific intended functions/use they will be identified.