"This SAE Aerospace Standard (AS)/Minimum Operational Performance Specification (MOPS) specifies the minimum performance requirements of Ground Ice Detection Systems (GIDS). These systems may be mounted onboard the airplane@ or be ground-based. They may provide information for indication and/or control. Chapter 1 provides information required to understand the need for the GIDS characteristics and tests defined in the remaining chapters. It describes typical GIDS applications and operational objectives and is the basis for the performance criteria stated in Chapter 3 through Chapter 5. Definitions essential to the proper understanding of this document are provided in Chapter 1. Chapter 3 contains general design requirements for an ice detection system used during ground operations. Chapter 4 contains the Minimum Operational Performance Requirements for the GIDS@ defining performance under icing conditions likely to be encountered during ground operations. Chapter 5 describes environmental test conditions providing laboratory means of testing the overall performance characteristics of the GIDS under conditions which may be encountered in actual operations. Chapter 6 describes recommended test procedures for demonstrating compliance with Chapters 3 and 4. Chapter 7 contains the Minimum Operational Performance Requirements for installed GIDS. Ground and flight tests are included when performance cannot be adequately determined through testing under standard test conditions. Applications of This Document: Compliance with this AS/MOPS ensures that the GIDS will satisfactorily perform its intended functions as given by 1.2 during airplane ground operations. Compliance with this AS/MOPS does not necessarily constitute compliance with regulatory requirements. Any regulatory application of this document in whole or in part is the sole responsibility of the appropriate government agencies. The measured values of the GIDS performance characteristics may be a function of the method of measurement. Therefore@ standard test conditions and methods of testing are recommended in this document. Mandating and Recommendation Phrases: a. ""Shall"" The use of the word ""Shall"" indicates a mandated criterion; i.e.@ compliance with the particular procedure or specification is mandatory and no alternative may be applied. b. ""Should"" The use of the word ""Should"" (and phrases such as ""It is recommended that...""@ etc.) indicates that although the procedure or criterion is regarded as the preferred option@ alternative procedures@ specifications or criteria may be applied@ provided that the manufacturer@ installer or tester can provide information or data to adequately support and justify the alternative. Functional Description of System: GIDS are intended to be used during airplane ground operations to inform the ground crew and/or the flight crew and/or a relevant system about the condition of monitored airplane surfaces. The GIDS may provide a complementary or@ when approved@ a functional alternative to the visual and tactile checks required by regulatory agencies@ including the European Joint Aviation Authorities (JAA)@ the United States Federal Aviation Administration (FAA) and Transport Canada Civil Aviation (TCCA)@ to determine the condition of airplane critical surfaces under operating conditions involving freezing contamination. A PRIMARY GIDS can be used as the sole means of compliance with the operating rules applicable to airplane ground icing conditions@ including pre-deicing check@ post-deicing check and/or any applicable regulatory pre-take-off checks. An ADVISORY GIDS@ combined with other means@ provides information for compliance with the operating rules applicable to airplane ground icing conditions. The GIDS function is: FROZEN CONTAMINATION DETECTION; which is to detect frozen contaminants (ice@ frost@ snow and/or slush) on airplane surfaces. and/or FLUID CONDITION MONITORING; which is to monitor and indicate de/anti-icing fluid conditions. Onboard GIDS: Airplane mounted systems are designated as ONBOARD GIDS. and include the following two sub-categories: IN SITU: GIDS that make a direct measurement on a monitored surface (flush mounted sensors). REMOTE: GIDS that make a remote measurement of a monitored surface (e.g.@ optical camera methods). Possible technologies include@ but are not limited to@ latent heat of fusion@ vibrating elements@ visual cues@ ultrasonic sensors@ visible or IR cameras@ other optical methods@ etc. The ONBOARD GIDS may be: Spot sensors (area of coverage per sensor <40 cm?@ [6.2 in?]) Local area sensors. (40 cm? [6.2 in?] < area of coverage per sensor <5m? [53.8 ft?]) Wide area sensors. (area of coverage per sensor ?? m? [53.8 ft?]) Ground-Based GIDS: Ground-based@ hand held@ pedestal or truck mounted systems are designated as GROUND-BASED GIDS and include only the following sub-category: REMOTE: GIDS that make a remote measurement on a monitored surface (e.g.@ optical camera methods). Possible technologies include@ but are not limited to@ visible or IR cameras@ other optical methods@ etc. The GROUND-BASED GIDS may be: Spot sensors (area of coverage per sensor <40 cm?@ [6.2 in?]) Local area sensors. (40 cm? [6.2 in?] < area of coverage per sensor <5 m? [53.8 ft?]) Wide area sensors. (area of coverage per sensor >5 m? [53.8 ft?]) Composition of a GIDS: GIDS include: At least one sensor which is directly or indirectly sensitive to the physical phenomena of icing and/or de/anti-icing fluid condition and which may be exposed to weather conditions as given in 3.8.6. A processing unit to perform signal processing. The unit may either be integrated with or separate from the sensor(s). A device to provide information to the flight and/or ground crew."