SUBPART A -ENABLING EQUIPMENT SECTION 1 -AUTOMATIC LANDING SYSTEMS (ALSS)
All Weather Operations (CS-AWO) · CS-AWO · AWO.A.ALS.101 – AWO.A.CVS.101
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AWO.A.ALS.101 CS AWO.A.ALS.101 Applicability
- (a) Subpart A Section 1 of this certification specification is applicable to aeroplanes, which are capable of automatic landing carried out in…
AWO.A.ALS.102 CS AWO.A.ALS.102 Safety level
The safety level in automatic landing shall not be lower than that achieved in manual landing.
AWO.A.ALS.103 CS AWO.A.ALS.103 Control actions
EQUIPMENT
AWO.A.ALS.105 CS AWO.A.ALS.105 Automatic speed control
In the absence of failure or extreme conditions, the control actions of the system and the resulting aeroplane flight path shall not contain unusual…
AWO.A.ALS.104 CS AWO.A.ALS.104 Approach speed
The approach speed to be used shall be established taking into account the accuracy with which speed is controlled.
AWO.A.ALS.106 CS AWO.A.ALS.106 Performance demonstration
- (a) The automatic landing system, under the conditions for which its use is to be approved, shall be demonstrated to achieve the performance accuracy…
AMC AWO.A.ALS.106 Performance demonstration
AMC AWO.A.ALS.106 contains additional performance demonstration aspects for HUDLSs.
AWO.A.ALS.107 CS AWO.A.ALS.107 Aerodrome conditions
(See AMC AWO.A.ALS.108) If approval is sought to include automatic landing where the approach is initiated, and the landing made, with an inoperative…
AWO.A.ALS.108 CS AWO.A.ALS.108 Approach and automatic landing with an inoperative engine
Easy Access Rules for All-Weather Operations (CS-AWO) - 5 For the purposes of this requirement, demonstration of automatic landing and go-around…
AWO.A.ALS.109 CS AWO.A.ALS.109 Automatic landing distance
CONTROLS, INDICATORS AND ALERTS
AWO.A.ALS.110 CS AWO.A.ALS.110 Controls, indicators and alerts -General
The controls, indicators and alerts shall be designed to minimise flight crew errors which could create a hazard.
AWO.A.ALS.111 CS AWO.A.ALS.111 General
AEROPLANE FLIGHT MANUAL
AWO.A.ALS.113 CS AWO.A.ALS.113 General
The effects of any failures of, or affecting, the approach and landing system shall be considered in accordance with CS 25.1309 and CS 25.1329.
AWO.A.ALS.112 CS AWO.A.ALS.112 Failure of xLS navigation means (facilities external to the aircraft, including signal-in-space)
ED Decision 2022/007/R The aeroplane flight manual (AFM) shall contain the limitations, procedures and other information pertinent to the operation of…
AWO.A.ALS.114 CS AWO.A.ALS.114 Wind speed limitations
Wind speed limitations higher than those established in showing compliance with CS AWO.A.ALS.106 may be specified in the AFM for decision heights (DHs)…
AWO.A.ALS.115 CS AWO.A.ALS.115 Approach and automatic landing with an inoperative engine
If compliance with CS AWO.A.ALS.108 Approach and automatic landing with an inoperative engine (see AMC AWO.A.ALS.108) is established, a statement shall…
AWO.A.HUD.101 CS AWO.A.HUD.101 Applicability and terminology
- (a) A headup display (HUD) is a display system that presents flight information into the pilot's forward external field of view.
AWO.A.HUD.102 CS AWO.A.HUD.102 Go-around
If a HUD (or equivalent display) is used for approach guidance, it shall provide sufficient information to permit the pilot to initiate and stabilise a…
AWO.A.HUD.103 CS AWO.A.HUD.103 HUD (or equivalent display) information below decision height
(See AMC AWO.A.HUD.103) Information presented on the HUD (or equivalent display) below the decision height (DH) shall not mislead or distract the pilot…
AWO.A.HUD.104 CS AWO.A.HUD.104 Control of take-off roll, flight path and ground roll
- (d) For take-off roll, the HUD (or equivalent display) shall meet the performance requirements of CS AWO.C.TOO.106.
AWO.A.HUD.105 CS AWO.A.HUD.105 Presentation of information to the flight crew
(See AMC AWO.A.ALS.110) - (a) Where a HUD (or equivalent display) is used to display approach guidance, the following shall apply:
AWO.A.HUD.107 CS AWO.A.HUD.107 Performance demonstration
(See AMC AWO.A.HUD.107) - (a) When a HUDLS is used for primary guidance (HUD manual landing), the following additional variables shall be included in the…
AWO.A.HUD.106 CS AWO.A.HUD.106 Flight data recording
Where a HUD (or equivalent display) is installed, a 'HUD in use' parameter and, if applicable, the mode of the HUD operation shall be recorded on the…
AWO.A.HUD.108 CS AWO.A.HUD.108 Fail-operational hybrid landing systems
Where a HUDLS is fitted as part of a hybrid system, its performance does not need to meet the same criteria as the primary system, provided that it:
AWO.A.HUD.109 CS AWO.A.HUD.109 Head-up display landing systems
For HUDLSs that are used for primary guidance (HUD manual landing) during Category III operations (see Subpart B Section 4), the following are required:
AWO.A.HUD.110 CS AWO.A.HUD.110 Head-up displays used for enhanced flight vision systems
- (a) HUDs (or equivalent displays) used to display enhanced flight vision system (EFVS) imagery shall have a field of regard (FOR) that is appropriate…
AWO.A.HUD.111 CS AWO.A.HUD.111 Head-up displays used for synthetic vision guidance systems
A HUD (or equivalent display) used in a synthetic vision guidance system (SVGS) shall:
AWO.A.HUD.112 CS AWO.A.HUD.112 Head-up display landing distance
If there is any feature of the HUD (e.g. flare cue) or the associated procedures intended to support the flare manoeuvre for landing which would result…
AWO.A.HUD.113 CS AWO.A.HUD.113 Flare cue performance
- (a) The use of the flare cue must provide for acceptable performance in all conditions for which it is intended to be used.
AMC1 AWO.A.HUD.113 Criteria for acceptable landing performance using a flare cue
AMC2 AWO.A.HUD.113 Conditions for the demonstration of an acceptable landing with flare cue
AWO.A.HUD.114 CS AWO.A.HUD.114 Assessment of the failure conditions relating to the use of flare cues
An assessment of the effects of failure conditions relating to the use of the flare cue shall be conducted in accordance with CS 25.1309.
AMC AWO.A.HUD.114 Assessment of the failure conditions associated with the use of the flare cue
AWO.A.EFVS.101 CS AWO.A.EFVS.101 General
- (a) An enhanced flight vision system (EFVS) uses an electronic means to provide a real-time display of the forward external scene topography through…
AWO.A.EFVS.102 CS AWO.A.EFVS.102 Enhanced flight vision system designation
- (a) An enhanced flight vision system -approach (EFVS-Approach (EFVS-A)) is a system that has been demonstrated to meet the criteria to be used for…
AWO.A.EFVS.103 CS AWO.A.EFVS.103 Enhanced flight vision system depiction
- (a) The enhanced flight vision system (EFVS) sensor imagery and the following flight symbology shall be presented so that they are aligned with and…
AWO.A.EFVS.104 CS AWO.A.EFVS.104 Enhanced flight vision system display
- (a) The display of the enhanced flight vision system (EFVS) image on the HUD (or equivalent display) shall not hinder or compromise the pilot's ability…
AWO.A.EFVS.105 CS AWO.A.EFVS.105 Head-up display enhanced flight vision system (HUD EFVS) symbology
- (a) In addition to sensor imagery, the flight instrument data that is displayed on the HUD (or equivalent display) shall, as a minimum, include:
AWO.A.EFVS.106 CS AWO.A.EFVS.106 Enhanced flight vision system (EFVS) display controls
- (a) A means of controlling the EFVS display contrast/brightness shall be provided that prevents:
AWO.A.EFVS.107 CS AWO.A.EFVS.107 Enhanced flight vision system (EFVS) safety assessment
- (a) The normal operation of the EFVS shall not adversely affect, or be adversely affected by, other aircraft systems.
AWO.A.EFVS.108 CS AWO.A.EFVS.108 Enhanced flight vision system (EFVS) level of safety
- (a) The safety design goals for airworthiness approval shall be established and shall consider the phase of flight and include the required:
AWO.A.EFVS.109 CS AWO.A.EFVS.109 Enhanced flight vision system (EFVS) performance
- (a) A performance demonstration and evaluation of the enhanced flight vision system (EFVS) shall be performed, and shall include demonstrations of:
AWO.A.EFVS.110 CS AWO.A.EFVS.110 Enhanced flight vision system -landing (EFVS-L) -Landing performance
- (a) The lateral and longitudinal touchdown performance of an EFVS-L system shall be demonstrated and shall be equivalent to or better than that…
AMC1 AWO.A.EFVS.110 EFVS-L landing performance
AMC2 AWO.A.EFVS.110 Acceptable landing performance criteria for EFVS-Ls
AWO.A.EFVS.111 CS AWO.A.EFVS.111 Enhanced flight visual system (EFVS) monitoring, annunciation and alerting
Failure messages EFVS malfunctions detected by the system, and which can adversely affect the normal operation of the EFVS, should be annunciated.
AMC AWO.A.EFVS.111 EFVS monitoring, annunciation and alerting
AWO.A.EFVS.112 CS AWO.A.EFVS.112 Enhanced flight vision system (EFVS) documentation
The demonstrated capability and any specific EFVS limitations shall be included within the relevant AFM section.
AWO.A.SVGS.101 CS AWO.A.SVGS.101 Applicability and terminology
A synthetic vision guidance system (SVGS) is an installed airborne system that comprises the following elements:
AWO.A.SVGS.102 CS AWO.A.SVGS.102 Synthetic vision guidance system (SVGS) scene depiction
The SVGS primary display at each pilot station shall provide:
AWO.A.SVGS.103 CS AWO.A.SVGS.103 Minimum requirements for synthetic vision guidance system (SVGS) flight instrument displays
Pilots operating the aircraft from their normal seated position shall be provided with the following SVGS displays features and characteristics:
AWO.A.SVGS.104 CS AWO.A.SVGS.104 Command guidance
Command guidance cues (flight director) shall meet the required flight technical error performance and accuracy for the intended operation (see CS-AWO…
AWO.A.SVGS.105 CS AWO.A.SVGS.105 Synthetic vision guidance system (SVGS) Use of a head-up display or equivalent display
A HUD (or equivalent display) used in an SVGS shall meet the requirements of Subpart A Section 2 HUD for the intended operation, in particular CS…
AWO.A.SVGS.106 CS AWO.A.SVGS.106 Field of regard (FOR)
The field of regard (FOR) of a HUD (or equivalent display) or a head-down display (HDD) used to display the SVGS depiction shall support the intended…
AWO.A.SVGS.107 CS AWO.A.SVGS.107 Head-down display (HDD) minification
For a SVGS implemented on head-down primary displays, the minification ratio shall be shown to be satisfactory.
AWO.A.SVGS.108 CS AWO.A.SVGS.108 Information provided to the flight crew
Sufficient information shall be provided to the flight crew to enable them to monito r the system's status and the approach operation's progress and…
AWO.A.SVGS.109 CS AWO.A.SVGS.109 Annunciation of the synthetic vision guidance system's (SVGS) mode and status
The flight crew shall be provided with a means to determine the capability of the airborne system elements to accomplish the approach operation prior to…
AWO.A.SVGS.110 CS AWO.A.SVGS.110 Synthetic view guidance system (SVGS) fault detection and alerting
The SVGS shall provide an automatic means to detect hazardously misleading guidance signals and alert the pilot to such signals.
AWO.A.SVGS.111 CS AWO.A.SVGS.111 Flight technical error
The lateral and vertical tracking performance shall be appropriate and comply with the performance requirements for the intended operation (see CS…
AWO.A.SVGS.112 CS AWO.A.SVGS.112 Navigation system error
In order to ensure the required accuracy and integrity of the guidance and the SVGS scene depiction, the navigation system or position error shall be…
AWO.A.SVGS.113 CS AWO.A.SVGS.113 Databases -general
SVGS FLIGHT DISPLAY ELEMENTS
AWO.A.SVGS.114 CS AWO.A.SVGS.114 Minimum display size
SVGS FLIGHT DISPLAY PERFORMANCE
AWO.A.SVGS.116 CS AWO.A.SVGS.116 Latency
For any database such as terrain, runway or obstacle that are used for SVGS scene depiction, a consistent set of data quality requirements (DQRs) shall…
AWO.A.SVGS.115 CS AWO.A.SVGS.115 HUD SVGS -pilot controls
Manual or automatic SVGS scene depiction contrast (if provided) and/or brightness controls shall be effective in dynamically changing background…
AWO.A.SVGS.117 CS AWO.A.SVGS.117 Jitter
The jitter amplitude of the displayed SVGS image shall be less than 0.6 milliradian (mrad).
AWO.A.SVGS.118 CS AWO.A.SVGS.118 Flicker
The SVGS display refresh rate shall preclude both the appearance of unacceptable flicker (brightness variations at a frequency above 0.25 Hz) and any…
AWO.A.SVGS.119 CS AWO.A.SVGS.119 Image artefacts
Undesirable display artefacts and characteristics shall be minimised so that the information is still readable and identifiable under all foreseeable…
AWO.A.SVGS.120 CS AWO.A.SVGS.120 HUD (or equivalent display) processing error
The generation of the SVGS depiction shall not result in a scene display error greater than 5 mrad at the centre of the display, independent of sensor…
AWO.A.SVGS.121 CS AWO.A.SVGS.121 SVGS scene depiction alignment
There shall be no discernible image misalignment caused by lateral, vertical, or longitudinal offset of the computed SVGS reference point from the design…
AWO.A.SVGS.122 CS AWO.A.SVGS.122 Aircraft position monitoring and alerting
The SVGS shall provide a means of monitoring the difference between the intended flight path and the actual flight path.
AWO.A.SVGS.123 CS AWO.A.SVGS.123 Excessive deviation
An alert shall be displayed to the pilot when the lateral and vertical deviation exceeds the acceptable limits from the guidance being followed.
AWO.A.SVGS.124 CS AWO.A.SVGS.124 Annunciation of the system's mode and status
Any detected SVGS malfunction that can adversely affect the normal operation of the SVGS shall be visually annunciated to the flight crew.
AWO.A.SVGS.125 CS AWO.A.SVGS.125 Determination of the missed approach point (MAPt)
The SVGS shall provide a clear and unambiguous means to inform the pilot when they pass through the point/altitude at which the visual external cues…
AWO.A.SVGS.126 CS AWO.A.SVGS.126 Altimetry requirements
The SVGS display shall include a radio altitude display or another system that provides height above terrain with equivalent performance, accuracy…
AWO.A.SVGS.127 CS AWO.A.SVGS.127 Barometric altimeter / air data source
The altitude source used for the SVGS display shall be consistent with that used for the on-board terrain awareness and alerting system on the aircraft…
AWO.A.SVGS.128 CS AWO.A.SVGS.128 Geometric altimetry/GPS data source
If geometric/GPS altimetry is used, it shall display geometric altitude relative to mean sea level (MSL).
AWO.A.SVGS.129 CS AWO.A.SVGS.129 Depiction of terrain and runway of intended landing
The SVGS shall provide a means of integrating the runway and terrain data, and the terrain in the area surrounding the runway shall not be depicted…
AWO.A.SVGS.130 CS AWO.A.SVGS.130 SVGS scene depiction positioning
The SVGS scene depiction positioning sensor shall meet the required positioning performance criteria for the intended operation.
AWO.A.SVGS.131 CS AWO.A.SVGS.131 System safety objectives
The SVGS shall be shown to safely perform its intended function for each operation and phase of flight for which it will be used, and shall comply with…
AWO.A.SVGS.132 CS AWO.A.SVGS.132 Overall system safety design criteria
The SVGS shall be shown to meet the performance and integrity requirements applicable to the intended type of operation (CS-AWO Subpart B Section 2 SA…
AWO.A.SVGS.133 CS AWO.A.SVGS.133 Flight data recorder (FDR)
If a flight data recorder is required to be installed, then the modes of the SVGS operation shall be recorded.
AWO.A.SVGS.134 CS AWO.A.SVGS.134 SVGS documentation
The demonstrated capability and any specific SVGS limitations shall be included within the relevant AFM section.
AWO.A.CVS.101 CS AWO.A.CVS.101 General
- (a) Combined vision systems (CVSs) combine a real-time imaging sensor and a display with a synthetic image generated using a terrain, runway and…
Consolidated from the EASA Easy Access Rules (revision 14 Aug 2026, extracted 17 Aug 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.
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