--- title: "AWO.B.CATIII.102 – AWO.B.RRVR.101: SUBPART B -APPROACH AND LANDING SECTION 4 -AIRWORTHINESS CERTIFICATION OF AEROPLANES FOR OPERATIONS WITH DECISION HEIGHTS (DHs) BELOW 30 M (100 FT) OR NO DECISION HEIGHT (DH) -CATEGORY III (CAT III) OPERATIONS (CS-AWO) — rule index · Avioverse" description: "AWO.B.CATIII.102 – AWO.B.RRVR.101, CS-AWO. The safety level for precision approaches with DHs below 30 m (100 ft) or no DH may not be less than the…" url: "https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4" --- # SUBPART B -APPROACH AND LANDING SECTION 4 -AIRWORTHINESS CERTIFICATION OF AEROPLANES FOR OPERATIONS WITH DECISION HEIGHTS (DHs) BELOW 30 M (100 FT) OR NO DECISION HEIGHT (DH) -CATEGORY III (CAT III) OPERATIONS All Weather Operations (CS-AWO) · CS-AWO · AWO.B.CATIII.102 – AWO.B.RRVR.101 On this page 1. ## [AWO.B.CATIII.102 CS AWO.B.CATIII.102 Safety level](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-102) The safety level for precision approaches with DHs below 30 m (100 ft) or no DH may not be less than the average safety level achieved in precision… [AMC AWO.B.CATIII.102 Safety level](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-102#amc-awo-b-catiii-102-safety-level) 2. ## [AWO.B.CATIII.103 CS AWO.B.CATIII.103 Go-around rate](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-103) The go-around rate below 150 m (500 ft) attributable to the landing system performance or reliability shall not be greater than 5 %. 3. ## [AWO.B.CATIII.104 CS AWO.B.CATIII.104 Minimum flight crew](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-104) The workload associated with the use of the minimum DH shall be considered in showing compliance with CS 25.1523, AMC 25.1523, and CS-25 Appendix D. 4. ## [AWO.B.CATIII.105 CS AWO.B.CATIII.105 Control of flight path and ground roll](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-105) \- (a) Landing systems, other than HUDLS, shall control the aeroplane within the prescribed limits along the flight path to touchdown (see CS… 5. ## [AWO.B.CATIII.106 CS AWO.B.CATIII.106 Control of speed](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-106) Automatic speed control shall be provided unless: - (a) the DH is 15 m (50 ft) or greater; 6. ## [AWO.B.CATIII.107 CS AWO.B.CATIII.107 Manual control](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-107) ED Decision 2022/007/R The transition from an automatic mode to manual mode or the use of a manual mode shall not require exceptional piloting skill… 7. ## [AWO.B.CATIII.108 CS AWO.B.CATIII.108 Oscillations and deviations](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-108) The landing system shall not cause sustained nuisance oscillations or undue attitude changes or control activity as a result of configuration or power… 8. ## [AWO.B.CATIII.109 CS AWO.B.CATIII.109 Alert height](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-109) (See AMC AWO.B.CATIII.109) For a fail-operational system with a DH below 15 m (50 ft) or with no DH, an alert height shall be established in accordance… [AMC AWO.B.CATIII.109 Alert height](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-109#amc-awo-b-catiii-109-alert-height) 9. ## [AWO.B.CATIII.110 CS AWO.B.CATIII.110 Decision height](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-110) ED Decision 2022/007/R ED Decision 2022/007/R When the DH is during the landing flare, it shall be below the height at which the major attitude changes… 10. ## [AWO.B.CATIII.111 CS AWO.B.CATIII.111 Decision height recognition](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-111) The recognition of the DH shall be made by means of height measured by a radio altimeter (or other device capable of providing for equivalent performance… 11. ## [AWO.B.CATIII.112 CS AWO.B.CATIII.112 Go-around](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-112) (See AMC AWO.B.CATIII.112) - (a) The aircraft shall be capable of safely executing a go-around from any point on the approach to touchdown in all… [AMC AWO.B.CATIII.112 Go-around](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-112#amc-awo-b-catiii-112-go-around) 12. ## [AWO.B.CATIII.113 CS AWO.B.CATIII.113 Installed equipment](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-113) (See AMC AWO.B.CATIII.113) The following items of equipment shall be installed for certification to the DHs specified unless it is shown that the… [AMC AWO.B.CATIII.113 Installed equipment](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-113#amc-awo-b-catiii-113-installed-equipment) 13. ## [AWO.B.CATIII.114 CS AWO.B.CATIII.114 Minimum equipment](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-114) PERFORMANCE 14. ## [AWO.B.CATIII.115 CS AWO.B.CATIII.115 Performance demonstration](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-115) (See AMC AWO.B.CATIII.115) - (a) Flight path and speed control shall comply with CS AWO.B.CATII.113 and CS AWO.B.CATII.116. [AMC AWO.B.CATIII.115 Performance demonstrations](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-115#amc-awo-b-catiii-115-performance-demonstrations) 15. ## [AWO.B.CATIII.116 CS AWO.B.CATIII.116 Head-up display fail-operational hybrid landing system](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-116) Where a HUDLS is fitted as part of a hybrid system, its performance need not meet the same criteria as the primary system provided that it: 16. ## [AWO.B.CATIII.117 CS AWO.B.CATIII.117 Automatic ground-roll control](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-117) (See AMC AWO.B.CATIII.115) - (a) When automatic ground-roll control or head-up ground-roll guidance is being used, the probability that the point on the… 17. ## [AWO.B.CATIII.118 CS AWO.B.CATIII.118 Landing distance](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-118) ED Decision 2022/007/R If there is any feature of the system or the associated procedures which would result in an increase in the landing distance, the… [AMC AWO.B.CATIII.118 Landing distance](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-118#amc-awo-b-catiii-118-landing-distance) 18. ## [AWO.B.CATIII.119 CS AWO.B.CATIII.119 Mode selection and switching](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-119) The system shall be designed so that no manual selections or changes of switch settings need be made below a height of 150 m (500 ft) in normal… 19. ## [AWO.B.CATIII.120 CS AWO.B.CATIII.120 Indications and alerts](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-120) (See AMC1 AWO.B.CATIII.121 and AMC AWO.A.ALS.110) - (a) The display of information to the flight crew, including that required to monitor the approach… 20. ## [AWO.B.CATIII.121 CS AWO.B.CATIII.121 General](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-121) (See CS 25.1309 and its AMC, and AMC1 AWO.B.CATIII.121 and AMC2 AWO.B.CATIII.121) - (a) The effects of failures of the flight guidance system including… [AMC2 AWO.B.CATIII.121 Flight crew and maintenance checks](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-121#amc2-awo-b-catiii-121-flight-crew-and-maintenance-checks) [AMC1 AWO.B.CATIII.121 Flight demonstrations of failure conditions](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-121#amc1-awo-b-catiii-121-flight-demonstrations-of-failure-conditions) 21. ## [AWO.B.CATIII.122 CS AWO.B.CATIII.122 Fail-passive automatic landing system (including super fail-passive system)](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-122) (See AMC1 AWO.B.CATIII.122(a) and AMC2 AWO.B.CATIII.122(a)) - (a) For a fail-passive automatic landing system, failure conditions resulting in the loss… 22. ## [AWO.B.CATIII.123 CS AWO.B.CATIII.123 Fail-operational landing system (automatic or hybrid)](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-123) (See AMC2 AWO.B.CATIII.121) - (a) For a fail-operational landing system, the probability of total loss of the landing system below the alert height shall… [AMC AWO.B.CATIII.123 Safety of the manual landing and go-around manoeuvres following a loss of the automatic control capability for fail-operational landing systems (automatic or hybrid)](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-123#amc-awo-b-catiii-123-safety-of-the-manual-landing-and-go-around-manoeuvres) 23. ## [AWO.B.CATIII.124 CS AWO.B.CATIII.124 Head-up display (or other form of guidance display) fail-operational hybrid landing system](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-124) (See AMC1 AWO.B.CATIII.121 and AMC2 AWO.B.CATIII.121) Where a HUDLS is fitted for use in the event of automatic landing system failure, the combination… 24. ## [AWO.B.CATIII.125 CS AWO.B.CATIII.125 Nose-wheel steering](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-125) (See AMC1 AWO.B.CATIII.121 and AMC2 AWO.B.CATIII.121) In showing that the nose-wheel steering system complies with CS 25.745(c), account shall be taken… 25. ## [AWO.B.CATIII.126 CS AWO.B.CATIII.126 Automatic go-around](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-126) ED Decision 2022/007/R Total failure (shutdown) of the xLS facility shall not result in a loss of the automatic go-around capability. 26. ## [AWO.B.CATIII.127 CS AWO.B.CATIII.127 General](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-127) (See AMC AWO.B.CATIII.127(a)) The AFM shall state the following: 27. ## [AWO.B.CATIII.128 CS AWO.B.CATIII.128 Documentation required](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-catiii-128) Documentation providing the following information is required for certification: 28. ## [AWO.B.RRVR.101 CS AWO.B.RRVR.101 Applicability](https://avioverse.aero/regulations/easa/cs-awo/subpart-b-section-4/awo-b-rrvr-101) An aeroplane shall be considered to be eligible for operational credit if it has been demonstrated that the aeroplane complies with Subpart A Section 3… Consolidated from the EASA Easy Access Rules (revision 14 Aug 2026, extracted 13 Oct 2026) for convenience. 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