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NAV11 — Implement precision approach procedures using GBAS CAT II/III based on GPS L1

Note: The benefits mentioned are obviously only gained if a sufficient number of aircraft are equipped; therefore, an action should be included to promote airborne equipage, monitor aircraft equipage rate and assess incentives.

NOTE FOR MILITARY AUTHORITIES: It is the responsibility of each Military Authority to review this Objective IN ITS ENTIRETY and address each of the SLoAs that the Military Authority considers RELEVANT for itself. This has to be done on top and above of the review of "MIL" SLoAs which identify actions EXCLUSIVE to MIL Authorities.

Regulator / Air Navigation Service Provider / Airspace Users / International Organisations and Regional Bodies / Aeronautics Industry


Related Elements

Applicability Area(s) and Timescales

Subject to local need.:
(Subject to local need.)
Timescales From By Applicable to
Subject to local need. 31-05-2019

Links to SESAR Solutions

Links to PCP ATM Sub-Functionalities

ICAO Block Modules: No associated data


Applicable legislation
Applicable ICAO Annexes and other references
Deployment Programme 2019
Operating Environments
Terminal Airspace

Expected Performance Benefits

Safety of approach, landing and guided-take-off operations based on GBAS CAT III L1 (GAST-D) are as safe as operations based on ILS CAT III assuming the identified safety requirements are met. GBAS improves safety in the segment of avoiding a scenario of false LOC or Glide beam capture.
GBAS has limited (GBAS Local Object Consideration Areas) or no protection areas, usually located outside aircraft movement areas. This allows the reduction of runway occupancy times in low visibility conditions resulting in reduced spacing between arrival aircraft. The amount of runway throughput gained depends on wake turbulence separation and any other additional spacing needs.
Operational efficiency
Fewer flights will be cancelled or diverted saving the Airspace User (Main and Regional airliners) associated costs. To be noted that cancellations also affect the subsequent legs planned with those aircraft. Business Aviation see minimal benefits as they fly infrequently to capacity constrained airports during LVP. Avoiding the loss of runway capacity will reduce the level of delay and avoid the associated costs. A key issue is the impact of the primary delays on the subsequent legs to be performed by those aircraft which try to absorb the delay where possible. Higher glide slopes than those possible with ILS, 3.2° even in CAT II/III weather conditions.
Cost efficiency
One GBAS station can provide approaches for multiple runway end as well as multiple approaches per runway end. The GBAS station in the long term is much more cost efficient than the ILS in terms of less maintenance and flight inspection required.
The environmental benefits come from the saving of jet fuel due to the resilience of the system in keeping its capacity even in Low Visibility Operations. Fuel savings results in direct reductions in CO2 emissions. There is also a direct benefit in term of local air quality by having less aircraft queuing on the runway for departure conditions. Noise abatement.
Not identified.
  Code Title From By Related Enablers
REG01 Apply EASA material to local national regulatory activities
ASP01 Install GBAS CAT II/III ground equipment
ASP02 Design and Publish GBAS CAT II/III precision approach procedures
USE01 Equip aircraft with systems approved for GBAS CAT II/III
USE02 Get airworthiness certification and operational approval
INT01 Develop material for certification of GBAS ground facilities
IND01 Get certification for GBAS CAT II/III ground equipment
Code Dates
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Supporting Material

Title Related SLoAs

ICAO - Annex 10 - Aeronautical Telecommunications


ICAO - Doc 8168-Volume II - Aircraft Operations - Volume II - Construction of Visual and Instrument Flight Procedures - Edition 5 / 11/2011


ICAO - Eur-Doc 013 - Guidance Material on All Weather Operations at Aerodromes

ASP01, ASP02

SJU - SESAR Solution 55: Data pack for Precision approaches using GBAS CAT II/III based on GPS L1

ASP01, ASP02, INT01, REG01, USE01, USE02

Consultation & Approval

Working Arrangement in charge
Outline description approved in
Latest objective review at expert level
Commitment Decision Body
Provisional Council (PC)
Objective approved/endorsed in
Latest change to objective approved/endorsed in