GM3 ATS.TR.155(c)(9) ATS
surveillance services
ED Decision 2020/008/R
MINIMUM SAFE ALTITUDE WARNING (MSAW) PROCEDURES
The generation of MSAWs is a function of an ATS surveillance data-processing system. The objective of the MSAW function is to assist in the prevention of controlled flight into terrain accidents by generating, in a timely manner, a warning of the possible infringement of a minimum safe altitude. Procedures and related instructions concerning the use of the MSAW function should specify, inter alia:
(a) the types of flight which are eligible for generation of MSAW;
(b) the sectors or areas of airspace for which MSAW minimum safe altitudes have been defined and within which the MSAW function is implemented;
(c) the values of the defined MSAW minimum safe altitudes;
(d) the method of displaying the MSAW to the air traffic controller;
(e) the parameters for generation of a MSAW as well as warning time; and
(f) conditions under which the MSAW function may be inhibited for individual aircraft tracks as well as procedures applicable in respect of flights for which MSAW has been inhibited.
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