getting to grips with
CAT II / CAT III operations

Flight Operations Support & Line Assistance and AWO Interdirectorate Group
GETTING TO GRIPS WITH
CATEGORY II AND III
OPERATIONS

STL 472.3494/95 Issue 3
October 2001

Flight Operations Support & Line Assistance and AWO Interdirectorate Group
FOREWORD

The purpose of this brochure is to provide Airbus aircraft operators with the agreed interpretations of the currently applicable AWO regulations.
Should any deviation appear between the information provided in this brochure and that published in the applicable AFM and MMEL, the information given in AFM and MMEL shall prevail at all times unless agreement is obtained from the national operational authorities.
The brochure's objective is to provide recommendations that satisfy Category II and Category III operational and reliability requirements in order for an airline to obtain operational approval from the presiding operational authorities.
All recommendations conform to the current regulatory requirements and areintended to assist the operators in maximizing the cost effectiveness of their operations.
All brochure holders and users are encouraged to forward their questions and suggestions regarding this brochure.
Any questions with respect to information contained herein should be directed to:

SUMMARY

This document outlines the purpose of and concepts behind Category II andCategory III operations, as well as the approval process required to obtain Category II and Category III certification.
The objective of CAT II / CAT III operations is to provide a level of safety when landing in low visibility conditions, equivalent to that of 'normal' operating conditions. Category II / Category III constitutes the main part of All Weather Operations (AWO), which also consists of Category I, take-off, and taxiing in low visibility conditions.
Although CAT II / CAT III represents a significant investment for an airline, it is themost effective way in which an airline can maintain its schedule throughout the year without any diversions due to the weather. This results in lower costs incurred by otherwise expensive diversions and passenger compensation, as well as preventing degradation of the airline's image.
Although ICAO, the FAA and JAA regulations are slightly different, all refer to the same concepts for CAT II and CAT III operations.
The main difference between CAT II / CAT III operations is that Category II provides sufficient visual reference to permit a manual landing at DH, whereas Category III does not provide sufficient visual references and requires an automatic landing system.
Approval for CAT II / CAT III operations is dependent on four elements in order to maintain the required level of safety:
. the aircraft
. the airfield
. the flight crew
　
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