DAIDS the primary system does not further improve aircraft safety, but allows additional fuel saving due to the fact that the AFM procedures can be replaced by less conservative criteria for the activation of the ice protection systems. Airbus Industrie has intensively studied such a system, but is not convinced of its benefits. Therefore Airbus Industrie has decided not offer a primary system on their aircraft.
Event  FWC  Panel Indication  Crew Action 
ECAM Engine /Warning display (WARNING/MEMO)  CAUTION  Model Sel  NAI/WAI 
Normal  Ice detected  ICE DETECTED ENG A.ICE / WING A.ICE  Nil  ON (?)1 
Severe ice detected  SEVERE ICE DETECTED  Nil  ON (?)1 
No ice detected  Nil  Nil 
Failure  Computer failure (automatic function)  ANTI ICE AUTO CTL FAULT  MASTER +  FAULT  ANTI ICE MAN + FCOM procedure 
Probe Failure  ICE DET FAULT  MASTER +  FAULT  ANTI ICE MAN + FCOM procedure 
NAI / WAI valve / control failure  NAI / WAI FAULT message depending on the failure case  MASTER +  FAULT  FAULT  ANTI ICE MAN + FCOM procedure 

means Single Chime aural warning
1. means that the button automatically illuminates
Figure A10 - Possible procedure for a primary automatic ice detection system

50

B1 GENERAL

Safe aircraft operation in cold weather conditions raises specific problems: Aircraft downtime and delays in flight schedules. These can be minimized by a program of preventive cold weather servicing.
The operator must develop procedures for cold weather servicing during cold weather. This servicing must meet their specific requirements, based on:
.
Their cold weather experience;

.
The available equipment and material;

.
The climatic conditions existing at their destinations.

The Chapter 12-31 (Servicing - Aircraft protection) of the Airbus Industrie Aircraft Maintenance Manual (AMM) contains the appropriate information to assist the operator in defining developing and implementing cold weather preventive maintenance procedures that will minimize aircraft downtime and improve the safe operating level of their aircraft in adverse climatic conditions.

B2  DE-/ANTI-ICING AWARENESS CHECKLIST THE BASIC REQUIREMENTS
1. Responsibility
The person technically releasing the aircraft is responsible for the performance and verification of the results of the de-/anti-icing treatment. The responsibility of accepting the performed treatment lies, however, with the Commander. The transfer of responsibility takes place at the moment the aircraft starts moving under its own power.
2. Necessity
Icing conditions on ground can be expected when air temperatures approach or fall below freezing and when moisture or ice occurs in the form of either precipitation or condensation. Aircraft-related circumstances could also result in ice accretion, when humid air at temperatures above freezing comes in contact with cold structure.
　
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