AWO.A.HUD.109 CS AWO.A.HUD.109 Head-up display landing systems

For HUDLSs that are used for primary guidance (HUD manual landing) during Category III operations (see Subpart B Section 4), the following are required:

- (a) System failure conditions that result in the inability to complete the landing from the DH until touchdown using the HUDLS shall not have a frequency of occurrence of more than once every thousand approaches. - (b) In the event of an engine failure, the HUDLS shall permit the pilot to control the aeroplane without reverting to other displays. - (c) Alignment should not be significantly affected in normal operation between scheduled maintenance activities.

[Issue: CS-AWO/2]