If the EEC normal mode is not available, to which mode does the EEC downgrade?

If the EEC normal mode is not available, to which mode does the EEC downgrade?

• A. Normal mode with degraded protections
• B. Soft alternate mode
• C. Off
• D. Cold standby

Answer: (B)

When the Electronic Engine Control can’t operate in normal mode, it needs a safe, degraded operating state that still keeps the engine running. The designated fallback is the soft alternate mode. In this mode the EEC provides reduced protections and limited functionality compared with normal mode, enough to maintain control and avoid an immediate shutdown while a fault is diagnosed or repaired. The other states don’t fit this situation: off would stop control entirely, cold standby is a start-mode used during engine start procedures, and normal mode with degraded protections is not the standard fallback path defined for loss of normal mode.

When the Electronic Engine Control can’t operate in normal mode, it needs a safe, degraded operating state that still keeps the engine running. The designated fallback is the soft alternate mode. In this mode the EEC provides reduced protections and limited functionality compared with normal mode, enough to maintain control and avoid an immediate shutdown while a fault is diagnosed or repaired. The other states don’t fit this situation: off would stop control entirely, cold standby is a start-mode used during engine start procedures, and normal mode with degraded protections is not the standard fallback path defined for loss of normal mode.