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Whenthe controlunitdetects afailure in oneloop,dueto ashort orpower loss, there is no indication ofthe failure untilthe WARNtestis performed. The control unitwill automatically switchto single loopdetection. Single loopoperation can also be selectedbyplacingthedefective loop switch ontheFIREDETECTIONpanelfrom BOTHtothegoodloop(A orB). During normaloperations with oneloop selected,the followingtable liststheindications thatare displayed if a fire,failure, or power loss is detected: LOOP CONDITION (Dual Loops) INDICATIONS LOOP A LOOP B FAIL MESSAGE (Caution) FIRE WARNINGS Normal Normal Detecting Fire Detecting Fire ON Short orPower Failure Short orPower Failure ON Normal Detecting False Fire ON Normal Short orPower Failure Detecting Fire Short orPower Failure ON Detecting False Fire Normal ON Open Normal Short orPower Failure Open Open Open Open detecting fire Detecting Fire ON NOTE: 1. Normal, means a serviceable loop with no fire or short detected. 2. False Fire, means one loop detects a fire and the other loop is normal. 3. When a jet pipe overheat is detected, the ENG FIRE switchlight does not illuminate with the EICAS and aural warnings. Flight Crew Operating Manual MASTER
LOOP CONDITION (single loop) INDICATIONS
Flight Crew Operating Manual MASTER
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