Observing error :syntax error in expression

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# 1  
Observing error :syntax error in expression


a1="04:29:39 - System health check failed"

echo "a $((a$i))"

The script above gives the following error
$113> sh tryt.sh 1
tryt.sh: line 6: 04:29:39 - System health check failed: syntax error in expression (error token is ":29:39 - System health check failed")

It also fails when I try to compare in if condition. How to compare a$i to a value in if condition. My purpose is to display the statement.
Can someone explain?
# 2  
You can't use that construct for indirection; it has a limited use only if a1 holds a numerical value. Recent bashs provide variable indirection:echo ${!a1}.
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