From: (Brad Gillies)
Organization: Leading Edge Aviation Services
Date:         15 Jun 95 01:13:59 
References:   1
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 A surge is caused when the airflow through te engine is disturbed
This can be caused by a number of factors. If the airflow through
the compressors of the engine is disturbed  for some reason
the engine will "STALL" the airflow is actually reversed for a
brief moment causing a loud bang and possibly damage to the
Most modern engines have alleviated the problem with the
use of computers to schedule bleed valve opening and
closing as well as variable stator vane scheduling.  This
prevints irratic airflow from causing Stall (surge).

This is just a simple description E-Mail for more detailed info

Brad Gillies
Compuserve: 74163,2040
Leading Edge Aviation Services
My opinions are mine all mine.I won't let
anyone else take credit or blame.