49-41010 NO ACCELERATION SHUTDOWN

[motortek]

Hi brothers, we have problem on our 737/800 ng apu

49-41010 NO ACCELERATION SHUTDOWN fault code taken from cdu.

We replaced ,

Starter generator
Fuel Control Unit
Blockage of unwanted materials in the air inlet duct and compressor inlet plenum for apu ( checked normal )

Fault history - no acceleration shutdown
maintenance history - Data memory module shows circuit fail.

On ground opr. we starting a few times but apu is normal.
After 10 - 20 cycle apu fault code coming .

Amazing point is apu oil indicator on apu doesnt change. on or off position is everytime is same.

[sjap]

How old is this apu?
Our experience is that after a long time (6 to 8 years) the APU is at its end of its life and is getting similar faults.
Investigation shows that the turbine wheel is burned away too much...
See this similar topic about the same fault:

[motortek]

[Dunny]

just encountered a persistent issue with fault code 49-41010. After changing many parts, lube unit change eventually made it go away.