Originally Posted by
GS Pilot
Ideally I would like to find a reference to this in the MM.
The MM (Ch 76) will only give you the method to properly rig the FCUs. And that can include the P&W MM in some cases. Neither will give you results for improper rigging except maybe in a troubleshooting chart to "check rigging."
To give you some possibilites of why it happens, perhaps the manual or auto FCU was changed separately or the max fuel stop was adjusted and the throttle linkages were not rechecked/adjusted properly?
Sometimes the "complexity" of these old school FCU systems tend to intimidate younger mechanics with mostly EECU or FADEC experience. However not following the manuals properly is not a knowledge or experience problem regardless the "pains" of working on these legacy systems.