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Fault finding

APU not reaching rated speed

APU · Honeywell

AeronauticalHigh difficulty

Symptoms

Slow start, high EGT, automatic shutdown.

Probable causes

  • Clogged fuel filter
  • FCU out of adjustment
  • Stuck bleed valve
  • Weak starter

Solution

Replace the fuel filter, check FCU adjustment, and inspect the bleed valve and the battery/starter in accordance with the AMM.

The information on this page is general guidance. It does not replace the manufacturer’s manual or the work of a qualified technician: before any intervention, always check procedures, tightening torques and safety requirements in the official documentation of the machine.

Field experiences

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