SDR UIEA2018041800733

Service difficulty report · Tube · Boeing 767375

Difficulty date: April 17, 2018
Submitted: April 19, 2018
Operation: Air carrier
Aircraft: N1217A
Make and model: Boeing 767375
Aircraft serial: 25865
Aircraft time: 89,299 hours, 22,721 cycles
System (JASC): 4950 · APU Bleed Air System
Part: Tube
Condition: Clogged
Location: Control Valve
Stage of operation: TX
How discovered: 9
Nature of condition: C
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

DUCT PRESSURE TO LOW FOR START, APU RUNNING, PACKS OF 22PSI ONCE STARTER ENGAGES DROPS TO 8 PSI, N2 MOTORS TO LESS THAN 10%. PERFORMED FIM 49-11 FAULT TREE 977, FOUND DEBRIS IN THE SURGE CONTROL VALVE SUPPLY TUBE. REMOVED THE DEBRIS, NO FURTHER FAULTS FOUND.