SDR UIEA2018082201768

Service difficulty report · Plenum · Boeing 767306

Difficulty date: August 20, 2018
Submitted: August 23, 2018
Operation: Air carrier
Aircraft: N1321A
Make and model: Boeing 767306
Aircraft serial: 27957
Aircraft time: 82,713 hours, 19,262 cycles
System (JASC): 4920 · APU Core Engine
Part: Plenum
Condition: Contaminated
Location: Apu
Stage of operation: CR
How discovered: O
Nature of condition: B
Precautionary procedure: O

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

What was found

AT CRUISE, APPROX 5 MIN AFTER APU START A STRONG ODOR WAS DETECTED. AFTER APU SHUTDOWN THE ODOR DISSIPATED. IT CAME BACK DURING DESCENT AT APPROX 60,000, WITH L PACK OFF THE ODOR WAS LESS NOTICEABLE. PERFORMED FIM 21-00-21 LEFT PACK. FOUND NO TRACES OF OIL IN LT PACK DUCTING. FOUND OIL RESIDUE IN APU PLENUM DURING APU VISUAL INSPECTION. REF LBP 99475, ITEM 6 FOR CORRECTIVE ACTION OF PLENUM.