SDR DALA2022050203095

Service difficulty report · Bleed Air Sys · Boeing 757232

Difficulty date: April 27, 2022
Submitted: May 2, 2022
Operation: Air carrier
Aircraft: N672DL
Make and model: Boeing 757232
Aircraft serial: 25977
Aircraft time: 93,878 hours, 40,983 cycles
System (JASC): 4990 · APU Oil System
Part: Bleed Air Sys
Condition: Contaminated
Stage of operation: IN
How discovered: O
Nature of condition: O
Precautionary procedure: K

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

What was found

SHIP 672 FAINT MUSTY SMELL IN COCKPIT AT CRUISE. OCCURRED AGAIN INITIAL DESCENT. CORRECTIVE ACTION: C/W NO ODI PREVENTION PROGRAM. T/S PER B757 FIM 21-00-01/301 AND ENCOUNTERED THICK BLACK OIL SOOT IN APU BLEED DUCT WITH NO VISIBLE OIL LEAKS ON APU AND APU OIL LEVEL AT MINIMUM. R/R APU REF AMDS W/C. OPS AND LEAK CKS GOOD. C/W REMOVAL OF OIL CONTAMINATION OF AIR CONDITIONING AND PNEUMATIC SYSTEM PER B757 AMM 21-00. C/W CAPTURE AND REPORT ODI FOLLOW UP INFORMATION PER WC. (8481353)