Service difficulty report · Apu · Boeing 737800*

Difficulty date
August 4, 2026
Submitted
August 6, 2026
Operation
Air carrier
Aircraft
N846SY
Make and model
Boeing 737800*
Aircraft serial
39025
Aircraft time
30,077 hours, 17,443 cycles
Part
Apu
Condition
Smoke
Location
Zone 100
Stage of operation
TX
How discovered
O
Nature of condition
K, B
Precautionary procedure
O

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

What was found

WHITE SMOKE CAME OUT OF APU EXHAUST AFTER SHUT DOWN. REF AML 816815 ITEM 1. WHITE SMOKE CAME OUT OF APU EXHAUST AFTER SHUTDOWN. INSPECTED APU PER FIM 49-95 TASK 801 FOUND SMALL AMOUNT OF OIL FROM AFT DRAIN. FOUND LARGE OIL WETTING ON & AROUND MIDDLE TURBINE BEARING SUPPORT STRUT. PER FIM 49-95 TASK 801 E.1(A) SUGGESTS APU REPLACEMENT. REMOVED AND REPLACED APU RED TASK CARD 490000000. OPS TEST NORMAL. THIS CLEARS MEL 49-1-A MDDR# 140705. - ADDITIONAL: INSPECTED APU PER FIM 49-95 TASK 801 FOUND SMALL AMOUNT OF OIL FROM AFT DRAIN. FOUND LARGE OIL WETTING ON & AROUND MIDDLE TURBINE BEARING SUPPORT STRUT. PER FIM 49-95 TASK 801 E.1(A) SUGGESTS APU REPLACEMENT.

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