SDR DALA2025020300797

Service difficulty report · Check Valve · Boeing 737832

Difficulty date: January 30, 2025
Submitted: February 3, 2025
Operation: Air carrier
Aircraft: N3766
Make and model: Boeing 737832
Aircraft serial: 30820
Aircraft time: 73,806 hours, 28,203 cycles
System (JASC): 3830 · Waste Disposal System
Part: Check Valve
Condition: Contaminated
Location: Zone 100
Stage of operation: IN
How discovered: V
Nature of condition: K
Precautionary procedure: K

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

What was found

(LOG 6868300) ON TAXI IN TO GATE AFTER SETTING PARKING BRAKE WE SMELLED AN ELECTRICAL SMELL IN THE COCKPIT AFTER SWAPPING ELECTRICAL POWER FROM ENGINES TO APU. FOUND STICKY FLUID AND GRAY WATER WASTE ON CHECK VALVE FROM RIGHT RECIRC FAN LEADING TO MIX MANIFOLD. FOUND BOTH LEFT AND RIGHT RECIRC FILTERS WITH EXCESSIVE DUST. R/R LEFTAND RIGHT RECIRC FILTERS IAW B737 AMM 21-25. R/R RIGHT RECIRC FAN IAW B737 AMM 21-25.