SDR CALA2026100620165

Service difficulty report · Logic Card · Boeing 7378

Difficulty date: October 1, 2026
Submitted: October 6, 2026
Operation: Air carrier
Aircraft: N37278
Make and model: Boeing 7378
Aircraft serial: 61859
Aircraft time: 13,240 hours, 4,505 cycles
System (JASC): 3897 · Water/Waste System Wiring
Part: Logic Card
Part number: 1742F9
Part serial: 32033
Condition: Faulted
Location: Zone 900
Part time: 13,232 hours, 4,501 cycles
Stage of operation: IN
How discovered: V
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

AFT LAV WASTE INDICATES ZERO AFTER FLT, SEWAGE ODOR INFLIGHT, LAV INDICATORS ERONIOUS. ACCOMPLISHED INSPECTION OF WASTE WATER TANK, NO ACTIVE LEAKS NOTED, SERVICED WASTE SYSTEM WITH NO DEFECTS. NO SEWAGE NOTED. REMOVED AND REPLACED THE WASTE TANK LOGIC ASSY AND CLS SENSOR IAW AMM 38-33-03 AND AMM 38-33-02, OPS CHKD GOOD.

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