# SDR CALA2026042315656

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 20, 2026
- Submitted: April 23, 2026
- Operation: Air carrier
- Aircraft: [N79402](https://openairdocs.org/aircraft/N79402), registered now
- Make and model: Boeing 737924
- Aircraft serial: 30119
- Aircraft time: 65,791 hours, 27,555 cycles
- System (JASC): [3810 · Potable Water System](https://openairdocs.org/jasc/3810)
- Part: Drain Mast
- Part number: 417A20932
- Part serial: 402
- Condition: Missing
- Location: Sta 500i
- Stage of operation: IN
- How discovered: O
- Nature of condition: D
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026042315656

## Discrepancy

UPON ARRIVING TO THE GATE RAMP REPORTED THERE WAS METAL HANGING FROM THE  A/C WHEN MYSELF AND TECHS WENT OUT WE REALIZED IT WAS THE FWD DRAIN MAST THAT WAS MISSING. ADDED PHOTOS REF L/P 8622727 FOR MX ACTION MAST, DRAIN, WA  OFF 29-3831-9-9001 3818 ON 0000 RAMP REPORTED METAL LOOSE NEAR GROUND CONDITIONED AIR ACCESS PANEL ON BELLY FOUND DRAIN MAST BROKEN OFF REMOVED WHAT REMAINED OF OLD FWD DRAIN MAST IAW AMM 38-31-01. PREPAIRED TO INSTALL NEW DRAIN MAST WITH NEW MAST EXTENSION, WHEN NOTICED THE ATACHING HARDWARE IS DIFFERENT. THE OLD MAST WAS HELD ON TO THE FUSULAGE WITH COUNTERSUNK BOLTS BUT NEW MAST  COMPLETED AMM 38-31-01 TO END. OPS CKECKS GOOD

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