# SDR CALA2026072017864

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 17, 2026
- Submitted: July 20, 2026
- Operation: Air carrier
- Aircraft: [N798UA](https://openairdocs.org/aircraft/N798UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26928
- Aircraft time: 114,882 hours, 15,151 cycles
- System (JASC): [3230 · Landing Gear Retraction/Extension System](https://openairdocs.org/jasc/3230)
- Part: Selector Valve
- Part number: 3910028103
- Condition: Faulted
- Location: Nlg
- Stage of operation: LD
- How discovered: O
- Nature of condition: J
- Precautionary procedure: L
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026072017864

## Discrepancy

LANDING GEAR DISAGREE EICAS. NOSE GEAR DID NOT COME DOWN INITIAL LY DEBRIEFED CREW , PILOTS ADVISED ME ON APPROACH THAT AT 1600 FT CALLED FOR GEAR DOWN. THE MLG CAME DOWN & LOCKED ON , BUT THE NOSE GEAR DIDN'T . THEY DID A GO AROUND WENT AROUND AT 1000FT . THEN AT 2000 FT THERE WAS A MLG EICAS DISAGREE STATUS MESSAGE .THEY RETRACTED THE MLG AND NLG UP & LOCKED .THEN ATTEMPTED ANOTHER APPROACH AT 2500 FT TO BRING DOWN MLG AND NLG . THE MAIN GEAR & NOSE GEAR FINALLY CAME DOWN & LOCKED. AHM ALERT 32-3166-Y921 NOSE LANDING GEAR DOOR SLOW TO START DURING EXTENSION. FIM TASK TO FOLLOW 32-30-00-810-810. TECHS CYCLED GEAR DOOR OPEN/CLOSE SEVERAL TIMES AND NOTED THAT NOSE GEAR DOORS OPEN ABNORMALLY SLOW.  REF FIM: 32-30 TASK 810. R & R NOSE LANDING GEAR SELECTOR VALVE. COMPLETED INSTALLATION UP TO INCLUDING STEP 3.F(15).

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.