# SDR DALA2019082704993

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 24, 2019
- Submitted: August 27, 2019
- Operation: Air carrier
- Aircraft: [N903DN](https://openairdocs.org/aircraft/N903DN), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 32007
- Aircraft time: 3,126 hours, 1,194 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Condition: Malfunctioned
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2019082704993

## Discrepancy

WHEN ENGAGING LNAV WITH F/D 1 MASTER, ARM MODE FLASHES ON FMA, BUT WHEN F/D 2 IS MASTER, IT GOES DIRECT TO ENGAGED INDICATION. RETURN TO GATE.   BITE OF FMCS SHOWED NO FAULTS PER B737 FIM 34-61. BIT OF DFCS PER B737 FIM 22-11 .

---
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.