# SDR ASAA2021032734428

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 27, 2021
- Submitted: March 29, 2021
- Operation: Air carrier
- Aircraft: [N918AK](https://openairdocs.org/aircraft/N918AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 44083
- Aircraft time: 124 hours, 73 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: 1762000101
- Part serial: 001937
- Condition: Faulty
- Location: Captain
- Part time: 84 hours, 28 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021032734428

## Discrepancy

BOTH FMC PROMPTS DISAPPEARED ON PUSHBACK. CA'S VTK FLAG, MAP FLAG, RUNWAY FLAG, CAUTION LIGHTS ILLUMINATED. FMC SWITCH IN NORMAL. GROUNDED - YES. CONFIRMED FAULT, CURRENT STATUS PAGE SHOWS MAINTENANCE MESSAGE 34-61001 "FMC-1 HAS AN INTERNAL FAULT". ACCOMPLISHED B737-9 IFIM TASK 34-61-00-810-883, VERIFIED FMC-1 DEFECTIVE. REMOVED & REPLACED FMC-1 AND ACCOMPLISHED FMC SOFTWARE CROSSLOAD PER B737-9 AMM 34-61-00-470-802. PULLED & RESET C/B. VERIFIED CORRECT SOFTWARES PER APIC. PERFORMED FLIGHT MANAGEMENT COMPUTER SYSTEM OPERATIONAL TEST REF AMM 34-61-00-710-801, OPS CK NML. CONSULTED BOEING ENGINEERING & ALASKA TECH SERVICE, OK TO RETURN AIRCRAFT BACK TO SERVICE.

---
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.