- Difficulty date
- September 9, 2021
- Submitted
- September 14, 2021
- Operation
- Air carrier
- Make and model
- Boeing 737990ER
- Aircraft serial
- 41734
- Aircraft time
- 31,453 hours, 10,119 cycles
- Part
- Switch
- Condition
- Inoperative
- Location
- Control Panel
- Part time
- 74,209 hours, 29,744 cycles
- Stage of operation
- NR
- How discovered
- 9
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LNAV SWITCH INOP. GROUNDED - YES. REMOVED & REPLACED DFCS MCP REF B737-900 AMM 22-11-34. ACCOMPLISHED MCP LRU REPLACEMENT TEST (GP 32) REF AMM 22-11-34, DFCS LAND VERIFY TEST (GP 49) REF AMM 22-11-00, & HGS SYSTEM TEST REF SMM 34-36-00, OPS CK NML.