- Difficulty date
- February 13, 2020
- Submitted
- February 19, 2020
- Operation
- Air carrier
- Make and model
- Boeing 737890
- Aircraft serial
- 35192
- Aircraft time
- 43,498 hours, 12,909 cycles
- Part
- Computer
- Part number
- 8221604101
- Part serial
- 16D2X1
- Condition
- Failed
- Location
- Autothrottles
- Part time
- 52,214 hours, 15,789 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
AUTOTHROTTLES WOULD NOT ENGAGE. GROUNDED - YES. A/T BITE SHOWS NUMEROUS FAULT MSG #22-31543 "A/T ENG 28VDC". ACCOMPLISHED B737-800 FIM 22-31 TASK 802 FAULT ISOLATION. REMOVED & REPLACED FCC-A REF B737-800 AMM 22-11-33. ACCOMPLISHED DFCS LRU REPLACEMENT TEST (GP 35), DFCS LAND VERIFY TEST (GP 49) REF AMM 22-11-00, A/T SYSTEM OPERATIONAL TEST REF AMM 22-31-00-710-801 & HGS SYSTEM TEST REF SMM 34-36-00, OPS CK NML. VERIFIED CORRECT FCC OPS SOFTWARES.