SDR ASAA2019061129663

Service difficulty report · Display · Boeing 737890

Difficulty date: June 10, 2019
Submitted: June 11, 2019
Operation: Air carrier
Aircraft: N570AS
Make and model: Boeing 737890
Aircraft serial: 35185
Aircraft time: 46,624 hours, 13,850 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Display
Condition: Malfunctioned
Location: First Officer'S
Stage of operation: NR
How discovered: O
Nature of condition: J
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

VTK FLAG APPEARED ON FO'S MFD AND DISAPPEARED 30 SECONDS LATER. DURING THAT TIME WE LOST LNAV/VNAV CAPABILITY AND THE AUTOPILOT REVERTED TO CWS. AFTER 30 SECONDS AND WHEN VTK/FLAG DISAPPEARED WE WERE ABLE TO REENGAGE FO'S AUTOPILOT ALONG WITH VNAV/LNAV. GROUNDED - YES. ACCOMPLISHED RT SIDE FMC COMPUTER OPS TESTS REF B737-800 AMM 34-60-00. SYS CKS NML. ACCOMPLISHED LEFT AND RT FMC LRU REPLACEMENT TEST PER AMM 22-11-00/501. SYS CKS NML. ACCOMPLISHED DFCS LRU REPLACEMENT PER AMM 22-11-00/501. ALL TESTS PASSED.