SDR ASAA2018090425990

Service difficulty report · Warning System · Boeing 737990ER

Difficulty date: September 2, 2018
Submitted: September 4, 2018
Operation: Air carrier
Aircraft: N434AS
Make and model: Boeing 737990ER
Aircraft serial: 61620
Aircraft time: 10,002 hours, 3,272 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Warning System
Condition: False Activation
Location: Cockpit
Stage of operation: CR
How discovered: O
Nature of condition: N
Precautionary procedure: K

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

What was found

DURING CRUISE FO PFD DISPLAYED AMBER VTK FLAG, AMBER LDG ALT AND AMBER RNP/ANP INDICATIONS ON NAV DISPLAY, RETURNED TO NORMAL DISPLAYS LESS THAN 20 SECONDS. GROUNDED - YES. FLIGHT FAULT REVIEW, FMC-R PRES POS LATE- RATE FAULT LOGGED ONCE. ACCOMPLISHED FIM 34-61-00-810-801, FMC BITE TEST PROCEDURES AND NO CURRENT FAULT, ALL OPS CK GOOD. ACCOMPLISHED RIGHT ADIRU BITE PROCEDURES PER FIM 34-21 TASK 801 AND NO CURRENT FAULT, ADIRU OPS CK GOOD.