SDR IPXA2020021435094

Service difficulty report · Fmc · Boeing 75724APF

Difficulty date: February 12, 2020
Submitted: February 17, 2020
Operation: Air carrier
Aircraft: N426UP
Make and model: Boeing 75724APF
Aircraft serial: 25457
Aircraft time: 27,441 hours, 18,854 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Condition: Malfunctioned
Stage of operation: CR
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

WHILE AT CRUISE FL280 REC'D AN "ATC" CHIME FOR CPDLC RADIO CHG. SUBSEQUENTLY THE FOLLOWING INDICATIONS WERE DISPLAYED: AUTOPILOT, A YELLOW LINE THRU VNAV PATH & LNAV FMAS RED AIRSPEED INDICATOR DROP 310 KTS TO 220 KTS THEN RETURNED, VNAV KICKED OFF AND REVERTED TO ALTITUDE HOLD.REPLACED ACARS CMU IAW AMM 23-22-01. OPS CK GOOD. CORRECT SOFTWARE INSTALLED IAW ACFT SOFTWARE MATRIX VERSION 84. THIS CLEARS M698855, PLACARD REMOVED.

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