SDR IPXA2023070402978

Service difficulty report · Fmc · Boeing 767304

Difficulty date: July 4, 2023
Submitted: July 5, 2023
Operation: Air carrier
Aircraft: N391UP
Make and model: Boeing 767304
Aircraft serial: 28039
Aircraft time: 88,293 hours, 18,404 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Fmc
Part number: RHFMC4052506955L
Part serial: RHFMC9702905
Condition: Frozen
Location: Unknown
Stage of operation: CL
How discovered: O
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

AIRTURN BACK DUE TO BOTH FMC UNRESPONSIVE IN LEGS + ROUTE PAGES ENTIRE ROUTE WAS ERASED. BOTH FMC IN STANDBY ONE. REPLACED BOTH FMC IAW AMM: 34-61-02/401, REV: 139. OPS TEST SATIS, VERIFIRED CORRECT SOFTWARE P/N ARE INSTALLED IAW SOFTWARE MATRIX, REV: 130.<BR><BR>CRN97068215 / ULLMER / Q9DY421Y