SDR 2004UALA01023

Service difficulty report · Computer · Boeing 767322

Difficulty date: November 7, 2004
Submitted: November 16, 2004
Operation: Air carrier
Aircraft: N651UA
Make and model: Boeing 767322
Aircraft serial: 25389
Aircraft time: 55,198 hours, 8,974 cycles
Engine: Pwa PW4060
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Computer
Condition: Failed
Location: Flt Manage
Stage of operation: CL
How discovered: O
Nature of condition: O
Precautionary procedure: A

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

What was found

RIGHT FMC CDU FAILED. RIGHT CDU WAS REPLACED. SHOP COULD NOT DUPLICATE CDU BLANKING DURING HOT, COLD AND VIBRATION OPERATION ON BENCH. AS A PRECAUTION, SHOP REPLACED COMPONENTS A6A2Q7, A6A2Q8, A6A2U16, A2A2U45, A2A2U48 IN CDU. THE CDU (MR40219-185) WAS REMOVED AND RETURNED TO THE SHOP. SHOP FOUND THE DISPLAY WAS DIM BUT NOT BLANK AND REPLACED THE CRT AND YOKE ASSEMBLY.