Service difficulty report · Gcu · Boeing 777222

Difficulty date
October 28, 2024
Submitted
October 30, 2024
Operation
Air carrier
Aircraft
N777UA
Make and model
Boeing 777222
Aircraft serial
26916
Aircraft time
107,263 hours, 19,604 cycles
Part
Gcu
Part number
756603E
Part serial
0719
Condition
Faulty
Part time
49,472 hours, 5,160 cycles
Stage of operation
CL
How discovered
O
Nature of condition
J, H
Precautionary procedure
A

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

What was found

RIGHT STANBY BUS EICAS AND MULTIPLE OTHER EICAS MESSAGES REPLACED RIGHT GCU PRECAUTINARY AMM 24-22-02-400-801.PARTS USED: 25-2422-9-0002,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1835834 SN OFF 0719 UNIT, GENERATOR OFF 25-2422-9-0002 0719 ON 27-2421-9-0001 0735 REF FIM: 24-32 TASK 803 STEP G.(3), REPLACED THE DC STANDBY CARD, M24406A12 IN THE P310 PANEL PER AMM TASK 24-09-00-000-806-001 AND TASK 24-09-00-400-805-001. PARTS USED: 1718105,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1718105 SN OFF 9022 MODULE, ELMS D. OFF 27-2400-9-0010 9022 ON 27-2400-9-0010 9361 C/B PANEL P210 J2 AND N12 OPENED AND TAGGED. RIGHT ENGINE T/R DEACTIVATED. REMOVED IDG REF TASK 24-11-01-000-801-001. IDG P/N OFF 767146A S/N OFF AAAG003834 REPLACED AND INSTALLED GENERATOR, IDG PER AMM 24-11-01, TASK 71-00-00-800-801-N00, OPERATIONAL TEST FOR THE RIGHT IDG, TASK 24-11-00-700-802.PARTS USED: 1561236,QTY :1 ADD EMP:U384123 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1561236 SN OFF 3834 GENERATOR, INTE OFF 25-2411-9-0001 3834 ON 25-2411-9-0002 0200 RE ACRIVATED RH ENG T/R REF. AMM 78-31-00. REFERENCE FIM: 24-32 TASK 804, REPLACED RELAY K24016 IN P310. STATUS MSG CLEARED.