Service difficulty report · Control Unit · Airbus A320232

Difficulty date
October 29, 2023
Submitted
October 31, 2023
Operation
Air carrier
Aircraft
N411UA
Make and model
Airbus A320232
Aircraft serial
464
Aircraft time
92,159 hours, 36,041 cycles
Part
Control Unit
Part number
664700500A4D
Condition
Weak
Location
90vu
Part time
792,159 hours, 736,041 cycles
Stage of operation
CR
How discovered
O
Nature of condition
G, J, O
Precautionary procedure
A

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

What was found

N LG SHOCK ABSORBER(2526GM)/IDLGCIU 2 WITH FAILURE MSG N LG EXTPROX SNSR(24GA)TGT POS /IDLGCIU 1 LOCKING LOG FOR POSITIVE FIX. OK TO UNLOCK TO CLEAR UNIT, LGCIU VK0 OFF 31-3260-9-0001 9224 ON 0000 UNIT, LGCIU VK0 OFF 31-3260-9-0001 9224 ON 31-3231-9-0002 0261 LGCIU-1 LAST LEG REPORT SHOWED: 527112: AFT CARGO DR SAFETY MECH PROX SNSR(32WV) TGT POS; 323173: N LG EXT PROX SNSR(24GA) TGT POS; 322113: NLG SHOCK ABSORBER . FAULTS ON PHASE 6 (CRUISE). T/S IAW TSM 32-31-00-810-842-A. INSPECTED NLG EXT SENSORS 24GA & 25GA, NO FAULTS NOTED. CONNECTORS 24GA_A, 25GA_A PIN RETENTION CHKD GOOD, BACKSHELL & WIRES CHKD NORMAL. FOUND LGCIU-1 NORMAL C/B, 1GA, WEAK. REPLACED C/B. ALSO REPLACED LGCIU-1 IAW AMM 32-31-71-400-001-A. PERFORMED LGCIU BITE IAW AMM 32-69-00-740-001-A. NO FAULTS NOTED. ALSO PERFORMED BITES ON AFT CARGO DOOR SWITCH, ADIRU-3, STBY PITOT ANTI-ICE WHICH WERE CAUSED BY LGCIU-1 FAULT. NO FAULTS NOTED. FAULT DISPLAYED ON UPPER ECAM SCREEN. - F -CTL UPDATED MAA CODE. SFCC-2 FLAP LAST LEG REPORTS SHOWED 31-12-34: NO CFDIU DATA, CHECK WIRING TO FLP 2. CLEANED CONNECTORS ON SFCC-1 &-2, CFDIU. SCFCC-2 STATUS & ON GND FAULTS CHKD GOOD. RAN FLAPS, NO FAULTS NOTED. DURING OTHER T/S ON A DIFFERENT SYSTEM, SFCC-2 GLITCHED. WHEN RECOVERED, IT SHOWED NO FAULTS. SUSPECT SFCC-2. SFCC 2 REP

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