Service difficulty report · Control Unit · Boeing 777300ER

Difficulty date
April 19, 2021
Submitted
April 19, 2021
Operation
Air carrier
Aircraft
N2136U
Make and model
Boeing 777300ER
Aircraft serial
62648
Aircraft time
16,777 hours, 1,648 cycles
Part
Control Unit
Condition
Failed
Location
Brake System
Stage of operation
NR
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

ANTISKID EICAS ADVISORY ANTISKID FAULT AFFECTING BRAKE HYDRAULIC SYSTEM IN USE (NORMAL O R ALTERNATE) CAUSING LOSS OF SKID PROTECTION, INCLUDING CONTROL UNIT FAILURE, ANTISKID VALVE FAILURES, PARKING BRAKE VALVE NOT F ULLY OPEN WITH PARKING BRAKE RELEASED; ANTISKID FAULT CAUSING LO SS OF BRAKING TO TWO OR MORE WHEELS PER GEAR FIM TASK REF : FIM TASK REFERENCE NOT FOUND CMC MSG# 3230630 FLIGHT STATUS: A INTERMITTENCE CODE: H PH: CRUISE NARRATIVE: BRAKE SYSTEM CONTROL UN IT (SECONDARY CHAN) SEE L/P 6156009. THE PROBLEM FIXED BY FOLLOWING FIM 32-42 TASK815. LP 6156009 : ANTISKID EICAS STATUS ANTISKID FAULT CAUSING LOSS OF SKID PROTECTION TO TWO OR MORE WH EELS PER GEAR IN THE NORMAL BRAKE HYDRAULIC SYSTEM, INCLUDING CO NTROL UNIT FAILURE, NORMAL ANTISKID VALVE FAILURES, AND PARKING BRAKE VALVE NOT FULLY OPEN WITH PARKING BRAKE RELEASED; ANTISKID FAULT CAUSING LOSS OF BRAKING TO TWO OR MOR FIM TASK REF : FIM TASK REFERENCE NOT FOUND CMC MSG# 3230630 FLIGHT STATUS: A INTERMITTENCE CODE: H PH: CRUISE NARRATIVE: BRAKE SYSTEM CONTROL UN IT (SECONDARY CHAN), MX MSG 32-30630. FOLLOWED FIM 32-42 TASK 815. RERACKED THE BSCU WHILE RECYCLING C.B.S ON P110, P210, P310. PERFORMED AUTOBRAKE APPLICATION TEST. PASSED. THE ANTISKID PROBLEM BECAME NOT ACTIVE. THE MSG DISAPPEARED.

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