Service difficulty report · Accumulator · Bombdr BD1001A10

Difficulty date
January 18, 2024
Submitted
January 19, 2024
Operation
Air carrier
Aircraft
N780QS
Make and model
Bombdr BD1001A10
Aircraft serial
20569
Aircraft time
8,330 hours, 4,706 cycles
Part
Accumulator
Part number
3314750
Part serial
601181850NAE
Condition
Defective
Location
Brake Pressure
Stage of operation
TX
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

OUTBD BRAKE PRESS LO AMBER CAS: OUTBOARD BRAKE PRESSURE LOW. INSTANTANIOUS PRESSUE CHANGE FROM NORMAL TO LOW (LESS THAN 1 SEC) WHEN L/R PUMPS SET FROM ON TO AUTO. REPEATED/REPLICATED MULTIPLE TIMES. FOUND THE OTBD BRAKE ACCUMULATOR HAS FAILEO. WMF 3000 PSI ON THE SYSTEM THE ACCUMULATOR PRESSURE ONLY READS 900PS1 AND TLIE PER CHARGE JS OKAY. WE HAVE ATTEMPTED TLIE FREE UP THE ACCUMULATOR BY CYCUNG TLIE PRESSURE ON THEN BLEEDING DOWN THE PRESSURE. UNFORTIJNATELY, WE WERE UNSUCCESSFUL. REMOVED FALLED ACCUMULATOR AND INSTALLED NEW ACCUMULATOR IAW CL350AMM 31-43-37. OPS ANO LEAK ( CHECKS SATISFACTORY. NO DEFECTS NOTED