Service difficulty report · Servo Valve · Boeing 757324

Difficulty date
September 1, 2017
Submitted
September 1, 2017
Operation
Air carrier
Aircraft
N74856
Make and model
Boeing 757324
Aircraft serial
32815
Aircraft time
42,736 hours, 13,867 cycles
Part
Servo Valve
Part number
A71874005
Part serial
2674
Condition
Cracked
Location
Nr 3 Spoiler
Part time
24,977 hours, 7,711 cycles
Stage of operation
CR
How discovered
O
Nature of condition
K, J
Precautionary procedure
O

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

What was found

LEFT HYD QTY EICAS C THE LEFT HYDRAULIC RESERVOIR QUANTITY IS LOW. EMERGENCY DECLARED. FOUND NR 3 SPOILER HYD SERVO VALVE CRACKED AND LEAKING. REPLACED NR 3 SPOILER HYD SERVO VALVE. ALSO DISCONNECTED AND RECONNECTED PCA ROD END AT THE SPOILER TO FACILITATE HYD SERVO VALVE REPLACEMEN T. CYCLED SPOILERS SEVERAL TIMES AND NO MORE LEAKS NOTED. RESERVICED LEFT HYD SYSTEM FLUID IAW AMM 27-61-02-022-001.