Service difficulty report · Pump · Boeing 7379

Difficulty date
December 31, 2024
Submitted
January 2, 2025
Operation
Air carrier
Aircraft
N77578
Make and model
Boeing 7379
Aircraft serial
67613
Aircraft time
4,044 hours, 1,283 cycles
Part
Pump
Part number
3033096100
Part serial
MX859266
Condition
Faulted
Location
Hyd System
Part time
2,936 hours, 923 cycles
Stage of operation
TX
How discovered
9
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

LOW PRESSURE LIGHT ELEC 2 PUMP ON FOR INITIAL EVAULATION CYCLED CB C8 ON P92 PANEL. NO HELP. UPON FOLLOW UP WITH PILOTS, THEY STATED NO PRESSURE INDICATION FROM ELEC 2 PUMP SYSTEM A INDICATION. ONLY WITH ENGINE RUNNING HAD PRESSURE INDICATION. UPON OPENING OF P92 PANEL FOUND CB F3 POPPED FOR ELEC HYD PUMP SYS A. RESET BREAKER AND OPERATED PUMP, WHICH QUICKLY RESULTED IN CIRCUIT BREAKER TO POP AGAIN. DISCONNECTED D2664 FROM PUMP, CB DID NOT POP. 'B' PHASE LEG IN PUMP IS OPEN, REF WD29-11-12. REMOVED ELECTRIC HYDRAULIC PUMP A IN REF AMM 29-11-21-000-801 REPLACED A SYSTEM ELECTRIC HYD. PUMP REF. AMM 29-11-21-400-801. OPS CHECKED AND LEAK CHECK. NO LEAKS TESTED GOOD. REPLACED A SYSTEM ELECTRIC HYD. PUMP REF. AMM 29-11-21-400-801. OPS CHECKED AND LEAK CHECK. NO LEAKS TESTED GOOD.

More about the Boeing 737-9