Service difficulty report · Warning System · Boeing 777222

Difficulty date
May 22, 2010
Submitted
May 24, 2010
Operation
Air carrier
Aircraft
N212UA
Make and model
Boeing 777222
Aircraft serial
30218
Aircraft time
35,628 hours, 7,847 cycles
Engine
Pwa PW4084
Part
Warning System
Condition
Intermittent
Location
Cocpkit
Stage of operation
IN
How discovered
O
Nature of condition
N
Precautionary procedure
O

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

What was found

HYD PUMP DEM L LOW LT HYD DEMAND PUMP PRESSURE WHEN COMMANDED ON OR LT DEMAND PUMP OVERHEAT. STATUS MSG01- NOT ACTIVE CLIMB MODE DEPENDENT; ELCU (HYD ACMP L) IN P200 IS NOT IN COMMANDED POSITION. DB- ELMS P210 ELECTRONICS UNIT MSG02- LATCHED CLIMB MODE DEPENDENT; ELCU (HYD ACMP L) IN P200 SENSED POSITION DOES NOT AGREE WITH COMMANDED POSITION. DB- HYD INTERFACE MODULE (HYDIM) (L) MSG-2917003 INACTV CL MODE MSG-2912000 LATCHD CL MODE. OPS CHK OK AT HNL. NO MESSAGES ON ARRIVAL. OK IAW FIM 29-11TSK890 AND FIM 29-11-TSK918. NO FAULTS FOUND. INTERMITTENT FAULT IAW FIM. OPERATED LT HYD DEMAND PUMP, OPERATION NORMAL. PRESSURIZED AND DEPRESSURIZED NORMALLY, NO MESSAGES.