Service difficulty report · Shaft · Boeing 7879

Difficulty date
January 19, 2026
Submitted
January 20, 2026
Operation
Air carrier
Aircraft
N29971
Make and model
Boeing 7879
Aircraft serial
60147
Aircraft time
38,535 hours, 3,647 cycles
Part
Shaft
Condition
Damaged
Location
Hyd Pump
Component
Pump · Parker
Component part number
5306509
Stage of operation
CR
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

HYD PRESS PRI R EICAS PUMP OFF PER ECL PUMP STILL HAS FAULT REMOVED THE RIGHT ENGINE DRIVEN PUMP, FOUND DAMAGE TO THE SHAFT. IN ACCORDANCE WITH DMC B787-A-29-11-02-00B-520A-A FITTED ENGINE DRIVEN PUMP ON RIGHT ENGINE TO DMC-B787-A-29-11-02-00B-720A-A. COMPLETED ALL STEPS UP TO INSTALLATION TEST ONLY. PARAGRAPH D INSTALLATION TEST NEEDS TO BE COMPLETED. CARRIED OUT INSTALLATION TEST PARAGRAPHS D E AND F, INCLUDING AMM B787-A-29-11-00-46A-950A-A FLUSHING REQUIREMENT. LEAK TEST OK. NO DIFFERENTIAL PRESSURE PROBLEMS. OK FOR SERVICE PARTS ADD, INSTALLATION COMPLETED USING CROW BAR TOOL TO DMC-B787-A-29-11-02-00B-720A-A, VBAND CLAMP REPLACED AND SOLENOID REPLACED WITH REF TO TASK 7644898 PARTS USED: 25-7200-3-0340,QTY :1 78-7921-3-0002,QTY :1 78-2900-3-0041,QTY ADD EMP:V939563, :1 00-0586-3-2622,QTY :1 78-2912-3-0002,QTY :1 78-7311-3-0061,QTY :1 00-0585-3-1586,QTY :1 78-7321-3-0020,QTY :1 00-0606-3-0032,QTY :1 78-2900-3-0042,QTY :1 78-7900-3-0003,QTY :1 78-2900-3-0043,QTY :1 78-2900-3-0038,QTY :1 78-7311-3-0040,QTY :1 00-0584-3-1409,QTY :1 78-7264-3-0014,QTY :1 78-7311-3-0059,QTY :1 78-2900-3-0058,QTY :1 78-2911-9-9002,QTY :1 MFG PN ON - 53065-09 MFG SN ON - 530652733 M&E SN ON - 02733 M&E PN ON - 78-2911-9-9002 MFG SN OFF - 530652085 MFG PN OFF - 53065-09 ROTABLE PARTS CHG:TT # 1376629 SN OFF 2085 PN OFF 78-2911-9-9002 PUMP, HYD ENG D OFF 78-2911-9-9002 2085 ON 78-2911-9-9002 2733

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