Service difficulty report · Hydraulic Line · Boeing 757200

Difficulty date
December 5, 2023
Submitted
December 14, 2023
Operation
General aviation
Aircraft
N119NA
Make and model
Boeing 757200
Aircraft serial
24487
Aircraft time
72,641 hours, 27,469 cycles
Part
Hydraulic Line
Part number
312NN510131
Part serial
NA
Condition
Worn
Location
Zone 500
Stage of operation
CR
How discovered
V
Nature of condition
J, K
Precautionary procedure
D

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

What was found

DURING ROUTINE FLIGHT AIRCRAFT N119NA HAD ECAIS MESSAGE L HYD QTY ,AND L HYD SYS PRESS. AFTER FURTHER INVESTIGATION FOUND ENGINE DRIVEN PUMP HYDRAULIC LINE PN 312N5101-31 HAD WORN A GROVE THAT ALLOWED DEPLETED OVER HALF OF SYSTEM QUANTITY TO LEAK. CONTRIBUTING FACTOR WAS FROM SUPPORT BLOCK 312N5110-5 WORN OUT WHICH ALLOWED METAL-ON-METAL CONTACT.

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