A B737-700 returned to field due to a number two engine edp (engine driven pump) case drain line tha...

Attributes
ACN	900465
Time
Date	201007
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Hydraulic System Lines Connectors Fittings
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural FAR Deviation - Procedural Published Material / Policy

Narrative:

I was replacing the number two engine edp (engine driven pump) case drain filter and during the process had disconnected the quick disconnect hose that extends from the filter to the pylon to minimize loss of hydraulic fluid through gravity during filter housing removal. This was the last filter of the evening I was changing and after installing safety wire I began checking all the other filters below the engine that I had changed to make sure they were safetied as well. Having moved my ladder to do this as well as working on other related items; I did not realize that I had failed to reconnect the [case drain] hose at the pylon. This was discovered two days later after the aircraft was an hour into flight and was required to [do an] air turn back.

Original NASA ASRS Text

Title: A B737-700 returned to field due to a number two engine EDP (Engine Driven Pump) case drain line that had not been reconnected after hydraulic filter changes.

Narrative: I was replacing the number two engine EDP (Engine Driven Pump) case drain filter and during the process had disconnected the quick disconnect hose that extends from the filter to the pylon to minimize loss of hydraulic fluid through gravity during filter housing removal. This was the last filter of the evening I was changing and after installing safety wire I began checking all the other filters below the engine that I had changed to make sure they were safetied as well. Having moved my ladder to do this as well as working on other related items; I did not realize that I had failed to reconnect the [case drain] hose at the pylon. This was discovered two days later after the aircraft was an hour into flight and was required to [do an] air turn back.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

A B737-700 returned to field due to a number two engine edp (engine driven pump) case drain line that had not been reconnected after hydraulic filter changes.