A line mechanic reports he failed to reconnect a case drain line to a number 2 engine driven hydraul...

Narrative:

I took a turnover from dayshift to complete a flush [procedure] of the number 2 hydraulic system; and to finish the installation of the number 2 engine driven hydraulic pump (edp). I used a highlift [vehicle] to gain access to the edp. Both cowl doors (forward and aft) were open. As I raised the lift; I was trying to be careful not to hit the aft cowl door. I was able to attach the pressure and return lines to the edp along with the drain line on the bottom of the edp. From the position I was at; I didn't see that the case drain line on top of the edp was capped. The flight crew reported to maintenance that the number 2 hydraulic system was low on fluid. [This was] due to; not closing the aft cowl door and extending the lift up to gain better access; I missed seeing the line on top of the edp. The edp was removed and replaced (right/right). [Would] suggest paying attention to details and take a closer look. Flight was canceled.

Original NASA ASRS Text

Title: A Line Mechanic reports he failed to reconnect a case drain line to a Number 2 Engine Driven Hydraulic Pump (EDP) on a DeHavilland Q-400 aircraft. Flight crew reported the Number 2 Hydraulic System was low on fluid. Flight canceled.

Narrative: I took a turnover from dayshift to complete a flush [procedure] of the Number 2 Hydraulic System; and to finish the installation of the Number 2 Engine Driven Hydraulic Pump (EDP). I used a highlift [vehicle] to gain access to the EDP. Both cowl doors (forward and aft) were open. As I raised the lift; I was trying to be careful not to hit the aft cowl door. I was able to attach the pressure and return lines to the EDP along with the drain line on the bottom of the EDP. From the position I was at; I didn't see that the case drain line on top of the EDP was capped. The flight crew reported to Maintenance that the number 2 Hydraulic System was low on fluid. [This was] due to; not closing the aft cowl door and extending the lift up to gain better access; I missed seeing the line on top of the EDP. The EDP was Removed and Replaced (R/R). [Would] suggest paying attention to details and take a closer look. Flight was canceled.

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.

Attributes
ACN	984814
Time
Date	201112
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Q400
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Hydraulic System Pump
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

A line mechanic reports he failed to reconnect a case drain line to a number 2 engine driven hydraulic pump (edp) on a dehavilland Q-400 aircraft. Flight crew reported the number 2 hydraulic system was low on fluid. Flight canceled.