An A321 flight crew were confronted with low yellow and green hyrdualic system quantities enroute fo...

Narrative:

Prior to departure contract maintenance had removed some fluid from [the previously] over serviced green and yellow hydraulic systems. Approximately 2 hours into the flight an ECAM alert indicated green system pressure low. ECAM hydraulic page indicated lower than normal green system quantity and pressure. All ECAM procedures and checklists were completed and system references were checked. ECAM subsequently alerted of green system low quantity. Dispatch and maintenance were contacted. The situation was discussed in detail and the decision was made to divert to a nearby airport. ATC; passengers and cabin crew were advised and an emergency was declared. Dispatch and operations were advised that the flight would need customs service at the diversion airport and possibly a tow off of the runway. Due to loss of green system; ECAM and QRH procedures were followed in order to manually lower the landing gear. The successful gear extension was followed by a normal landing. Nose wheel steering was effective and the aircraft cleared the runway. After emergency responders inspected outside of aircraft for hot spots; aircraft was taxied to a gate to clear customs and undergo repairs. Mechanical irregularities were written up in the log book.contract maintenance had failed to notice that; after they had completed their maintenance action; fluid was leaking from the green system reservoir. Contract maintenance would be instructed to observe hydraulic lines for some time period after maintenance to ensure that no leaks are occurring.

Original NASA ASRS Text

Title: An A321 flight crew were confronted with low yellow and green hyrdualic system quantities enroute following maintenance action at their departure airport. After draining excess fluid from the systems; Maintenance personnel had failed to insure that there was no leakage from the reservoirs.

Narrative: Prior to departure Contract Maintenance had removed some fluid from [the previously] over serviced Green and Yellow hydraulic systems. Approximately 2 hours into the flight an ECAM Alert indicated Green System Pressure Low. ECAM hydraulic page indicated lower than normal Green System quantity and pressure. All ECAM procedures and checklists were completed and system references were checked. ECAM subsequently alerted of Green System low quantity. Dispatch and Maintenance were contacted. The situation was discussed in detail and the decision was made to divert to a nearby airport. ATC; passengers and cabin crew were advised and an emergency was declared. Dispatch and Operations were advised that the flight would need Customs Service at the diversion airport and possibly a tow off of the runway. Due to loss of Green System; ECAM and QRH procedures were followed in order to manually lower the landing gear. The successful gear extension was followed by a normal landing. Nose wheel steering was effective and the aircraft cleared the runway. After emergency responders inspected outside of aircraft for hot spots; aircraft was taxied to a gate to clear customs and undergo repairs. Mechanical irregularities were written up in the log book.Contract Maintenance had failed to notice that; after they had completed their maintenance action; fluid was leaking from the Green System Reservoir. Contract Maintenance would be instructed to observe hydraulic lines for some time period after maintenance to ensure that no leaks are occurring.

Data retrieved from NASA's ASRS site as of July 2013 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	1003163
Time
Date	201204
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	A321
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Hydraulic System
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Maintenance

An A321 flight crew were confronted with low yellow and green hyrdualic system quantities enroute following maintenance action at their departure airport. After draining excess fluid from the systems; maintenance personnel had failed to insure that there was no leakage from the reservoirs.