The reference A320 minimum equipment list procedure called for the high pressure pneumatic line to b...

Attributes
ACN	1034156
Time
Date	201208
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Hydraulic System Lines Connectors Fittings
Person 1
Function	Technician
Person 2
Function	Technician
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural MEL Deviation - Procedural Published Material / Policy

Narrative:

While troubleshooting [an airbus 320] yellow [hydraulic] system accumulator [deferral]; it was found to be not accomplished properly. I then began to test the system per amm 29-13-42 and at approximately 1;820 psi; as I was looking at the pressure gauge; something in the system let loose and sprayed me in the face and side. I was able to get out of the area without any damage but could have been much worse. What we ended up finding out; not only was the accumulator damaged due to not doing the MEL procedure properly; it caused damage to the yellow system reservoir; yellow system pump; and check valve.

Original NASA ASRS Text

Title: The reference A320 Minimum Equipment List procedure called for the high pressure pneumatic line to be disconnected from the reservoir to prevent pressure from acting upon the system. The technicians reported that this line was found to be connected; which may have caused additional damage.

Narrative: While troubleshooting [an Airbus 320] Yellow [Hydraulic] System accumulator [deferral]; it was found to be not accomplished properly. I then began to test the system per AMM 29-13-42 and at approximately 1;820 PSI; as I was looking at the pressure gauge; something in the system let loose and sprayed me in the face and side. I was able to get out of the area without any damage but could have been much worse. What we ended up finding out; not only was the accumulator damaged due to not doing the MEL procedure properly; it caused damage to the yellow system reservoir; yellow system pump; and check valve.

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.

The reference A320 minimum equipment list procedure called for the high pressure pneumatic line to be disconnected from the reservoir to prevent pressure from acting upon the system. The technicians reported that this line was found to be connected; which may have caused additional damage.