Narrative:

I was assigned to work an A319 aircraft and to replace the 10th stage high pressure compressor (hpc) valve and the hpc 10th stage solenoid valve. I replaced the solenoid valve using MM 75-32-53. The maintenance manual (MM) reference for the solenoid valve showed two valves on a mounting bracket. There were actually four valves on the bracket. I assumed that only two of the four valves were shown to convey the relative position of 10th stage solenoid valve on the bracket. I replaced the solenoid valve and moved on to the next task.lower on the engine is another mounting bracket with only one valve mounted on it. This valve is the 10th stage hpc solenoid valve. I did not notice it. On this engine there is only one valve installed on this bracket; not two as illustrated in the MM. As it turned out; I replaced the correct part in the wrong position. I replaced the the 7th stage solenoid valve with the 10th stage solenoid valve. All five valves are physically identical.when filling out the installation/removal (ir) tag; I noticed the part numbers between the valve I removed and the one I installed were different by one digit. The stores part number was for the 10th stage solenoid valve to be replaced; was correct. I started to become concerned that I may have replaced the wrong part.at this point I wasn't quite sure that I had; so I started researching the MM and illustrated parts catalog (ipc); browsing through our maintenance computer. I found a reference MM 75-32-51; for changing the 7th stage solenoid valve. I noticed figure 402; which showed three valves on a mounting bracket and not 4; which led to more confusion and concern. I found figure 401; which showed the solenoid valve positions in a block diagram.

Google
 

Original NASA ASRS Text

Title: A Line Mechanic reports on the difficulty and confusion in determining the correct location of a 10th Stage High Pressure Compressor (HPC) Solenoid valve for an A319 aircraft with V2500 engines. The Maintenance Manual (MM) Figures referenced in their Engineering Job Card were incorrect.

Narrative: I was assigned to work an A319 aircraft and to replace the 10th Stage High Pressure Compressor (HPC) valve and the HPC 10th Stage Solenoid valve. I replaced the Solenoid valve using MM 75-32-53. The Maintenance Manual (MM) reference for the Solenoid valve showed two valves on a mounting bracket. There were actually four valves on the bracket. I assumed that only two of the four valves were shown to convey the relative position of 10th Stage Solenoid valve on the bracket. I replaced the Solenoid valve and moved on to the next Task.Lower on the engine is another mounting bracket with only one valve mounted on it. This valve is the 10th Stage HPC Solenoid valve. I did not notice it. On this engine there is only one valve installed on this bracket; not two as illustrated in the MM. As it turned out; I replaced the correct part in the wrong position. I replaced the the 7th Stage Solenoid valve with the 10th Stage Solenoid valve. All five valves are physically identical.When filling out the Installation/Removal (IR) Tag; I noticed the Part Numbers between the valve I removed and the one I installed were different by one digit. The Stores Part Number was for the 10th Stage Solenoid valve to be replaced; was correct. I started to become concerned that I may have replaced the wrong part.At this point I wasn't quite sure that I had; so I started researching the MM and Illustrated Parts Catalog (IPC); browsing through our Maintenance Computer. I found a reference MM 75-32-51; for changing the 7th Stage Solenoid valve. I noticed Figure 402; which showed three valves on a mounting bracket and not 4; which led to more confusion and concern. I found Figure 401; which showed the Solenoid valve positions in a block diagram.

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.