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A mechanic notices vortex control devices (vcd) on their cfm-56 engines were positioned on the outboard fan cowls of number 1 and number 2 engines; instead of on the inboard fan cowls; while preparing to dispatch their B737-300 from a heavy maintenance check (hmv). He missed the discrepancy earlier when he had signed-off the post heavy maintenance check walk-around.
| Attributes | |
| ACN | 957427 |
| Time | |
| Date | 201106 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Cowling |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
After a heavy maintenance check (hmc); aircraft was being released to reposition for paint. On the evening of the post maintenance walk-around; using maintenance job card XXX; step 6-D has you verify that the vortex control devices (vcd) are installed on the inboard fan cowlings. I saw the step; but was thinking about the kruger flap rub strips instead. I did not notice that the vortex control devices were in fact on the outboard fan cowl.during the maintenance check (mc); the fan cowlings were removed as part of the check. When they were reinstalled; the fan cowlings from the number 1 engine were switched with the number 2 engine; therefore putting the vortex control devices on the outboard side of both engines. This went unnoticed until we went to dispatch the aircraft; and as it turned into the sunlight we noticed that the sun cast a shadow on the right-hand outboard fan cowling. This caught our attention right away and we stopped the aircraft and brought it back to the hangar. A logbook entry was made to switch the cowlings to the correct engines. The aircraft never flew in this condition since the discrepancy was corrected before flight.
Original NASA ASRS Text
Title: A Mechanic notices Vortex Control Devices (VCD) on their CFM-56 engines were positioned on the outboard fan cowls of number 1 and number 2 engines; instead of on the inboard fan cowls; while preparing to dispatch their B737-300 from a Heavy Maintenance Check (HMV). He missed the discrepancy earlier when he had signed-off the Post Heavy Maintenance Check Walk-around.
Narrative: After a Heavy Maintenance Check (HMC); aircraft was being released to reposition for paint. On the evening of the post maintenance walk-around; using Maintenance Job Card XXX; Step 6-D has you verify that the Vortex Control Devices (VCD) are installed on the inboard fan cowlings. I saw the Step; but was thinking about the Kruger flap rub strips instead. I did not notice that the Vortex Control Devices were in fact on the outboard fan cowl.During the Maintenance Check (MC); the fan cowlings were removed as part of the Check. When they were reinstalled; the fan cowlings from the number 1 engine were switched with the number 2 engine; therefore putting the Vortex Control Devices on the outboard side of both engines. This went unnoticed until we went to dispatch the aircraft; and as it turned into the sunlight we noticed that the sun cast a shadow on the right-hand outboard fan cowling. This caught our attention right away and we stopped the aircraft and brought it back to the hangar. A logbook entry was made to switch the cowlings to the correct engines. The aircraft never flew in this condition since the discrepancy was corrected before flight.
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.