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Two line mechanics reported not seeing residual protective tape covering the pight engine pitot tube (P1)-EPR probe inlet after an engine water wash procedure was completed; resulting in an erp split between left and right engines on a B757-200 departing flight. Poor lighting; darkness; long duty hours and no 'remove before flight' streamers cited as contributing factors.
| Attributes | |
| ACN | 955926 |
| Time | |
| Date | 201106 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Engine Pressure Ratio Indicat |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Experience | Maintenance Technician 22 |
| Person 2 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Experience | Maintenance Technician 33 |
| Events | |
| Anomaly | Deviation - Procedural Published Material / Policy Deviation - Procedural Maintenance |
Narrative:
A water wash for the right-hand engine was accomplished [on a B757-200 aircraft]. After completion of wash; I inspected pitot probe and did not see tape covering pitot inlet during post engine close up. This was due to the lack of sufficient lighting and paperwork that does not specify to use 'remove before flight' streamers in lieu of just tape. Outbound crew reported EPR split. Inbound station removed residual tape and ran engines with no split. No damage to aircraft or engines. Poor lighting was a factor; along with poor paperwork not requiring the use of red 'remove before flight' streamers. I had been working long hours and I was on the clock for 13+ hours. We ran the engines at the specific EPR setting and did not see any EPR error. Suspect tape was partially left intact upon removal and was difficult to see under current lighting conditions.
Original NASA ASRS Text
Title: Two Line Mechanics reported not seeing residual protective tape covering the pight engine pitot tube (P1)-EPR probe inlet after an engine water wash procedure was completed; resulting in an ERP split between left and right engines on a B757-200 departing flight. Poor lighting; darkness; long duty hours and no 'Remove Before Flight' streamers cited as contributing factors.
Narrative: A water wash for the right-hand engine was accomplished [on a B757-200 aircraft]. After completion of wash; I inspected pitot probe and did not see tape covering pitot inlet during post engine close up. This was due to the lack of sufficient lighting and paperwork that does not specify to use 'Remove Before Flight' streamers in lieu of just tape. Outbound crew reported EPR split. Inbound station removed residual tape and ran engines with no split. No damage to aircraft or engines. Poor lighting was a factor; along with poor paperwork not requiring the use of red 'Remove Before Flight' streamers. I had been working long hours and I was on the clock for 13+ hours. We ran the engines at the specific EPR setting and did not see any EPR error. Suspect tape was partially left intact upon removal and was difficult to see under current lighting conditions.
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.