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A line mechanic reports about the lack of specific orientation of spacers and gasket for cargo pit smoke detector assembly vacuum blowers in their B757-200 aircraft maintenance manual (amm) and illustrated parts catalog (ipc). Incorrect installation will restrict airflow and possible premature blower failure.
| Attributes | |
| ACN | 1058405 |
| Time | |
| Date | 201212 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Cargo Pit Compartment |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Reference MM 26-16-02-directs mechanic to 'put the spacers below the blower mounting pads'. Reference illustrated parts catalog (ipc) 26-16-01 items number 35 (spacer) and number 40 (gasket). Ipc item number 35 must be installed in a specific manner; as flipping it will restrict airflow; possibly causing the blower to fail prematurely. Item number 35 in the ipc is a spacer with a cutout in it to allow airflow through the spacer; but this is not specified in the MM or ipc installation instructions. [Recommend] providing clarification and clear graphic showing exactly how the item number 35 should be oriented under the blower; as currently there is no clear direction and incorrect installation is quite possible and easy to do; as the location is not easy to remove/replace (r/r) the [vacuum] blower; with limited access.[during] ETOPS pre-departure check.
Original NASA ASRS Text
Title: A Line Mechanic reports about the lack of specific orientation of spacers and gasket for cargo pit Smoke Detector Assembly vacuum blowers in their B757-200 Aircraft Maintenance Manual (AMM) and Illustrated Parts Catalog (IPC). Incorrect installation will restrict airflow and possible premature blower failure.
Narrative: Reference MM 26-16-02-directs Mechanic to 'put the spacers below the blower mounting pads'. Reference Illustrated Parts Catalog (IPC) 26-16-01 Items Number 35 (Spacer) and Number 40 (Gasket). IPC Item Number 35 must be installed in a specific manner; as flipping it will restrict airflow; possibly causing the blower to fail prematurely. Item Number 35 in the IPC is a spacer with a cutout in it to allow airflow through the spacer; but this is not specified in the MM or IPC installation instructions. [Recommend] providing clarification and clear graphic showing exactly how the Item Number 35 should be oriented under the blower; as currently there is no clear direction and incorrect installation is quite possible and easy to do; as the location is not easy to remove/replace (r/r) the [vacuum] blower; with limited access.[During] ETOPS pre-departure check.
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.