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A maintenance controller reports a discrepancy found in their aircraft maintenance manual (amm) 79-21-05 during an oil filter change on a pw-4000 engine for a B767-300 with an EICAS oil filter message. The amm illustration mistakenly associates the oil filter housing o-ring packing with the oil filter housing drain plug.
| Attributes | |
| ACN | 941064 |
| Time | |
| Date | 201103 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Oil Filter |
| Person 1 | |
| Function | Other / Unknown |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
Company B767-300 had [EICAS] oil filter message. Contract maintenance replaced filter and housing packing next day (no parts at station); [because they] had to be flown in. Aircraft maintenance manual (amm) 79-21-05 page xxa says to remove drain plug (16) and [O-ring] packing (13). [I] believe this is an amm error; because item (13) is for oil filter housing. Amm never states to remove drain plug [O-ring] packing (15). Contacted company engineering and they wrote an engineering order (east/O) to inspect current drain plug (15) [O-ring] packing and reuse if no defects found. Amm 79-21-10 page xxb; item 'east' was reviewed for same issue.
Original NASA ASRS Text
Title: A Maintenance Controller reports a discrepancy found in their Aircraft Maintenance Manual (AMM) 79-21-05 during an oil filter change on a PW-4000 engine for a B767-300 with an EICAS oil filter message. The AMM illustration mistakenly associates the oil filter housing O-ring packing with the oil filter housing drain plug.
Narrative: Company B767-300 had [EICAS] oil filter message. Contract Maintenance replaced filter and housing packing next day (no parts at station); [because they] had to be flown in. Aircraft Maintenance Manual (AMM) 79-21-05 page XXA says to remove drain plug (16) and [O-ring] packing (13). [I] believe this is an AMM error; because item (13) is for oil filter housing. AMM never states to remove drain plug [O-ring] packing (15). Contacted Company Engineering and they wrote an Engineering Order (E/O) to inspect current drain plug (15) [O-ring] packing and reuse if no defects found. AMM 79-21-10 page XXB; item 'E' was reviewed for same issue.
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.