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747-400 MAINTENANCE MANUAL
 b)  If the DPI extension decal shows it is not the fourth (4th) occurance, do the IDG scavenge filter check as follows:
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747-400 MAINTENANCE MANUAL
 ~.............................................................................. | DPI EXTENSION | ................................................................................ | SCAVENGE FILTER | | | | CONDITION | IDG OIL CONDITION | ACTION | ................................................................................ |No visible magnetic or |No oil discoloration, |1. Drain the oil. | |non-metallic particles |no signs of over-| | |(See the steps to examine|heating or chemical |2. Replace the scavenge | |the scavenge filter for |contamination of the | filter (AMM 24-11-04/401).| |more data) |oil is not suspected | | | | |3. Service with oil | | | | (AMM 12-22-07/301). | ................................................................................
 |No visible magnetic or |Oil discoloration, |non-metallic particles |signs of overheating |(See the steps to examine|or chemical |the scavenge filter for |contamination of the |more data) |oil is suspected | |(Hydraulic fluid | |and water) | | | | | | | | | | | | | | | | | | | | | | | | | | |1. Drain the oil. || ||2. Replace the scavenge || filter (AMM 24-11-04/401).|| ||3. Service with oil || (AMM 12-13-07/301). || ||4. Run the engine until the || IDG oil temperature is || 175 degrees F. || ||5. Drain the oil. || ||6. Replace the scavenge || filter (AMM 24-11-04/401).|| ||8. Service with oil || (AMM 12-13-07/301). || |
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747-400 MAINTENANCE MANUAL
 ~.............................................................................. | DPI EXTENSION | ................................................................................ | SCAVENGE FILTER | | | | CONDITION | IDG OIL CONDITION | ACTION | ................................................................................ |No visible magnetic or |Oil discoloration, |1. Drain the oil. | |non-metallic particles |signs of overheating | | |(See the steps to examine|or chemical |2. Replace the scavenge | |the scavenge filter for |contamination of the | filter (AMM 24-11-04/401).| |more data) |oil is suspected | | | |(Fuel) |3. Replace the fuel/oil | | | | cooler (AMM 79-21-01/401).| | | | | | | |4. Service with oil | | | | (AMM 12-13-07/301). | | | | | | | |5. Run the engine until the | | | | IDG oil temperature is | | | | 175 degrees F. | | | | | | | |6. Drain the oil. | | | | | | | |7. Replace the scavenge | | | | filter (AMM 24-11-04/401).| | | | | | | |8. Service with oil | | | | (AMM 12-13-07/301). | | | | | ................................................................................ |Visible magnetic or |No oil discoloration, |1. Replace the IDG | |non-metallic particles |no signs of over-| (AMM 24-11-01/401). | |in the scavenge filter. |heating or chemical | | |The scavenge filter or |contamination of the | | |the scavenge filter o-|oil is not suspected | | |ring is not damaged. | | | |(See the steps to examine| | | |the scavenge filter for | | | |more data) | | | ................................................................................ |Visible magnetic or |Oil discoloration, |1. Remove the IDG | |non-metallic particles |Signs of overheating | (AMM 24-11-01/401). | |in the scavenge filter. |or chemical | | |The scavenge filter or |contamination of the |2. Flush the IDG oil system | |the scavenge filter o-|oil is suspected. | (AMM 12-22-07/301). | |ring is not damaged. | | | |(See the steps to examine| |3. Replace the IDG | |the scavenge filter for | | (AMM 24-11-01/401). | |more data) | | |
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