................................................................................. | Loose |Vibration in |Loose stanchions |As necessary | | Stanchions in |cruise/cockpit |in E/E bay | | | the Electrical |rumble | | | | Equipment Bay | | | | | | | | | ................................................................................. | Inboard |Vibration in climb |Inboard elevator |Replace the PCP | | Elevator PCP |from 17,999 to |PCP rod end |(AMM 27-31-07/201). | | Rod End |31,000 ft |bearing wear | | | Bearing Wear | | | | | | | | | ................................................................................. | Inboard Aileron|Vibration in |Looseness of |Replace the bearing/| | Inboard Hinge |cruise |inboard aileron |fitting (References | | Support | |inboard hinge |AMM 27-11-02/401, | | Looseness | |support |AMM 57-42-00/001, | | | | |OHM 57-51-81). | | | | | | ................................................................................. | Inboard aileron|Vibration in |Looseness of |Replace the bearing/| | Reaction Link |cruise |inboard aileron |fitting (Reference | | Bearing Wear | |reaction link |AMM 27-11-12/201). | | Fitting | |bearing or | | | Looseness | |support fitting | | | | | | |
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747-400 MAINTENANCE MANUAL
~............................................................................... | ITEM | DESCRIPTION | CAUSES | CORRECTIVE ACTION | .................................................................................
| Air condition- |Vibration at |Air conditioning |Inspect the latch |
| ing Access Door|10,000 ft with |bay access door |(AMM 52-48-01/601) |
| Latch Looseness|speed increasing |worn latch |Replace if |
| |from 250/300 kts | |necessary. |
| | | | |
................................................................................. | Fuel Tank Vent |Low frequency vi-|Inoperative vent |Replace the vent | | Float Valves |bration in climb |float valve |float valves | | |at 16,000 to | |(AMM 28-13-02/401). | | |30,000 ft. Fog from| | | | |fuel vent system. | | | | |Rumbling noise | | | | |evident. | | | | | | | | ................................................................................. | Nose Wheel |Moderate vibration |Nose wheel well |Inspect and replace | | Well Aft Door |after lift-off and |aft door looseness |(AMM 32-22-04/401). | | Looseness |prior to flap |caused by worn | | | |retraction |bushings and bolts | | | | | | |
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
~............................................................................... | ITEM | DESCRIPTION | CAUSES | CORRECTIVE ACTION | ................................................................................. | Nose Gear |Abnormal Nose Gear |Wheel/tire not |Replace affected | | Vibration |Vibration during |in balance |tires and wheels | | |takeoff and/or | |(AMM 32-45-02/401). | | |landing | | | | | | | | | | |Worn torsion links |Replace the nose | | | | |gear torsion links | | | | |(AMM 32-21-03/401). | | | | | | | | |Faulty steering |Inspect the steering| | | |metering valve. |metering valve | | | | |(AMM 32-51-04/601). | | | | | | | | |Torsional freeplay |Check torsional | | | | |free-play | | | | |(AMM 32-21-03/601). | | | | | | | | |Faulty nose gear |Replace the actuator| | | |actuator snubbing |(AMM 32-34-01/401). | | | |valve. | | | | | | | | | |Faulty nose gear |Inspect the nose | | | |snubber. |gear snubber | | | | |(AMM 32-45-05/201). | | | | | | | | |Loss of wheel |Inspect and torque | | | |bearing preload. |the wheel bearings | | | | |(AMM 32-45-02/401). | | | | | | .................................................................................
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