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05-51-38
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ú 01 Page 204
ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
~............................................................................... | ITEM | DESCRIPTION | CAUSES | CORRECTIVE ACTION | .................................................................................
| Engine Main |Vibration |Monitor engine and |Replace the fuel |
| Fuel Pump |experienced during |listen for |Pump |
| Worn Drive |cruise followed by |ratcheting noise |(AMM 73-11-01/401 |
| Splines |spooldown of |in vicinity of |All engine |
| |engine |main fuel pump. |modules). |
| | |Check for worn | |
| | |main drive splines | |
| | |in pump. | |
| | | | |
................................................................................. | Upper deck |Vibration after |Door handle jammed |Make sure that all | | external door |takeoff in climb |out of position |doors are correctly | | handles not |and cruise. |which puts the |closed. | | fully closed. | |handle into the | | | | |airstream. | | | | | | | ................................................................................. | Main Gear |Abnormal main gear |Faulty gear |Test the gear | | Vibration |vibration during |retract braking |retract braking | | |take-off or | |system | | |landing. Possible | |(AMM 32-41-00/501). | | |main cabin | | | | |vibration at doors |Loss of wheel |Inspect and torque | | |4L/4R. |bearing preload |the wheel bearings | | | | |(AMM 32-45-01/401). | | | | | | | | |Uneven tire wear/ |Replace affected | | | |tire out of round |tires and wheels | | | | |(AMM 32-45-01/401). | ................................................................................. | Loose Filters |Buzzing and high |Filters are |Replace the filter | | for the |frequency |loose in their |boxes and filter | | Underfloor |vibration coming |trays. |trays with ones | | Recirculation |from the under-| |that have shock | | Fans. |floor recirculation| |mounts. | | |fan filters in the | |(Ref SB 747-21-2352)| | |floor area forward | | | | |of the main deck | | | | |door number 3. | | | ................................................................................. | Flap carriage |Airframe vibration |Flap carriage |Lubricate the flap | | spindle and |from takeoff |spindles and |carriage spindles | | ball screw |until flap |ball screw |and the ball screw | | actuator |retraction. |actuators |actuators. | | lubrication. | |lubrication. |(AMM 12-21-20/301) | | | | | | 2..................…...................…...................…....................1
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
05-51-38
ALL ú ú 01 Page 205 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
OVERWEIGHT LANDING CONDITION - MAINTENANCE PRACTICES
____________________________________________________ (CONDITIONAL INSPECTION)
________________________
1. General_______
A. Two tasks are supplied in this procedure. The first task is the phase I examination. The second task is the phase II examination.
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