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 1.  General
_______
 A.  One task is supplied in this procedure. The task is landing gear departs hard surface conditional inspection.
 B.  When an airplane accidentally goes off a hard taxiway or runway, the brake equalizer rods on the wing and body landing gear must be examined for possible damage.
 NOTE: The inspection is most important if the slope of the taxiway
____
 or runway is greater than 20 percent.

 TASK 05-51-37-202-001
 2.  Landing Gear Departs Hard Surface Conditional Inspection
________________________________________________________
 A.  References
 (1)  
05-51-05/201, Hard Landing or High Drag/Side Load Landing Condition

 (2)  
12-21-01/301, Landing Gear

 (3)  
12-25-01/301, Exterior Cleaning

 B.  Procedure
 S 162-002
 (1)  
Clean the dirty areas of the airplane (Ref 12-25-01/301).

 S 212-003

 (2)  
Visually examine the airframe for general condition and serviceablility.

 S 212-004

 (3)  
Examine the landing gear brake equalizer rods and attach points, load sensor assembly, wheels, and tires carefully for damage. Also, examine the landing gear door for scraped, bent, broken, or punctured components.

 NOTE: If too high of loads are indicated, refer to
____ 05-51-05/201, High Drag/Side Load Landing.
 S 642-005
 (4)  Apply grease to all of the lubricated joints to remove any unwanted material (Ref 12-21-01/301).
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 05-51-37
 ALL  ú ú 01 Page 201 ú Jun 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 AIRFRAME VIBRATION CONDITION (CONDITIONAL INSPECTION) - MAINTENANCE PRACTICES
_____________________________________________________________________________
 1.  General
_______
 A.  One task is supplied in this procedure. The task is airframe vibration conditional inspection.
 B.  In the past, operators have experienced airframe vibration and have not been able to identify the cause of the vibration. This procedure supplies a list of known causes of airframe vibration and gives a description of when the vibration occurs. Also, the corrective action is listed in the table.
 C.  The items listed below have been identified as causes for airframe vibration:
 (1)  
Wheel/Tire imbalance

 (2)  
Loose stanchions in the electrical equipment bay

 (3)  
Inboard elevator PCP rod end bearing wear

 (4)  
Inboard aileron inboard hinge support looseness

 (5)  
Inboard aileron reaction link bearing wear or support fitting looseness

 (6)  
Air conditioning access door latch looseness

 (7)  
Fuel tank vent float valves

 (8)  
Nose wheel well aft door looseness

 (9)  
Nose gear vibration

 (10)
 Vibration felt from NLG after liftoff

 (11)
 Engine main fuel pump worn drive splines

 (12)
 Upper deck external door handles not fully closed

 (13)
 Main gear vibration

 (14)
 Loose filters for the underfloor recirculation fans.

 (15)
 Flap carriage spindle and ball screw actuator lubrication.

 (16)
 Gaps in the rudder seals.

 (17)
 Engine nacelle orbiting.

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 05-51-38
 ALL  ú ú 01 Page 201 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 TASK 05-51-38-202-001
 2. Airframe Vibration Conditional Inspection
_________________________________________
 A. General ~............................................................................... | ITEM | DESCRIPTION | CAUSES | CORRECTIVE ACTION | .................................................................................
　
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