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 1.  General_______
 A.  Two tasks are supplied in this procedure. The first task is to examine the nacelle/strut structure. The second task is to examine the pneumatic ducting.
 B.  The pressure relief doors are designed to open in order to protect the nacelle/strut structure from overpressurization. The nacelle/strut overpressurization might ouccur due to a ruptured pneumatic duct(s).
 C.  Also, the pressure relief doors might open if a condition occurs which may cause temporary or permanent distortion. Example conditions are as follows but not limited too:
 (1)  
Hard Landing

 (2)  
Severe Turbulance

 (3)  
Engine Vibration

 TASK 05-51-28-202-001
 2.  Examine the Nacelle/Strut Structure___________________________________
 A.  Procedure
 S 212-002
 (1)  Examine the nacelle/strut inner and outer surfaces for distortion, cracks, pulled rivets, and rivets which are not there.
 NOTE: Carefully examine the surfaces for discoloration
____ and/or flaking paint. This could be a sign of a ruptured pneumatic duct.
 TASK 05-51-28-202-003
 3.  Examine the Pneumatic Ducting
_____________________________
 A.  Procedure
 S 212-004
 (1)  Examine the hard ducts and flexible sense lines for cracks and tears.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 282-005
 (2) Inspect the clamps, nuts, and fastners for tightness.
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 ALL  ú ú 01 Page 202 ú Jun 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 EXCEEDING MAXIMUM NOSE LANDING GEAR TOWING ANGLE OR MAXIMUM TOWING LOAD
_______________________________________________________________________ (CONDITIONAL INSPECTION) - MAINTENANCE PRACTICES
________________________________________________
 1.  General
_______
 A.  The following procedure is required for an accidental turn of the nose landing gear greater than the maximum steering angle with torsion links attached, applying without deactivating the steering system, or towing more than the maximum towing loads.
 NOTE: Exceeding maximum steering angle with torsion links attached is
____
 also known as an oversteer.

 B.  If the towing angle is more than the 70° limit with the airplane above the maximum gross weight, the Phase II inspection should be done.
 C.  This inspection procedure is divided into two phases (Phase I and Phase II).
 (1)  
If the inspection during Phase I does not shown that damage has occurred, no more inspections are necessary.

 (2)  
If the Phase I inspection shows that damage has occurred, the Phase II inspection must be done.

 (3)  
The Phase I inspection must be completed prior to the Phase II inspection.

 D.  When the conditional inspection tells you to "examine" a component, look for these conditions (replace or repair components, if it is necessary).
 (1)  
Cracks

 (2)  
Pulled apart structure

 (3)  
Loose paint (paint flakes)

 (4)  
Twisted parts (distortion)

 (5)  
Bent components

 (6)  
Fasteners holes that become larger or longer

 (7)  
Loose fasteners

 (8)  
Fasteners that have pulled out or are gone

 (9)  
Delaminations

 (10)
 Misalignment

 (11)
 Interference

 (12)
 Hydraulic fluid leakage

 (13)
 Other signs of damage

 TASK 05-51-29-202-001
 2.  Phase I Inspection
__________________
 A.  References
 (1)  
AMM 09-11-00/201, Tow the Airplane

　
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