757 MAINTENANCE MANUAL
 BIRD/HAIL STRIKE CONDITION - MAINTENANCE PRACTICES
__________________________________________________ (CONDITIONAL INSPECTION)
________________________
 1.  General_______
 A.  The examinations that follow are for a bird/hail strike condition. Examine the external surfaces of the airplane structure in the general area of the bird/hail strike. If the initial examination shows structural damage, then the internal structure must be inspected. Also inspect the hydraulic, pneumatic, and other systems in the area of the bird/hail strike for damage. The procedures that follow are made for the airplane structure in general. But, the examinations can be confined to the general area of the bird/hail strike.
 B.  This inspection is provided by these two tasks:
 (1)  Bird/Hail strike conditional inspection (in flight).
 C.  For allowable hail damage, refer to the analysis and continued service of airplanes with on-ground hail damage (SRM 51-10-04).
 TASK 05-51-18-212-001
 2.  Bird/Hail Strike Conditional Inspection_______________________________________
 A.  References
 (1)  
27-51-00/201, Trailing Edge Flap System

 (2)  
27-81-00/201, Leading Edge Flap System

 (3)  
71-11-00/601, Engine Cowling

 B.  Bird/Hail Strike Conditional Inspection
 S 862-002
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE FLAP/SLAT ACTUATION
_______ SYSTEMS. INJURY TO A PERSON OR DAMAGE TO EQUIPMENT CAN OCCUR IF THE FLAPS/SLATS MOVE. FLAP/SLAT ACTUATION SYSTEMS MUST NOT BE OPERATED DURING THIS INSPECTION. FAILURE TO OBEY CAN CAUSE INJURY TO PERSONS.
 (1)  
Do the deactivation procedure for the leading edge slat system (Ref 27-81-00).

 S 862-003

 (2)  
Do the deactivation procedure for the trailing edge flap system (Ref 27-51-00).

 S 212-004

 (3)  
Do the examinations that follow:

 (a)  Examine the wing, nacelle strut, and the horizontal and vertical stabilizer leading edge fairing. Look for displacement, distortion, fastener hole elongation or tearout, and paint that has flaked. Also look for skin cracks, and fasteners that have pulled out or are not there.
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757
MAINTENANCE MANUAL

 (b)  
Examine the strut panels, doors, and structure for buckling, cracks, and fasteners that have pulled out or are not there.

 (c)  
Examine the wing leading and trailing edge structure, panels, and doors. Look for displacement, distortion, paint that has flaked, cracks, and fasteners that have pulled out or are not there. Also examine the two sides of the honeycomb panels for cracks, delamination, soft spots and core damage.

 (d)  
Examine the leading edge slat mechanism and track fairing links. Look for distortion, cracks, misalignment, or other signs of distress.

 (e)  
Examine the trailing edge flap mechanism and track fairing links. Look for distortion, cracks, misalignment, or other signs of distress.

 (f)  
Examine the control surfaces. Look for binding, too much play, misalignment, distortion, or displacement of skins. Also look for fasteners that have pulled out or are missing.

 (g)  
Examine the nose landing gear doors and linkage. Look for distortion, cracks, and other signs of distress.

 (h)  
Examine the main landing gear doors and linkage. Look for distortion, cracks, and other signs of distress.

 (i)  
Examine the pilots' windows for delamination, spalling, or cracks. Also examine the adjacent structure for distortion, cracks, and fasteners that have pulled out or are not there.

 (j)  
Examine the forward-body nose section "eyebrow" area above the windows and radome. Look for cracks, distortion, delamination, misalignment, and displacement of the skins. Also look for fasteners that have pulled out or are not there.

 (k)  
Examine the internal and external areas of the radome. Look for honeycomb damage and for soft spots.

 S 212-006
　
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