(a)  The Phase I inspection is applicable when a Hard Landing or a High Drag/Side Load Landing occurs.

 (2)  
If the inspection during Phase I does not show that damage has occurred, no more inspections are necessary.

 (3)  
If the Phase I inspection shows that damage has occurred, the Phase II inspection is necessary.

 TASK 05-51-05-212-099
 2.  Hard Landing or High Drag/Side Load Landing Conditional Inspection______________________________________________________________________
 A. Hard Landing Inspection Guidelines
 S 212-094
 (1)  
The hard landing procedure is for hard landings at or below the maximum design landing weight limits.

 S 212-095

 (2)  
The pilot must make a decision if a structural inspection is necessary.

 (a)  
For airplane flight data recording systems capable of at least eight (8) samples per second, the following can be used: An indication of a hard landing on the main landing gear is a peak recorded vertical acceleration that exceeds 1.7 G (incremental

 0.7 G). This vertical accelerometer data must be measured by the flight data recorder accelerometer at a data sampling rate of at least eight (8) samples per second. The peak recorded vertical acceleration for a hard landing that is a hard nose landing or is accompanied by more than two degrees of roll at the time of main landing gear impact can be significantly less than 1.7 G.

 (b)  
For airplane flight data recording systems capable of at least sixteen (16) samples per second, the following can be used: An indication of a hard landing on the main landing gear is a peak recorded vertical acceleration that exceeds 1.8 G (incremental 0.8 G). This vertical accelerometer data must be measured by the flight data recorder accelerometer at a data sampling rate of at least sixteen (16) samples per second. The peak recorded vertical acceleration for a hard landing that is a hard nose landing or is accompanied by more than two degrees of roll at the time of main landing gear impact can be significantly less than 1.8 G.

 (c)  
If the landing is also overweight, the Overweight Landing Inspection, not the Hard Landing Inspection, must be done.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 TASK 05-51-05-212-100
 3.  High Drag/Side Load Landing Conditional Inspection
______________________________________________________
 A.  High Drag/Side Load Landing Inspection Guidelines
 S 212-096
 (1)  A high drag/side load landing occurs if the airplane makes a landing with one or more of the conditions that follow:
 (a)  
The airplane skidded or overran the prepared surface.

 (b)  
The airplane made a landing short of the prepared surface.

 (c)  
The airplane made a landing and two or more tires were blown.

 (d)  
The airplane skidded on the runway sufficiently to make you think damage occurred.

 S 212-098
 (2)  When the conditional inspection tells you to "examine" a fuse pin, use one of these inspection methods:
 (a)  Fuse pin inner diameter distortion inspection, method number 1. 1) Access the fuse pin that is to be inspected. a) Remove all strut panels and doors, and open the nacelle cowlings (AMM 54-52-01/601). 2) Remove the bolt that goes through the fuse pin and the end caps of the fuse pin that is going to be inspected. 3) Clean the grease away from the inner diameter of the fuse pin.
 4)  Use a straightedge or an equivalent device and look for distortion of the inner diameter of the fuse pin. a) If you find damage in the upper link fuse pin, do the
 same inspection for the diagonal brace fuse pin (aft pin).
 (b)  
Fuse pin joint rotation inspection, method number 2. 1) Remove the load from the joint that has the fuse pin to be inspected. 2) Access the fuse pin that is to be inspected. a) Remove all strut panels and doors, and open the nacelle cowlings (AMM 54-52-01/601).

 3)  Rotate the fuse pin. If the fuse pin is free to rotate, no damage exists.

 (c)  
Fuse pin partial removal and binding inspection, method number 3. 1) Remove the load from the joint that has the fuse pin to be
　
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