1.1 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 2.1 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 2.2 G (incremental 1.2 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 2.2 G.
(c)
If the landing is also overweight, the Overweight Landing Inspection, not the Hard Landing Inspection, must be done.
C. High Drag/Side Load Landing/Off Runway Excursion
(1) The hard landing or high drag/side load or off runway excursion conditional inspection should be initiated whenever one or more of the following occurs:
(a)
The airplane skids or overruns from the prepared surface onto an unprepared surface.
(b)
The airplane lands short of the prepared surface.
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05-51-51
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A 737-300/400/500MAINTENANCE MANUAL
(c)
The airplane makes a landing which involves the blowing of two or more tires.
(d)
The airplane skids on the runway such that damage of the airplane is suspected.
D. When the conditional inspection tells you to examine a component or area, look for these conditions (replace or repair components, if necessary).
(1)
Cracks
(2)
Creases or cracks in the skin or web
(3)
Skin wrinkling that crosses a line of fasteners
(4)
Pulled apart structure
(5)
Loose paint (paint flakes)
(6)
Twisted parts (distortion)
(7)
Bent components
(8)
Fastener holes that have become larger or longer
(9)
Loose fasteners
(10)
Fasteners that have pulled out or are gone
(11)
Delaminations
(12)
Misalignment
(13)
Interference
(14)
Other signs of damage
E. Examinations are visual with minimum disassembly (without component removal) unless stated otherwise.
F. If a Nondestructive test (NDT) inspection is called out, or there is damage to the bushings, fuse bolts, etc. and Nondestrutive testing is required, perform the tests in accordance to the Standard Overhaul Practices Manual (SOPM) 20-20-01.
TASK 05-51-51-202-001
2. Phase I Inspection
__________________
A. Main Landing Gear Areas
S 212-002
(1) If the following inspections are being done after an off-runway excursion, do the steps that follow:
(a)
Do a thorough washing of the gear with wheels and brakes removed.
(b)
The gear must be cleaned of debris, especially under axle sleeves and in bearings, and then thoroughly relubricated before return to service.
(c)
All wheel/tire assemblies should be replaced when possible contamination of wheel bearings from water, dirt or mud.
(d)
All gear wheel speed transducers should be removed and inspected.
(e)
Ensure brakes operate (AMM 32-41-41/601).
S 212-022
(2) Examine the main landing gear areas as follows (Fig. 201, Fig. 202, Fig. 203, Fig. 204, and Fig. 205):
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