(23) WING RIB ASSEMBLY W.S. 49.25 INSPECTIONS.
The left and right rib assemblies, factory installed in PA-32R-300’s, aft of the main spar at
W.S. 49.25 can, under certain conditions, crack. The cracking is typically observed vertically
along the bend radius of the flange common to the main spar and the main landing gear side
brace attach fitting (see Figure 3-20). Accordingly, in PA-32R-300’s only, perform the
following inspections at the intervals indicated:
NOTE: Installation of Kits No. 767-397 (LH) and 767-398 (RH), confirmation of existing rib
assemblies stamped with Date Code 8313 (see Figure 3-22) or higher (i.e. -
manufactured circa July 2005 or later), installation of new rib assemblies with Date
Code 8313 or higher, or any combination of the above will eliminate the following
100 hour and 500 hour repetitive inspection requirements.
(a) 100 Hour Wing Rib Inspection
In PA-32R-300’s only, for airplanes which have not installed Piper Kits No. 767-397 (LH)
and 767-398 (RH) or do not have wing rib assemblies at W.S. 49.25 stamped with Date
Code 8313 (see Figure 3-21) or higher (i.e. - manufactured circa July 2005 or later):
each
100 hours or annually, whichever comes first, time-in-service:
1
Place the airplane on jacks per Section II.
2
In both the right and left wings:
a
Inspect the Aft Rib Assembly at W.S. 49.25 for any evidence of cracks (see
Figure 3-20.)
b
Inspection shall be limited to a visual examination.
c
Inspect the exposed (upper half) portion of the bend radius of the flange
common to the Aft Rib Assembly and the Main Spar Web.
3
If any crack is detected visually, proceed to a more detailed examination.
a
Remove the Main Landing Gear Side Brace, by removing the five (5) bolts that
fasten it to the wing structure. Retain hardware for reassembly.
b
Inspect the cracked Rib Assembly in the bend radius of the flange common to
the Main Spar Web, using dye penetrant inspection techniques, to determine the
full extent of crack propagation.
c
Determine if trimming, as shown in Figure 3-20, will remove all the material
affected by the crack.
[1] If so, install the appropriate kit (see above).
[2] If this cannot be accomplished, replace the cracked Rib Assembly.
4
If no cracks are detected, reassemble/reinstall any parts or components previously
removed.
5
Verify proper functioning of landing gear.
6
Verify gear are down and locked and remove airplane from jacks.
7
Make an appropriate logbook entry.
PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
III - INSPECTION
07/15/06
4F18
Summary of Contents for Cherokee LANCE
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