TB 1-1520-240-20-106
(1) Wholesale Stock N/A.
(2) Retail Stock. Upon receipt of this message commanders and others maintaining retail stock
at installation level and below shall contact the supported aviation unit to perform the inspection required by
paragraph 8 and the correction procedures of paragraph 9 on discrepant materiel. Disposition of discrepant
materiel will be in accordance with paragraph 10.
g. Component/Parts in Work (Depot Level and Others). ltems listed in paragraph 6 which are in work
will not be issued until compliance with this message is complete.
2. Task/Inspection Suspension Date. Within next 10 flight hours/14 days.
4. Summary of the Problem.
a. An investigation of cracked rod ends on blade lag dampeners with elastromeric bearings revealed
that the rod ends had been adjusted to the length applicable to the older, teflon rod end bearings. lmproper
adjustment increases fatigue stresses which can cause the banjo portion of the rod end assembly to crack.
The lag dampeners were not properly identified by part number 114H6800-11 as required upon application
of MWO 1-1520-240-50-64 or upon maintenance action. The maintenance manuals require different ad-
justment lengths for the 9 and 11 lag dampeners. Without the correct part number identified on the part, incor-
rect adjustment lengths may have been applied to the lag dampeners.
b. For manpower/downtime and funding impacts, see paragraph 12.
c. The purpose of this message is to:
(1) Perform a one-time inspection of lag dampeners with elastomeric bearings for improper ad-
justment.
(2) Emphasize that the correct rod end adjustment is applied during maintenance actions of all
dampeners.
5. End Items to be Inspected. All CH-47D, MH-47D and MH-47E aircraft.
6. Assembly Components to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
114H6800-5
Lag Dampener Assembly
114H6800-9
Lag Dampener Assembly
114H6800-11
Lag Dampener Assembly
7. Parts to be Inspected. N/A
8. Inspection Procedures.
a. Prepare aircraft for safe ground maintenance.
b. Inspect each of the six (6) rotor lag dampener assemblies for outboard elastomeric rod end bearings.
If the dampener has teflon bearings on both ends and is identified as 114H6800-5 it is serviceable. No further
action is required for this dampener assembly.
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