TB 1--1520--237--20--217
paragraph 8 and the correction procedures of paragraph 9 on discrepant materiel. Report compliance with
this TB IAW paragraph 14.d.(2).
g. Component/Parts In Work (Depot Levels and Others). Items listed in paragraph 6 in work will not
be issued until compliant with this TB.
2.
Task/Inspection Suspense Date. Within next 10 flight hours/14 days.
3.
4.
Summary of the Problem.
a. During a CAT 1 EIR analysis, a Primary Servo piston was found to be fractured. The fracture was
caused by a vendor using an electric ARC pencil to mark the serial number on the piston during overhaul.
At that time a total of 22 blackhawk servo assemblies were suspect and UH--60--94--ASAM--09 was published
to located the suspect servos. To date, nine (9) suspect servos assemblies have not been turned in for inspec-
tion and repair as required by the ASAM.
b. For manpower/downtime and funding impacts, see paragraph 12.
c. The purpose of this TB is to located and remove specific serial number servo assemblies for inspec-
tion and repair.
5.
End Items to be inspected. All H--60 aircraft.
6.
Assembly Components to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
Primary Servo Assembly
70410--02820--054
1650--01--143--1226
7.
Parts to be Inspected. N/A.
8. Inspection Procedures. Visually inspect each Primary Servo Assembly for serial number. If the servo
assembly is not one of the following serial numbers the inspection is complete. If one of the following serial
numbers is found, check for "B" suffix added to the end of the serial number. "B" suffix indicates that the servo
has already been reworked, and is not suspect. Do not confuse "B" prefix, which is common, with "B" suffix.
"B" prefix appears at beginning of serial number and indicates manufacturer. "B" suffix, if present, appears
at the end of the serial number, and indicated rework has been performed by Parker--Bertea. If the servo as-
sembly is one of the specified serial numbers and does not have a "B" suffix, proceed to paragraph 9 for
correction. If the servo assembly is one of the specified serial numbers and has the "B" suffix, inform the Logis-
tical point of contact of the inspection results via email or fax within 48 hours of the inspection and the inspec-
tion is complete.
SERIAL NUMBER
SERIAL NUMBER
B303--00045
B303--02527
B303--02745
B303--00089
B303--03066
B303--00640
B303--03384
B303--00756
B303--05915A
9. Correction Procedures. Remove the affected Servo Assembly from service within 30 days or 50 flight
hours, which ever comes first, and replace with a serviceable assembly. Aircraft shall be carried on a horizon-
tal red dash // -- // until the identified Servo Assembly is replaced.
10. Supply/Parts and Disposition.
2
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