TB 1-1520-238-20-117
Parts to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
Blade, rotary rudder
7--311422050--5, --7
1615--01--312--2387
Blade, rotary rudder
7--311422050--3
1615--01--154--7139
Blade, rotary rudder
7--311422050--3A
1615--01--441--6249
Blade, rotary rudder
7--311422050--5A, --7A, --9A
1615--01--441--6248
Inspection Procedures.
NOTE
FOLLOW--ON INSPECTION PROCEDURES WILL BE DEVELOPED AND A
SUBSEQUENT SAFETY OF FLIGHT MESSAGE WILL FOLLOW.
a. Conduct records check of DA Form 2408--16 to determine the number of hours time since new (TSN)
of the tail rotor blades. Conduct visual inspection of tail rotor blades to confirm the serial numbers annotated
on the DA Form 2408--16. Any blades that do not match the DA Form 2408--16 will upgrade the affected
aircraft to status symbol red "X" pending future inspection procedures.
b. If the TSN is 1000 hours or greater, enter a red "X" and the following write up on the DA Form
2408--13--1, "Aircraft grounded pending future inspection procedures TBD". Proceed to paragraph 9.
c.
If the TSN is less than 1000 hours, the red horizontal "--" entry may be cleared.
Correction Procedures.
a. If the TSN on the tail rotor blade is 1000 hours or greater, the aircraft is grounded until the blade
is replaced or inspection procedures are implemented.
NOTE
IF ENTIRE CROSSHEAD ASSEMBLY IS REMOVED, UNITS WILL ENSURE THAT
WHEN INSTALLING THE TAIL ROTOR FORK ASSEMBLY, THAT THEY ARE US-
ING THE MOST CURRENT TAIL ROTOR INDEXING PROCEDURES AS LISTED
IN TB 1--1520--238--30--15, DATED 30 JUNE 1999 AND/OR TM 1--1520--238--23--3,
CHANGE 5, OR CURRENT VERSION OF LONGBOW IETM.
b. Change the DA Form 2408--16, block 6J, to reflect the interim life limit of 1000 hours TSN.
10. Supply/Parts and Disposition.
NOTE
HQDA WILL PRIORITIZE UNITS AND REPAIR PARTS DISTRIBUTION.
a. Parts Required. Items cited in paragraph 7 may be required to replace defective items.
b. Requisitioning Instructions. Do not requisition replacement parts IAW this TB. A follow--on message
will be issued once the inspection procedures are established.
c.
Bulk and Consumable Materials. IAW the appropriate technical manual.
d. Disposition. Hold any discrepant part/component pending disposition instructions IAW subsequent
message.
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