TB 1--1520--238--20--96
2. Task/Inspection Suspense Date. Not later than the next scheduled 125 hour strap pack inspection
IAW TB 1--1520--238--20--89 and AH--64--98--ASAM--04.
3.
4.
Summary of the Problem.
a. While performing the Flourecent Penetrant Inspection of the Strap Pack Outboard Bolt IAW TB
1--1520--238--20--89 (AH--64--98--ASAM--04), a second failure mode originating on the outer diameter (OD)
of the bolt was discovered. The current Fluorescent Penetrant Inspection is unable to detect this failure until
the crack propagates through the wall of the bolt to the Inner Diameter (ID). An ultrasound inspection capable
of detecting cracks originating on OD surfaces has been developed. Probe kits compatible with existing AVIM
ultrasound equipment are being fielded.
b. For manpower/downtime and funding impacts, see paragraph 12.
c. The purpose of this TB is to provide direction to conduct ultrasonic inspection of the Strap Pack Out-
board Bolt in addition to the Fluorescent Penetrant Inspection currently being accomplished IAW TB
1--1520--238--20--89 and AH--64--98--ASAM--04.
5.
End Items to be inspected. All AH--64 series aircraft.
Assembly Components to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
Head Rotary Wing
7--311411003--607
1615--01--245--3148
7--311411003--609
1615--01--249--3989
7--311411003--611
1615--01--306--6948
7--311411003--613 (FSP)
1615--01--306--6948
7--311411003--615
1615--01--334--4933
7--311411003--619 (FSP)
1615--01--306--6948
7--311411003--621 (FSP)
1615--01--461--6127
7--311411003--623
1615--01--461--6126
7.
Parts to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
Strap Assembly
7--311411146--5
1615--01--154--7076
7--311411146--7
1615--01--154--7076
Inspection Procedures.
NOTE
Civilian personnel performing this inspection shall be level 2 or higher ultrasound qualified.
Military performing this inspection must have successfully completed the non--destructive test-
ing and training course at Millington, TN or Pensacola, FL and have an additional skill identifi-
er (ASI) of N2, have been trained at the Fort Rucker Special Trainining Session for this inspec-
tion, or have been trained by a certified/qualified NDT specialist IAW the above requirements,
with support from the training CD--ROM.
a. At the next scheduled 125 hour Strap Pack Outboard Bolt Inspection, perform an ultrasound inspec-
tion in addition to the currently required Fluorescent Penetrant Inspection. Strap Pack Outboard Bolt Inspec-
tion (UT) procedures are contained in the Ultrasound Probe Kits previously fielded. Contact the NDI point
of contact in para 16c if these procedures are not available.
2
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