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  TB 1--1520--238--20--138
8.
Inspection Procedures.
a. Safe helicopter IAW TM 1--1520--238--23 and 1--1520 Longbow/Apache IETM.
NOTE
*Inspect nickel supplemental abrasion strip using tapping hammer or equivalent.
Satisfactory bonding sounds high and hard, voids/debonds sound heavy without
resonance.
b. TAIL ROTOR -- SUPPLEMENTAL ABRASION STRIP INSPECTION CRITERIA.
NO
REF
CHARACTERISTIC
INSP METHOD
REQUISITE
LET
1
A
Scratches, nicks, and
Visual
Acceptable without perforation of Nickel.
gouges
Refer to baseline blade inspection crite-
ria in unshielded areas.
2
A
Erosion damage
Visual
Acceptable without perforation of Nickel.
Refer to baseline blade inspection crite-
ria in unshielded areas.
3
A
Dents
Visual
Smooth rounded dents are acceptable
to maximum dimension shown in TM
1--1520--238--23 and TM 1--1520 Long-
bow/Apache. Refer to baseline blade
inspection criteria in unshielded areas.
4
A
Voids/Debonds
Coin Tap Test*
Small voids/debonds (one inch square
maximum) that do not extend to the trail-
ing edge of the strip are acceptable.
5
A
Edge Voids/Debonds
Coin Tap Test*
No defects allowed.
and Visual
2
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