The plus or minus 10 percent tolerance window referenced in TM
1--1500--328--23 is not applicable for this inspection. Align these inspections with
phase inspections when possible. Tail Rotor blades with 250 flight hours since last
inspection are not released for flight until radiographs have been evaluated and
results are received. Tail Rotor Blades inspected with less than 250 flight hours
since last evaluated inspection , may continue to fly until the X--rays have been
approved, but will not exceed 250 flight hours since last evaluated inspection or
250 hours Time Since New (TSN) for blade serial numbers C12--B052 and subse-
c. Tail Rotor Blades (0 TSN) with serial numbers C12--B052 and subsequent, must complete the initial
X--ray inspection at or before 250 flight hours TSN. An initial X--ray inspection prior to installation is not re-
d. Visual Inspection --
(1) Every 250 hours, visually inspect the doublers and spars, both front and back side in the tran-
sition area and around the rivets for crazing (appearance of paint cracks) and/or delaminations using a 10x
(a) If no crazing or delamninations are found, visual inspection is complete.
(b) If crazing is found in the transition area, inspect/repair IAW paragraph 9.
(c) If crazing is found around the rivets, contact the technical POC in paragraph 16a.
(d) If delamination is found, replace tail rotor blade. Submit Cat I QDR. Contact technical
(2) Units will use this TB as authority to use their 800 inspection numbers for the new 250 hour
visual inspection and AMB A/D 01--06 inspection on the DA 2408--18.
(a) Delete the old 125 hour AMB A/D 01--06 inspection.
(b) Create 4 new inspections (one for each blade by serial number) for the 250 hour visual
and AMB A/D 01--06 inspection.
(1) If one or more blades are removed from the aircraft, delete that blade's inspection from
DA Form 2408--18.Calculate the blade time remaining until next 250 hour inspection is due. Complete
DA Form 2410 copy 1. Enter time remaining until next 250 hour inspection in the remarks block. Enter
the date, aircraft serial number (S/N) , aircraft hours (when blade is removed), and the blade hours
remaining until the next 250 hour inspection is due on the DA Form 2408--5--1 for the blade .
(2) When a new/used blade is installed, add a new 250 hour inspection requirement based
upon the new blade serial number to the DA Form 2408--18. If the blade is not new, obtain the blade
time until the next 250 hour inspection from the DA Form 2408--5--1. Annotate the DA Form 2408--5--1
to show the date, aircraft serial number (S/N) , aircraft hours (when blade was installed). Complete
a DA Form 2410, copy 3 and annotate the remarks block with the blade time until the next 250 hour
(c) Any time the blades are removed in order to comply with the inspection requirements,
units are required to complete a set of DA Form 2410. Copy 1 to show the removal of the blade, copy
2 to show NDI/Maintenance due, and copy 3 to show installation.
The use of alternate radiographic equipment must be approved by the NDI POC at para 16c.
Alternate radiographic equipment must meet the required 2T sensitivity requirements.