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 TB 1-1520-240-20-128
(b) Total of 12 hours downtime for one end item.
(3) For shaft replacemnt:
(a) Total of 36 man--hours using 3 persons.
(b) Total of 12 hours downtime for one end item.
c.
Estimated Cost Impact to the Field.
NOMENCLATURE
PN/NSN
QUANTITY
COST EACH
TOTAL
SHAFT,
145C3051-1/
1
$636.00
$636.00
SHOULDERED
PIN, COTTER
MS24665-376/
1
$.04
$.04
NUT, SELF--
MS17826-12/
1
$2.86
$2.86
LOCKING
WASHER, FLAT
NAS1149D1290K/
1
$.38
$.38
WASHER, RE-
NAS143-20C/
1
$.62
$.62
CESSED
BUSHING,
NAS75-20-206/
1
$12.02
$12.02
SLEEVE
3120-01-156-7812
TOTAL COST PER AIRCRAFT = $651.92
d.
TB/MWOs to be Applied Prior to or Concurrently with this Inspection. N/A.
e. Publications Which Require Change as a Result of this Inspection -- The following publications shall
be changed as noted below to reflect thisTechnical Bulletin. A copy of this Technical Bulletin shall be inserted
in the appropriate TM as authority to implement the change until the printed change is received.
(1) TM 55-1520-240-PM, CH--47D Helicopter Phase Maintenance Checklist. Add a requirement
to area #7, forward rotor, crown, and tunnel, to inspect for corrosion on the inside diameter of the forward yoke
shaft. This inspection shall be required at each phase maintenance inspection.
(2) TM 1-1520-252-PM, MH--47E/AWC Helicopter Phase Maintenance Checklist. Add a require-
ment to area #7, forward rotor, crown, and tunnel, to inspect for corrosion on the inside diameter of the forward
yoke shaft. This inspection shall be required at each phase maintenance inspection.
(3) TM 55-1520-240-23, Aviation Unit and Aviation Intermediate Maintenance Manual, CH--47D
Helicopter. Add a Task describing the visual inspection of the inside diameter of the forward yoke shaft. No
corrosion is allowed.
(4) TM 1-1520-252-23, Aviation Unit and Aviation Intermediate Maintenance Manual, MH--47E
Helicopter. Add a Task describing the visual inspection of the inside diameter of the forward yoke shaft. No
corrosion is allowed.
13. References.
a.
DA PAM 738--751, 15 MAR 99.
b.
TM 55--1520--240--23, Aviation Unit and Aviation Intermediate Maintenance Manual, CH--47D Heli-
copter.
c.
TM 1--1520--252--23, Aviation Unit and Aviation Intermediate Maintenance Manual, MH--47E Heli-
copter.
d.
TM 1--1500--328--23, Aeronautical Equipment Maintenance Policies and Procedures, 30 JUl 99.
4
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