TB 1-1520-240-20-148
Inspection Procedures.
NOTE
Supplemental information for this message can be viewed at
"www.redstone.army.mil/sof/suppl/c47s0206.pdf".
a. Conduct records review (DA Form 2408-16 and DA Form 2408-5-1) and visual inspection (serial
number verification) of all combining transmissions prior to next engine start.
NOTE
One-time flights are not authorized for the following serial numbered
combining transmissions without written authorization from the technical
point of contact. One-time flights authorizations may be approved
dependent upon special inspection results as directed by the technical
point of contact.
b. The following serial numbered combining transmissions are considered unservicable: A8-017,
A8-066, A8-069, A8-117, A8-125, A8-152, A8-161, A8-173, A8-197, A8-232, A8-267, A8-363, A8-403,
A8-463, A8-563, A8-583, A8-654, A8-685. If the serial number is contained in the preceding list, clear the
entry from paragraph 1a and make the following entry on the DA form 2408-13-1. Enter a red //X// status sym-
bol with the following statement: "Combining transmission unserviceable IAW CH-47-02-06 (TB
1-1520-240-20-148)". Proceed to paragraph 9a.
NOTE
For aircraft away from home station, a one-time flight, not to exceed four
hours, with intermediate stops, is authorized to return to the nearest
secured maintenance facility/home station that will facilitate
inspection/repairs. This authorization does not apply to the serial
numbered combining transmissions listed in paragraph 8b.
c. For combining transmissions not listed above, if last overhaul was performed at CCAD and was
overhauled between 28 June 2000 and 17 June 2002, conduct visual inspection of the main, auxiliary, inlet
screen, and engine transmission oil filters on the combining transmissions for plastic media blast particles.
(1) If plastic media blast particles are found, the combining transmission is considered unservice-
able. Proceed to paragraph 9a.
(2) If no plastic media blast particles are found, the inspection is complete. Proceed to paragraph
d. If last overhaul was not performed at CCAD or was performed at CCAD prior to 28 June 2000, com-
bining transmission is considered serviceable.
e. Combining transmissions overhauled by CCAD after 17 June 2002 are considered servicable and
not affected by this message.
Correction Procedures.
a. If the combining transmission is considered unserviceable in accordance with paragraph 8 of this
message, proceed as follows --
(1) Replace combining transmission in accordance with appropriate TM prior ro next engine start.
(2) Replace 2 (two) filters (TM 55-1520-240-23P, figure 194, item 2) prior to installation of the new
combining transmission.
NOTE
Normal procedures require filters and packings to be replaced when
removed. this message authorizes a one-time re-use after inspection of
the filter and packing.
b. If no plastic media blast particles are found, the inspection is complete. Reinstall filters and clear
the red horizontal dash //--// entry from paragraph 1a.
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