TB 1--1520--240--20--114
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
GEAR/BEARING ASSY
145DS0106
3110-01-353-7369
GEAR/BEARING ASSY
145DS0108
3110-01-353-7369
GEAR/BEARING ASSY
145DS0116
GEAR/BEARING ASSY
145DS011-8
3110-01-232-7708
GEAR/BEARING ASSY
145DS011-9
3110-01-350-3674
GEAR/BEARING ASSY
145DS011-11
3110-350-3674
8.
Inspection Procedures.
a. Inspect the Forward and Aft Transmission DA Form 2408-16 Aircraft Component Historical Re-
cords.
b. If the Forward Transmission DA Form 2408-16 lists four 1st stage gear/bearing assemlbies with part
number 145DS011-6 or -8 with serial number prefix "VB" and six 2nd stage gear/bearing assemblies with part
number 145DS010-3 or -5 with serial number prefix "VB", that transmisssion is considered serviceable with
operating limitation as defined by paragraph 9.
c. If the aft transmission DA Form 2408--16 lists four 1st stage gear/bearing assemblies with part num-
ber 145DS011-6 or -8 with serial number prefix "VB" and six 2nd stage gear/bearing assemblieswith part num-
ber 145DS010-3 or -5 with serial number prefix "VB", that transmission is considered serviceable with operat-
ing limitation as defined by paragraph 9.
NOTE
All twenty forward and aft transmission gear/bearing assembly serial
numbers must begin with prefix "VB" for the aircraft to be considered ser-
viceable with the operating limitation as defined by paragraph 9.
d. If either transmission DA Form 2408--16 lists any gear/bearing asemblies with part number
145DS010-6 or -8 or 145DS011-9 or -11 or serial numbers with a "GG" prefix, the transmission is unservice-
able and the aircraft will remain on a red //X// condition status until the transmission is replaced with one which
has been inspected in accordance with SOF CH--47--99--03.
e. If a transmission DA Form 2408--16 does not identify all installed first or second stage gear/bearing
assemblies by serial number, the transmission is considered suspect and unserviceable and the aircraft will
remain on a red //X// condition status.Transmission build records are being obtained to determine if they are
serviceable. Contact logistical point of contact in paragraph 16b for build record information.
9.
Correction Procedures.
a. Transmissions which contain gear/bearing asemblies as identified in paragraphs 8b and 8c above
are considered serviceable with operating limitation. If two serviceable transmissions are installed on same
aircraft, the red "X" status symbol required by Safety of Flight message CH--47--99--02 shall be changed to
a circled red //X//.The circled red //X// entry shall state "Aircraft restricted to flight operations at a maximum
of 80 percent dual engine torque." Aircraft which exceed this limitation are authorized an immediate one time
flight to the nearest secure maintenance facility and the aircraft shall be placed on a red //X// condition status.
Caution
Immediate action must be taken to reduce stress when the cruise guide
indicator enters the red and yellow striped band (CH/MH--47D) or the red
band (MH--47E). This can be accomplished by lowering thrust control
lever, reducing airspeed, releasing back pressure on the cyclic stick, or
by reducing the severity of the maneuver. High load maneuvering condi-
tions may cause the 80 percent dual engine torque limit to be exceeded.
NOTE
To ensure torque reduction of both forward and aft transmissions, when
loading aircraft, attempt to maintain neutral center of gravity.
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