TB 1--1520--240--20--141
(2) On a suitable workbench, clean glass cover with isopropyl alcohol, TT-I-735 (or equivalent).
(3) Apply a 3/16-inch high by 1/16-inch wide piece of red tape (NSN 7510-00-550-7126 or equiva-
lent) at the 111 percent RPM range marking on the glass face of each rotor tachometer.
(4) Paint a white index mark not over 1/16 inch wide across the joint between the glass and the
case at the bottom of the center (6 o'clock) position using MIL-L-19537 white lacquer (or equivalent).
(5) Apply a coat of MIL-V-173 varnish (or equivalent) over the tape and allow to dry.
(6) Reinstall the rotor tachometers in the aircraft in accordance with TM 55-1520-240-23, Task
8-89.
(7) After completion of the modification of both rotor tachometers, the red diagonal \/\ and
circled red //X// entries will be cleared.
c. For all MH-47E Helicopters --
(1) A sortware change will be developed to incorporate the 111 percent maximum transient rotor
speed limit.
(2) After installation of the new avionics suite, the circled red //X// entries will be cleared.
10. Supply/Parts and Disposition.
a. Parts Required. Items cited in paragraph 6 may be required to replace defective items.
b. Requisitioning Instructions. Requisition replacement parts using normal supply procedures. All req-
uisitions shall use project code (CC 57-59) "X13" (X--Ray, One, Three).
NOTE
Project Code "X13" is required to track and establish a data base
of stock fund expenditures incurred by the field as a result of message
actions.
c. Bulk and Consumable Materials. The following materials will be required --
(1) Tape, pressure sensitive adhesive, color red, P/N L-T-90, NSN 7510-00-550-7126 (or equiva-
lent).
(2) Varnish, P/N MIL-V-173, (or equivalent), NSN 8010-00-180-6343.
(3) Lacquer, white, color no. 17925 (or equivalent), P/N MIL-L-19537 (or equivalent),
NSN 8010-00-935-6608.
(4) Alcohol, isopropyl, commercial grade, P/N TT-I-735 (or equivalent), NSN 6810-00-753-4993.
(5) Bolt, P/N 114R2162-1, NSN 5306-00-926-5684.
(6) Nut, self--lock, P/N MS21083N4, NSN 5310-00-903-8282.
(7) Bolt, P/N AN4H30A, NSN 5306-00-182-2022.
(8) Seal, P/N 114R2142-3, NSN 5330-00---913-0933.
(9) Seal, P/N 114RS215-1, NSN 5330-00-248-5142.
d. Disposition.
(1) If cracks are found in the tie bar asssenbly, disposition instructions will be provided upon re-
ceipt of the Category I Deficiency Report.
(2) Contact the Logistical point of contact in paragraph16b for disposition instruction for all other
tie bar assemblies that fail the inspections in accordance with paragraph 8 of this Technical Bulletin.
(3) If tie bar assembly TSN is equal to or more than 4800 hours, contact the Technical point of
e. Disposition of Hazardous Material. N/A.
5