TB 1-1520-210-20-35
f. Component/Parts in Stock Including War Reserves at All Levels (Depot and Others). N/A.
2. Task/Inspection Suspense Date. Within 20 hours or 30 days from receipt of original message or this
TB, whichever is received first.
3. Reporting Compliance Suspense Date. No later than 20 Oct 97 per paragraph 14.a. of this TB.
4. Summary of Problem.
a. ATCOM has received field reports citing failure of the Self-Sealing Break-Away Coupling connecting
the Oil Line from the Engine Scavenge Pump to the ODDS Lubriclone Fitter. The pins in the connector are
designed to shear in a crash sequence, but are wearing away prematurely. The pins fail when the wear
becomes excessive. The internal valve closes and shuts off the oil flow. Pressure in the Oil Line increases
and the hose has failed under certain circumstances. Most of the wear on the pins can be attributed to
normal aircraft vibration and side loading caused by the slight misalignment of the 90-Degree Coupling Half
at the Lubriclone Filter. Periodic inspection of these couplings is needed to prevent a failure during flight.
b. There is currently a shortage of 90-Degree Coupling Halves in supply. For the purpose of complying
with this message only, the use of a solid 90-Degree Tube Elbow is authorized to temporarily replace 90-
Degree Coupling Halves that fail the inspection. The solid 90-Degree Tube Elbow shall immediately be
replaced when a serviceable 90-Degree Coupling Half is obtained and installed.
c. For Manpower/Downtime and Funding Impacts, See Paragraph 12.
d. The Purpose of this TB is to require an inspection of the couplings, to establish a recurring
inspection to prevent future failures, and to provide a temporary solution to the supply shortage.
5. End Items to be Inspected. All UH-1H/V series aircraft equipped with ODDS.
6. Assembly Components to be Inspected. N/A.
7. Parts to be Inspected.
NOMENCLATURE
PART NUMBER
NSN
Coupling Half, 90-Degree
2Z2645
4730-01-322-4962
Coupling Half, Straight
2Z2646
4730-01-322-9863
8. Inspection Procedures.
a. Gain access to left side engine compartment. Locate the Oil Line (figure 98, item 172A) running
from the Engine to the ODDS Lubriclone Filter (left side of Engine on the firewall). Locate the Break-Away
Oil Coupling (90-degree and straight halves) at the ODDS Lubriclone Filter.
b. Loosen the B-nut on the Oil Line (figure 98, item 172A) and disconnect the Oil Line at The Straight
Coupling Half. Temporarily cap Oil Line to prevent contamination.
c. Measure the wear on the break-away pins using a feeler gage as follows:
NOTE
When attempting to measure the gap do not rock coupling halves back
and forth. Apply an even pressure so that a consistent reading
is obtained.
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