TB 1-1520-238-20-68
e. Maintenance Trainers (Category A, B). Same as paragraph 1.a above.
f. Component/Parts in Stock Including War Reserves at All Levels (Depot and Others). N/A
g. Aircraft Undergoing Test: Aircraft serial numbers84-24273, 83-23814, 83-23818, are not affected by this message.
(1) Retail Stock. N/A
(2) Wholesale Stock N/A
2. Task/inspection Suspense Date. within 10 hours/14 days.
3. Reporting Compliance Suspense Date. No
later than 26
October 1995 per paragraph 14.a of
this TB.
4. Summary of the Problem.
a. A recent failure has been attributed to the chafing of hose damp P/N HS4501SS09NB on hose P/N 7-311830102-
5, (Primary Hydraulic Pressure Line). The hose was chafed completely through and hydraulic pressure was lost during
approach to landing. The hose clamp was too large since it had been sized for the previous hose which had a braided
sleeve.
c. The purpose of this TB is to replace the hose clamp P/N HS5401SS09NB with hose clamp P/N M85052/1-7 band
and to inspect the primary pressure line P/N 7-311830102-5 for chaffng and damaged braid.
5. End Items to be inspected. All AH-64 Aircraft.
6. Assembly Components to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
Hose Clamp
HS4501SS09NB
5340-01-296 6545
Hydraulic Hose
7-311830102-5
7. Parts to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
Hose Clamp
HS4501SS09NB
5340-01-296 6545
Hydraulic Hose
7-311830102-5
8. Inspection Procedures.
a. Aircraft to be inspected must be in compliance with MWO 55-1520-238-50-7 and have P/N 7-311830102-5
installed. Aircraft not in compliance with MWO 55-1520-238-50-7 and have hose P/N 7-311830101-7 should contact the
logical point of contact. Aircraft not in compliance with MWO 55-1520-238-50-7 are not affected by this message.
Aircraft at Ft. Rucker S/N 84-24273, 83-23814, 83-23818 are equipped with prototype hydraulic hose and are not
affected by this message.
b. Inspect hydraulic hose, 7-311830102-5, for damage and chafing, none allowed. If hose is discrepant, proceed to
9. Correction Procedures. Replace hydraulic hose, P/N 7-311830102-5, per reference 13a., paragraph 7.5. Do
not
reuse hose clamp, P/N M85052/1-7.
2