DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
MAIN ROTOR SHAFT EXTENSION ASSEMBLY
(ALL H-60 AIRCRAFT)
Headquarters, Department of the Army, Washington, D. C.
31 January 1997
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
THIS PUBLICATION IS EFFECTIVE UNTIL RESCINDED
1. Priority Classification.
a. Aircraft in Use. Upon receipt of this Technical Bulletin (TB), the condition status symbol of cited aircraft will be
changed to a red horizontal dash "-". The red horizontal dash -" may be cleared when the inspection of paragraph 8
below is completed. The affected aircraft shall be inspected as soon as practical but no later than the task/inspection
suspense date. Failure to comply with the requirements of this TB within the applicable time frame will cause the status
symbol to be upgraded to a red "X".
b. Aircraft in Depot Maintenance. Same as paragraph 1 a.
c. Aircraft Undergoing Maintenance. Same as paragraph 1 a.
e. Maintenance Trainers (Category A and B). Same as paragraph 1 a.
f. Component/Parts in Stock Including War Reserves at All Levels (Depot and Others).
(1) All items listed in paragraphs 8 below having 2100 hours or more total time shall be placed in condition
code "D" and retagged with a DD Form 1575/1575-1 (brown color) and held pending test results. The authority block
must reference this TB (TB 1-1520-237-20-190) (TB 1-1520-250-20-15). All other items listed in para 8 with less than
2100 hours shall be placed in condition code "D" and tagged with DD Form 1576/1576-1 (color blue). The authority block
shall have the following annotation made interim life of 2100 hours assigned and reference this TB (TB 1-1520-237-20-
190) (TB 1-1520-250-20-15).
(2) Wholesale Stock. N/A.
*This TB supersedes USAATCOM Aviation Safety Action Message 221453Z JAN 97, UH-60-97-ASAM-09.