ONE TIME INSPECTION OF MAIN ROTOR HUB ASSEMBLY ALL H--60 AIRCRAFT

URGENT

*TB 1--1520--237--20--215

DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

ONE TIME INSPECTION OF

MAIN ROTOR HUB ASSEMBLY

ALL H--60 AIRCRAFT

Headquarters, Department of the Army, Washington, D. C.

22 November 1999

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

NOTE

THIS PUBLICATION IS EFFECTIVE UNTIL RESCINDED OR SUPERSEDED.

Priority Classification.

Urgent

a. Aircraft in Use. Same as TB 1--1520--237--20--212 and (UH--60--99--ASAM--07).

b. Aircraft in Depot Maintenance. Same as TB 1--1520--237--20--212 and (UH--60--99--ASAM--07).

Aircraft Undergoing Maintenance. Same as TB 1--1520--237--20--212 and (UH--60--99--ASAM--07).

d. Aircraft in Transit. Same as TB 1--1520--237--20--212 and (UH--60--99--ASAM--07).

e. Maintenance Trainers (Category A, and B). Same as TB 1--1520--237--20--212 and

(UH--60--99--ASAM--07).

Component/Parts in Stock at All Levels (Depot and Others) Including War Reserves. N/A.

g. Component/Parts In Work (Depot Levels and Others). N/A.

Task/Inspection Suspense Date. N/A.

3. Reporting Compliance Suspense Date. No later than 3 December 1999 per paragraph 14.a of

this TB.

Summary of the Problem.

a. UH--60--99--ASAM--07) imposed a non--destructive inspection (NDI) of the eleven o'clock dampener

bracket attachment bolt hole on the inside surface of the Main Rotor Hub every 100 hours on hubs with over

1,000 flight hours. Subsequent test and analysis revealed that a longer interval between inspections would

not degrade safety or airworthiness. This revision to the ASAM increases the internal between required in-

spection from 100 flight hours to 200 flight hours.

b. For manpower/downtime and funding impacts, see paragraph 12.

*This TB supersedes USAAMCOM Aviation Safety Action Message 101310Z NOV 99, UH--60--00--ASAM--01