84-01-02 R1 HUGHES HELICOPTERS, INC. (HUGHES HELICOPTERS): Amendment 39-4831. Applies to Hughes Helicopters, Inc., Model 369 series including Army YOH-6A, and OH6A helicopters certificated in all categories.
Compliance is required prior to further flight, unless already accomplished.
To prevent possible loss of control of rotor system in flight, accomplish the following:
For Hughes Helicopters, Inc., Model 369 (Army YOH-6A), 369A (Army OH-6A) D, E, H, HE, HM, and HS helicopters with swashplate bearing assembly P/N 369A7OO3-3 installed after June 1, 1983;
(a) Comply with paragraphs A through J of procedures section of Hughes Helicopters, Inc., Mandatory Service Information Notices DN-125, EN-12, and HN-191, as applicable, all dated December 23, 1983, or FAA approved equivalent. Model 369 series are to comply with Mandatory Service Information Notice HN-191 or FAA approved equivalent.
(b) Replace deficient swashplate bearing assembly with serviceable unit.(c) Swashplate bearing assembly P/N 369A7003-3 with positively identified serial numbers 9000 through 9999 or with a 1/8-inch-diameter blue dot on the outer surface of the snap ring has been determined to contain the ball bearing cage and need not be reinspected.
(d) Only subject bearing assembly positively identified as being S/Ns 9000-9999 or bearing assemblies with blue dot on the outer surface of snap ring or FAA approved equivalent bearing assemblies approved by the Manager, Western Aircraft Certification Office may be used as replacement swashplate bearing assemblies.
Alternative inspections, modifications, or other actions which provide an equivalent level of safety may be used when approved by the Manager, Western Aircraft Certification Office, Hawthorne, California.
This amendment becomes effective April 9, 1984, as to all persons except those persons to whom it was made immediately effective by priority mail AD 84-01-02, issued January 10, 1984, which contained this amendment.