77-15-13 HAWKER SIDDELEY AVIATION, LTD: Amendment 39-2983. Applies to Model DH-114 airplanes certificated in all categories.
Compliance is required within the next 300 hours time in service after the effective date of this AD, unless already accomplished.
To prevent the possible seizure of the main landing gear damper ram, and consequent damage to the aircraft upon landing, accomplish the following:
(a) Modify the damper ram, P/N AC11164, in accordance with Part A of the section entitled "Accomplishment Instructions" of Dunlop Aviation Division Service Bulletin 32-824, dated April 5, 1973, or an FAA-approved equivalent.
(b) Upon completion of the modification specified in paragraph (a) of this AD, reidentify the modified damper ram as P/N AC65528, Mod. 1. (Hawker Siddeley Aviation, Ltd., Series: Heron (114), TNS. U.15, Issue 2, dated April 30, 1973, refers to this same subject.)
This amendment becomes effective August 24, 1977.