72-21-01 AERO COMMANDER DIVISION, NORTH AMERICAN ROCKWELL CORPORATION: Amdt. 39-1527. Applies to all Aero Commander (Intermountain) (CallAir) Models B-1 and B-1A series airplanes, S/N's 10,000 through 10,035.
Compliance required within the next 100 hours' time in service after the effective date of this AD, unless already accomplished.
To prevent failures of the landing gear shock struts, accomplish the following:
(a) Remove main landing gear shock struts, P/N 18004-1 (left hand) and P/N 18004- 2 (right hand) and discard struts and all hardware except the wire cutters, P/N 18026.
(b) Install replacement shock struts. P/N 18045-1 (left hand) and P/N 18045-2 (right hand). Attach these struts with the following hardware:
(1) Upper strut attachment (2 required per strut):
NAS 1306-26 Bolt
AN 960-616 Washer
AN 365-624 Nut
(2) Lower strut attachment (1 required per strut):
NAS 1306-38 Bolt
AN 960-616 Washer
AN 365-624 Nut(c) Replace the wire cutter, P/N 18026, on the new landing gear shock strut with two AN 3-6A bolts, two AN 960-10 washers, and two AN 365-1032 nuts. Repeat for the opposite strut.
Aero Commander Service Bulletin A-23 pertains to this same subject.
This amendment becomes effective October 6, 1972.