63-22-02 GRUMMAN: Amdt. 634 Part 507 Federal Register October 26, 1963. Applies Only to Model G-164 Series Aircraft Equipped With Continental W670 Series Engines, Serial Numbers 1 through 229 Inclusive.
Compliance required as indicated.
As a result of excessive wear of the throttle control pivot bolt, which can cause loss of throttle control, accomplish the following:
(a) (1) Within 25 hours' time in service after the effective date of this AD, remove and visually inspect the throttle control pivot bolt (AN 23-13) for wear. If the bolt is worn, measure bolt shank. (2) If wear in excess of 0.020 inch is detected on any surface of the bolt, rework the carburetor throttle arm for a 0.250 diameter reamed hole, and installation of an A1658-1 bushing, AN 3-10A bolt, AN 960-10 washers and AN 365-1032 self-locking nut per Grumman Service Bulletin No. 25 dated August 29, 1963. (Grumman Engineering Change Order No. S164-1292.)
(3) If no wear is found on the AN 23-13 bolt, thepivot bolt may be continued in service provided that the bolt is repetitively inspected at intervals of 50 hours' time in service.
(b) Repetitive inspections required by (a) (3) may be discontinued when the modifications established by a (a)(2) are accomplished.
(Grumman Service Bulletin No. 25 dated August 29, 1963, with enclosure (a) Grumman Engineering Change Order No. S164-1292 covers this same subject.)
This directive effective October 26, 1963.