73-09-06 PIPER: Amendment 39-1631. Applies to Model PA-22-150, PA-22S-150, PA-22-160 and PA-22S-160 aircraft equipped with Lycoming O-320 series engines and Marvel Schebler Carburetors Model MA-4-SPA, Part Numbers 10-3678-11, 10-3678-12, 10-3678-32, and to other PA-22 type aircraft which have been modified to these engine/carburetor configurations.
Compliance required within the next 10 hours in service after the effective date of this AD, unless already accomplished.
To prevent power interruption and acceleration hangup resulting from abrupt throttle movement, accomplish the following:
Attach the following operating limitation placard to the instrument panel near the throttle in full view of the pilot. Use 1/8 inch min. size lettering.
"DO NOT OPEN THROTTLE RAPIDLY -
(IDLE TO FULL THROTTLE, 2 SECONDS MINIMUM)"
The placard may be fabricated by the owner or operator.
This amendment is effective May 7, 1973.