81-24-09 LOCKHEED-CALIFORNIA COMPANY: Amendment 39-4267. Applies to Lockheed Model 188A and 188C Series airplanes, certificated in all categories.
Compliance required within 30 days after the effective date of this AD, unless already accomplished.
To prevent a reduction in performance which could result in a hazardous condition, incorporate in the Limitations Section of the FAA-Approved Airplane Flight Manual a revision which specifies that all takeoffs and approaches must be performed with the synchronization control in the following position:
For Hamilton Standard Propellers -
SYNC MASTER switch-OFF
For Aeroproducts Propellers -
Synchronizer switch-SYNCH OFF.
This amendment becomes effective December 28, 1981.