61-22-04 CONVAIR: Amdt. 352 Part 507 Federal Register October 21, 1961. Applies to All Model 22 (880) Aircraft.
Compliance required as indicated.
Reinspection of the pressurization system indicates that under certain conditions a single malfunction in the pressurization static system could cause the aircraft to be pressurized beyond the structural limits. To provide the required level of safety, the following, or FAA approved equivalent shall be accomplished within the next 250 hours' time in service after effective date of this AD:
(a) Rework existing static system to provide either
(1) A separate static sensing source for each cabin outflow valve, or
(2) A static sensing source common to the two outflow valves and a separate static sensing source for the cabin pressure controller.
(Convair Service Bulletin No. 21-23 dated March 25, 1961, covers the same subject.)
This directive effective November 21, 1961.