AD 58-13-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Martin Aeronautics Company | 1649A-98 | LOCKHEED Model 1649A Aircraft |
Unsafe Condition
Possible hazardous wing bending oscillation dynamically induced by aileron oscillation under certain combinations of boost package tolerances and autopilot modulating piston follow-up failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a new modulating piston stop to meet aileron deflection rate limits of 7.5 degrees per second minimum and 11 degrees per second maximum. Reidentify the valve as 668152-11 and paint it yellow to denote noninterchangeability with elevator and rudder valves. Follow details in Lockheed communication FS/225805-W dated June 13, 1958.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
As soon as maintenance schedules permit but not later than January 1, 1959.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Lockheed Model 1649A aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.