AD 2003-11-19
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | 727-100 and 727-200 | Airworthiness Directives; Boeing Model 727-100 and 727-200 Series Airplanes |
Unsafe Condition
Improper autopilot desensitization rate during coupled ILS approaches can lead to undesirable and potentially dangerous pitch oscillations.
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Required Actions
Replace the installed autopilot pitch control computer with a modified computer, test the modified system, and revise the Airplane Flight Manual (AFM) to include data regarding certain limitations, such as autopilot disconnect, inherent in the design of Sperry SP-50 and SP-150 autopilots.
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Compliance Time
Before further flight
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Affected Aircraft
Boeing Model 727-100 and 727-200 series airplanes equipped with Sperry SP-50 and SP-150 autopilots, excluding those with radio altimeter-based glideslope gain programming.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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