AD 76-17-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | BOEING Model 727-100 Series Airplanes |
Unsafe Condition
Loss of altitude and airspeed reference due to water freezing in the static port system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Reactivate static port heater circuits to original FAA-approved configuration within 1,000 hours time in service, or replace heater assembly P/N 10-60723-1 with elbow fitting MS21908D6 and enlarge static port sensing holes from 0.047 inch to 0.125 inch diameter within 2,000 hours time in service. Equivalent modifications may be approved.
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Compliance Time
Within the next 1,000 hours time in service after the effective date of this AD (October 1, 1976) for option (1), or within the next 2,000 hours time in service after the effective date for option (2).
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Affected Aircraft
Boeing Model 727-100 series airplanes certificated in all categories with static port heater circuits deactivated.
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
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