AD 85-19-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | BOEING Model 767, 757, 737 and 727 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | BOEING Model 767, 757, 737 and 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | BOEING Model 767, 757, 737 and 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | BOEING Model 767, 757, 737 and 727 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | BOEING Model 767, 757, 737 and 727 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | BOEING Model 767, 757, 737 and 727 Series Airplanes |
| aircraft | The Boeing Company | 737-100 Series | BOEING Model 767, 757, 737 and 727 Series Airplanes |
| aircraft | The Boeing Company | 737-200 Series | BOEING Model 767, 757, 737 and 727 Series Airplanes |
| aircraft | The Boeing Company | 737-200C Series | BOEING Model 767, 757, 737 and 727 Series Airplanes |
| aircraft | The Boeing Company | 737-300 Series | BOEING Model 767, 757, 737 and 727 Series Airplanes |
Unsafe Condition
Loose resolver and/or damper gears in Rosemount Model 861CAB (modification 0001) and 861CAK (modification 0001) AOA sensors may cause malfunctioning, leading to inaccurate angle of attack indications.
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Required Actions
Inspect AOA sensors at intervals not exceeding 300 flight hours or 30 days, whichever is later. Replace specific serial ranges (757/767: 00475-00629 within 180 days and 00001-00474 within 360 days; 727/737: 00001-00173 within 180 days) with modification 0001A units. Use specified service bulletins and rework per Rosemount instructions.
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Compliance Time
Within 180 or 360 days after October 12, 1985, depending on serial range. Inspections must be done within 300 flight hours or 30 days after AD effective date, whichever is later, and recurring intervals not exceeding 300 flight hours or 30 days.
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Affected Aircraft
Boeing Model 767, 757, 737, and 727 series airplanes equipped with Rosemount AOA sensors Model 861CAB (mod 0001) or 861CAK (mod 0001).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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