AD Amdt-39-9494
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing | Models 727 | Airworthiness Directives; Boeing Models 727, 737, and 747 Series Airplanes; McDonnell Douglas Model DC-8 and DC-9 Series Airplanes, Model MD-88 Airplanes, and Models MD-11 and MD-90-30 Series Airplanes; Lockheed Models L-1011-385 Series Airplanes; Fokker Models F28 Mark 1000, 2000, 3000, 4000, and 0100 Series Airplanes; and British Aerospace Model Avro 146-RJ Series Airplanes |
| aircraft | Fokker | Models F28 Mark 1000 | Airworthiness Directives; Boeing Models 727, 737, and 747 Series Airplanes; McDonnell Douglas Model DC-8 and DC-9 Series Airplanes, Model MD-88 Airplanes, and Models MD-11 and MD-90-30 Series Airplanes; Lockheed Models L-1011-385 Series Airplanes; Fokker Models F28 Mark 1000, 2000, 3000, 4000, and 0100 Series Airplanes; and British Aerospace Model Avro 146-RJ Series Airplanes |
| aircraft | Lockheed | Models L-1011-385 | Airworthiness Directives; Boeing Models 727, 737, and 747 Series Airplanes; McDonnell Douglas Model DC-8 and DC-9 Series Airplanes, Model MD-88 Airplanes, and Models MD-11 and MD-90-30 Series Airplanes; Lockheed Models L-1011-385 Series Airplanes; Fokker Models F28 Mark 1000, 2000, 3000, 4000, and 0100 Series Airplanes; and British Aerospace Model Avro 146-RJ Series Airplanes |
| aircraft | McDonnell Douglas | DC-8 and DC-9 | Airworthiness Directives; Boeing Models 727, 737, and 747 Series Airplanes; McDonnell Douglas Model DC-8 and DC-9 Series Airplanes, Model MD-88 Airplanes, and Models MD-11 and MD-90-30 Series Airplanes; Lockheed Models L-1011-385 Series Airplanes; Fokker Models F28 Mark 1000, 2000, 3000, 4000, and 0100 Series Airplanes; and British Aerospace Model Avro 146-RJ Series Airplanes |
Unsafe Condition
The Honeywell Standard Windshear Detection System (WSS) may experience significant delays in detecting windshear when the flaps are in transition, potentially leading to loss of flight path control.
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Required Actions
Replace the currently installed line replaceable unit (LRU) with a modified LRU containing new software to eliminate delays in WSS detection during flap transitions. Revise the FAA-approved Airplane Flight Manual (AFM) as specified.
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Compliance Time
Before further flight
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Affected Aircraft
Airplanes equipped with certain Honeywell Standard Windshear Detection Systems (WSS), including models from Boeing, McDonnell Douglas, Lockheed, Fokker, and British Aerospace as listed in the AD.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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